CORD-19:3345fa1a77d9ad2f4bce48138490e60a462fe18b JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/CORD-19/sourceid/3345fa1a77d9ad2f4bce48138490e60a462fe18b","sourcedb":"CORD-19","sourceid":"3345fa1a77d9ad2f4bce48138490e60a462fe18b","text":"Sugar-Binding Profiles of Chitin-Binding Lectins from the Hevein Family: A Comprehensive Study\n\nAbstract\nChitin-binding lectins form the hevein family in plants, which are defined by the presence of single or multiple structurally conserved GlcNAc (N-acetylglucosamine)-binding domains. Although they have been used as probes for chito-oligosaccharides, their detailed specificities remain to be investigated. In this study, we analyzed six chitin-binding lectins, DSA, LEL, PWM, STL, UDA, and WGA, by quantitative frontal affinity chromatography. Some novel features were evident: WGA showed almost comparable affinity for pyridylaminated chitotriose and chitotetraose, while LEL and UDA showed much weaker affinity, and DSA, PWM, and STL had no substantial affinity for the former. WGA showed selective affinity for hybrid-type N-glycans harboring a bisecting GlcNAc residue. UDA showed extensive binding to high-mannose type N-glycans, with affinity increasing with the number of Man residues. DSA showed the highest affinity for highly branched N-glycans consisting of type II LacNAc (N-acetyllactosamine). Further, multivalent features of these lectins were investigated by using glycoconjugate and lectin microarrays. The lectins showed substantial binding to immobilized LacNAc as well as chito-oligosaccharides, although the extents to which they bound varied among them. WGA showed strong binding to heavily sialylated glycoproteins. The above observations will help interpret lectin-glycoprotein interactions in histochemical studies and glyco-biomarker investigations.\nwell as disulfide bridges (Figure 1) . Hevein was originally found in latex from rubber as a component of chitinase in 1970. Although hevein is known to show relatively weak (i.e., 1 mM or lower K d ) affinity for chito-oligosaccharides [12] [13] [14] , other chitin-binding lectins have multiple carbohydrate-binding domains and their amino acid sequences are significantly different, including the conserved aromatic residues involved in GlcNAc recognition (Figure 1) . Int. J. Mol. Sci. 2017, 18, x 2 of 26 consisting of 43 amino acids (hevein domain), including evolutionarily conserved serine and aromatic residues as well as disulfide bridges (Figure 1) . Hevein was originally found in latex from rubber as a component of chitinase in 1970. Although hevein is known to show relatively weak (i.e., 1 mM or lower Kd) affinity for chito-oligosaccharides [12] [13] [14] , other chitin-binding lectins have multiple carbohydrate-binding domains and their amino acid sequences are significantly different, including the conserved aromatic residues involved in GlcNAc recognition (Figure 1 ).\n\nHistorically, plant lectins have been characterized as hemagglutinin-or mitogen-acting toward animal cells (e.g., Griffonia simplicifolia lectin I (GSL-I) A4 hemagglutinin specific for blood type group A [1] [2] [3] and the plant toxin ricin known as Ricinus communis agglutinin II (RCA60) [4] [5] [6] ). Plant lectins exist as multiple molecular species (i.e., isolectins such as Ricinus communis agglutinin I (RCA120), RCA60, GSL-I A4, and GSL-I B4 [1, [7] [8] [9] [10] [11] ). These plant lectins have long been utilized in the glycoscience field, especially when no methods are available other than anti-glycan antibodies. Therefore, knowledge about glycan-binding properties is crucial to interpret the results obtained by their use.\nChitin-binding lectins constitute members of the hevein-like lectin family (hereafter referred to as the hevein family), where hevein corresponds to a sole proto-type member of the family, consisting of 43 amino acids (hevein domain), including evolutionarily conserved serine and aromatic residues as Figure 1 . Alignment of amino-acid sequences of the six chitin-binding lectins investigated in this work. Hevein, constituting a sole proto-type lectin, is shown as a reference. The sequences are of UDA6 isolectin (GenBank/EMBL/DDBJ accession number AAD05433) for UDA, PLC isolectin (AB052963) for PWM, WGA1 isolectin (UniProtKB accession number, P10968) for WGA (categorized as tandem-repeat type), LEL (AB360604), DSA-B isolectins (AB618634) for DSA, and STL (Q9S8M0; categorized as chimera type). Bold arrows on the top denote the regions of β-strands. Schematic representations are made for each lectin on the right, where four amino-acid residues essential for chito-oligosaccharide-binding in hevein, i.e., Ser (S), two Trp (W), and Tyr (Y) are shown in each hevein domain shown with a gray box. The extensin-like, function-unknown domain is shown with a black bar.\nVan Damme has proposed the categorization of the known plant lectins, including chitin-binding lectins, into three groups: merolectin, horolectin, and chimerolectin. Further, superlectin was designated as a special group of chimerolectin [15] . This classification is analogous to that of galectins forming a large group of animal lectins (e.g., \"proto type\" consisting of a single carbohydrate-recognition domain (CRD) such as galectin-1, 2 and 7, \"tandem-repeat type\" consisting of multiple CRDs such as galectin-4, 8 and 9, and \"chimera type\" consisting of a CRD and a non-CRD structural domain such as galectin-3 [16] ). With regard to the binding specificity of chitin-binding lectins, WGA is known to bind heavily sialylated glycans [17, 18] and tomato lectin (LEL) preferentially binds to repeated structures of N-acetyllactosamine (poly-LacNAc) [19, 20] . However, details of the glycan-binding specificity of these chitin-binding lectins are not known, even though they are well-known plant lectins.\nIn this study, six chitin-binding lectins, Datura stramonium agglutinin (DSA), Lycopersicon esculentum (currently renamed Solanum lycopersicum) lectin (LEL; tomato lectin), Phytolacca americana mitogen (PWM; pokeweed mitogen), Solanum tuberosum lectin (STL; potato lectin), Urtica dioica agglutinin (UDA), and Triticum vulgaris agglutinin (WGA; wheat germ agglutinin), belonging to the hevein family, were investigated for their glycan-binding properties. WGA is extensively used as a Van Damme has proposed the categorization of the known plant lectins, including chitin-binding lectins, into three groups: merolectin, horolectin, and chimerolectin. Further, superlectin was designated as a special group of chimerolectin [15] . This classification is analogous to that of galectins forming a large group of animal lectins (e.g., \"proto type\" consisting of a single carbohydrate-recognition domain (CRD) such as galectin-1, 2 and 7, \"tandem-repeat type\" consisting of multiple CRDs such as galectin-4, 8 and 9, and \"chimera type\" consisting of a CRD and a non-CRD structural domain such as galectin-3 [16] ). With regard to the binding specificity of chitin-binding lectins, WGA is known to bind heavily sialylated glycans [17, 18] and tomato lectin (LEL) preferentially binds to repeated structures of N-acetyllactosamine (poly-LacNAc) [19, 20] . However, details of the glycan-binding specificity of these chitin-binding lectins are not known, even though they are well-known plant lectins.\nIn this study, six chitin-binding lectins, Datura stramonium agglutinin (DSA), Lycopersicon esculentum (currently renamed Solanum lycopersicum) lectin (LEL; tomato lectin), Phytolacca americana mitogen (PWM; pokeweed mitogen), Solanum tuberosum lectin (STL; potato lectin), Urtica dioica agglutinin (UDA), and Triticum vulgaris agglutinin (WGA; wheat germ agglutinin), belonging to the hevein family, were investigated for their glycan-binding properties. WGA is extensively used as a probe to stain cell membranes [21, 22] . LEL is also used for histochemical staining of the vascular endothelium [23, 24] .\nOther lectins are also used as probes to stain animal tissue sections [25, 26] . WGA isolated from the germ of wheat (Gramineae) is a tandem-repeat type lectin consisting of four hevein domains of homo or hetero dimers [27] [28] [29] [30] [31] [32] . As shown by Yamaguchi et al. and Hayashida et al. [14, [33] [34] [35] , PWM isolated from the root of pokeweed (Phytolaccaceae) also belongs to a tandem-repeat type, existing as a dimer. UDA isolated from the rhizome of stinging nettle (Urticaceae) is also a tandem-repeat type lectin, consisting of two hevein domains [36] [37] [38] . In contrast, STL isolated from the plant tuber potato and DSA isolated from the seed of thornapple (Solanaceae) are more complex and categorized as a chimera-type lectin, both of which contain four hevein domain repeats and an extensin-like domain, the latter of which is located between two N-terminal hevein domains and two C-terminal domains, the function of which is not known [39] [40] [41] [42] [43] . LEL isolated from the fruit of tomato (Solanaceae) also belongs to a chimera-type lectin, comprised of a single and three hevein domain repeats in the N-and C-terminus of the dimer, respectively, and an extensin-like domain in between, unlike STL and DSA [44, 45] (Figure 1) .\nWe analyzed the glycan-binding properties of the six chitin-binding lectins for 124 pyridylaminated (PA) oligosaccharides by quantitative frontal affinity chromatography (FAC) [46] [47] [48] , where lectins are immobilized. Comparative analysis of the six lectins were also conducted using a glycoconjugate microarray, where a series of glycoconjugates consisting of glycoproteins and synthetic glycans conjugated to polyacrylamide (PAA), are immobilized on a glass slide [49] . Further analysis by a lectin microarray, where 43 commercial lectins, including the six chitin-binding lectins, are immobilized [50, 51] , was performed by probing with a serum glycoprotein, fetuin (FET), both before and after sialidase treatment to examine how the signal patterns are changed on the chitin-binding lectins. The observed results are extremely informative and, thus, they will help interpret lectin-glycoprotein interactions in a variety of histochemical research fields and glyco-biomarker investigations.\nThe overall strategy in this work of analyzing six chitin-binding lectins used the following three approaches: (1) binding affinities between the six lectins and a panel of PA-oligosaccharides were determined in terms of dissociation constant (K d ) by FAC and based on the FAC results;\n(2) their actual binding to immobilized glycans was analyzed using a glycoconjugate microarray, wherein 96 glycoconjugates consisting of serially glycosidase-treated glycoproteins and polymer-based multivalent synthetic glycans were immobilized; and (3) effects of desialylation were examined with a model serum glycoprotein, FET, on a lectin microarray platform, wherein 43 commercial lectins, including the six chitin-binding lectins, were immobilized.\nFor systematic comparison of sugar-binding properties of the six chitin-binding lectins, FAC was carried out with a previously established procedure [9, 48, 52] . Briefly, to determine the K d values of each of the six chitin-binding lectins for 124 PA-oligosaccharides, each of the lectins was immobilized on activated Sepharose at several concentrations: one for concentration-dependent analysis to determine the effective ligand content B t (expressed in nmol) of a standard column, from which K d values for a panel of PA-oligosaccharides were determined according to a simplified basic equation of FAC,\n. The other(s) are supplementary to cover a wide range of possible K d values, which is in direct relation to the observed value of V − V 0 (for more detail, see Materials and Methods).\nIn this work, B t was determined for each column using an appropriate p-nitrophenyl (pNP)-saccharide, which showed significant affinity with sufficient retardations (\u003e25 µL). Concentration-dependent analysis showed that B t values were 1.12, 0.74, 0.11, 1.58, 1.10, 6.10, and 5.55 nmol for DSA, LEL, LEL (supplementary), PWM, STL, UDA, and WGA columns, respectively (Table 1) . From these data, K d values were derived to be 33 µM for DSA and chitotetraose-β-pNP, 7.9 µM for LEL and LacNAc-β-pNP, 4.6 µM for LEL and chitopentaose-β-pNP, 42 µM for PWM and chitopentaose-β-pNP, 31 µM for STL and chitopentaose-β-pNP, 48 µM for UDA and LacNAc-β-pNP and 57 µM for WGA and LacNAc-β-pNP ( Figure 2 ). \nBased on the above results, Kd values were subsequently determined for a panel of PA-oligosaccharides ( Figure 3 ). Hereafter, FAC data are expressed in terms of affinity constant Ka (1/Kd) in the bar graphs in Figure 4 , while they are discussed in terms of Kd (μM) throughout the text (also see Table S1 ). \nBased on the above results, K d values were subsequently determined for a panel of PA-oligosaccharides ( Figure 3 ). Hereafter, FAC data are expressed in terms of affinity constant K a (1/K d ) in the bar graphs in Figure 4 , while they are discussed in terms of K d (µM) throughout the text (also see Table S1 ). Complex-type (sialo) Carbohydrate structures are expressed using symbols according to the rules defined by the Consortium for Glycomics (CFG; http://www.functionalglycomics.org/static/consortium/Nomenclature.shtml) with further modification to specify linkage and anomeric types: position 1, is placed at the right side, and numbering proceeds clockwise. Thin and thick bars represent α-and β-linkages, respectively.\nAs has been previously reported in studies of chitin-binding lectins [40, [53] [54] [55] [56] [57] [58] [59] [60] , LEL, PWM, STL, UDA, and WGA showed high affinity, while DSA showed low affinity for chito-oligosaccharides (indicated by numbers 906 and 907 in the figures). However, the determined Kd values varied considerably among the six lectins. Those determined for PA-chitotetrasaccharide (907; note that reducing terminal GlcNAc takes an open form as a result of pyridylamination and, thus, may not contribute to full recognition in some lectins) were 43 (DSA), 0.64 (LEL), 53 (PWM), 12 (STL), 3.8 UDA), and 4.1 μM (WGA). On the other hand, DSA, PWM, and STL did not show detectable affinity for chitotriose (906), while the Kd value of WGA was almost the same as that for chitotetraose. Notably, observed affinities of DSA for these chito-oligosaccharides were relatively low compared with other oligosaccharides to which DSA binds, such as branched N-glycans (323 and 418). In this context, DSA is unique in that it showed significant affinity for a series of oligo-α1-4-glucose, (Glcα1-4)3-7 (908, 927-930). However, their affinities were almost the same regardless of the chain length, unlike other oligomers (described in detail below). Carbohydrate structures are expressed using symbols according to the rules defined by the Consortium for Glycomics (CFG; http://www.functionalglycomics.org/static/consortium/Nomenclature.shtml) with further modification to specify linkage and anomeric types: position 1, is placed at the right side, and numbering proceeds clockwise. Thin and thick bars represent αand β-linkages, respectively.\nAs has been previously reported in studies of chitin-binding lectins [40, [53] [54] [55] [56] [57] [58] [59] [60] , LEL, PWM, STL, UDA, and WGA showed high affinity, while DSA showed low affinity for chito-oligosaccharides (indicated by numbers 906 and 907 in the figures). However, the determined K d values varied considerably among the six lectins. Those determined for PA-chitotetrasaccharide (907; note that reducing terminal GlcNAc takes an open form as a result of pyridylamination and, thus, may not contribute to full recognition in some lectins) were 43 (DSA), 0.64 (LEL), 53 (PWM), 12 (STL), 3.8 UDA), and 4.1 µM (WGA). On the other hand, DSA, PWM, and STL did not show detectable affinity for chitotriose (906), while the K d value of WGA was almost the same as that for chitotetraose. Notably, observed affinities of DSA for these chito-oligosaccharides were relatively low compared with other oligosaccharides to which DSA binds, such as branched N-glycans (323 and 418). In this context, DSA is unique in that it showed significant affinity for a series of oligo-α1-4-glucose, (Glcα1-4) 3-7 (908, 927-930). However, their affinities were almost the same regardless of the chain length, unlike other oligomers (described in detail below). 004 005 006 007 008 009 010 011 012 013 014 015 016 017 052 101 102 103 104 105 107 108 201 202 203 301 302 304 305 307 308 313 314 323 401 402 403 404 405 406 410 418 419 420 501 502 503 504 506 601 602 701 702 703 704 705 706 707 708 709 710 711 712 713 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 901 902 903 905 906 907 908 909 910 911 913 914 915 918 919 920 921 927 928 929 930 936 004 005 006 007 008 009 010 011 012 013 014 015 016 017 052 101 102 103 104 105 107 108 201 202 203 301 302 304 305 307 308 313 314 323 401 402 403 404 405 406 410 418 419 420 501 502 503 504 506 601 602 701 702 703 704 705 706 707 708 709 710 711 712 713 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 901 902 903 905 906 907 908 909 910 911 913 914 915 918 919 920 921 927 928 929 930 936 004 005 006 007 008 009 010 011 012 013 014 015 016 017 052 101 102 103 104 105 107 108 201 202 203 301 302 304 305 307 308 313 314 323 401 402 403 404 405 406 410 418 419 420 501 502 503 504 506 601 602 701 702 703 704 705 706 707 708 709 710 711 712 713 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 901 902 903 905 906 907 908 909 910 911 913 914 915 918 919 920 921 927 928 929 930 936 004 005 006 007 008 009 010 011 012 013 014 015 016 017 052 101 102 103 104 105 107 108 201 202 203 301 302 304 305 307 308 313 314 323 401 402 403 404 405 406 410 418 419 420 501 502 503 504 506 601 602 701 702 703 704 705 706 707 708 709 710 711 712 713 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 901 902 903 905 906 907 908 909 910 911 913 914 915 918 919 920 921 927 928 929 930 936 003 004 005 006 007 008 009 010 011 012 013 014 015 016 017 052 101 102 103 104 105 107 108 201 202 203 301 302 304 305 307 308 313 314 323 401 402 403 404 405 406 410 418 419 420 501 502 503 504 506 601 602 701 702 703 704 705 706 707 708 709 710 711 712 713 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 901 902 903 905 906 907 908 909 910 911 913 914 915 918 919 920 921 927 928 929 930 936 937 I II III IV V Figure 3 , whereas the Roman numerals at the top represent types of glycans, i.e., high-mannose-type (I), agalacto-type (II), asialo-type (III), sialo-type (IV) N-glycans, glycolipid-type glycans (V), and others (VI). For oligosaccharide structures and specifications of the lectin columns, see Figure 3 and Table 1 (43 µM) . It was also evident that Lewis-type fucosylation abolished DSA binding to type II LacNAc by comparison between triantennary 313 and 419 (N.D.), and between tetraantennary 323 (4.0 µM) and 420 (5.2 µM), though the effect of Le x inclusion was less dominant in the latter. This feature was more evident for glycolipid-type glycans 724 (LNnT, 91 µM) vs. 726 (Le x , N.D.). DSA affinity appeared to be attributed to the number of intact type II LacNAc units.\nConversely, core (α1-6) fucosylation did not substantially affect the affinity (410, 22 µM and 418, 4.1 µM compared with 313, 21 µM and 323, 4.0 µM, respectively). This result clearly indicates that DSA does not bind to the non-reducing terminal chitobiose structure, likely because the structure does not fulfill the minimal requirement for DSA recognition. Though the affinity is relatively low, DSA showed selective binding to high-mannose-type N-glycans 010 (60 µM) and 011 (56 µM).\nAs has already been reported, both DSA and LEL show significant affinity for poly-LacNAc [19, 20, [61] [62] [63] . However, as noted above, LEL showed much stronger affinity for both chito-oligosaccharides (906 and 907) and oligo-LacNAc (901, 902, 903, and 905) than DSA. When the affinities of LEL for 901, 902, 903, and 905 were compared, it was evident that LEL affinity increased with the increasing number of LacNAc units: 901 (N.D.) \u003c 902 (39 µM) \u003c 903 (10 µM) \u003c 905 (2.9 µM). DSA showed a similar tendency, but affinities to these oligo-LacNAc structures are relatively low; i.e., 901 (87 µM) \u003c 902 (48 µM) \u003c 903 (43 µM) \u003c 905 (17 µM). Thus, LEL appears to work as a good probe for detecting oligo-or poly-LacNAc chains in N-, O-glycans, or glycolipids. On the other hand, affinities for these oligosaccharides were low for WGA and UDA, and not detectable for PWM and STL, though previous papers report that PWM bound to poly-LacNAc chains with a GlcNAcβ1-6Gal branched structure, which is the result of I-GlcNAc transferase action [64] .\nLike DSA, LEL showed an apparent preference for type II LacNAc structure by comparison of branched glycolipid-type structures, i.e., 733 (6.7 µM) \u003c 734 (3.5 µM). Intriguingly, the lectin did not bind to other branched glycans such as 323 and 418, to which DSA has the highest binding affinity. Therefore, their recognition mechanisms substantially differ from each other at a molecular level.\nAmong the chitin-binding lectins tested, STL showed the simplest profile of high affinity to only chitotetraose (907, 12 µM). Significant binding was also found for other oligosaccharides, 307 (210 µM), 733 (130 µM), and 734 (220 µM), although the affinities were relatively low. When type I and type II LacNAc structures were compared; i.e., 733 vs. 734, affinities for these glycolipids-type oligosaccharides were almost the same, with affinity for type I being slightly higher. As is described later, STL showed selective affinity for a LacdiNAc (GalNAcβ1-4GlcNAc) structure when analyzed by glycoconjugate microarray, although the FAC assay did not generate corroborating evidence for this because of the lack of appropriate PA-oligosaccharides.\nAs shown in Figure 4 and Table S1 , binding affinity of PWM is lowest among the tested chitin-binding lectins. In fact, the K d for PA-chitotetraose (907), for which PWM showed the highest affinity, is 53 µM, which is 83 times weaker than LEL. However, PWM showed substantial affinity for glycolipid-type glycans 733 and 734. As found in the case for DSA and LEL, PWM showed preference for type II structure (734, 93 µM) over type I (733, 130 µM).\nAnother novel finding is that PWM showed significant affinity for high-mannose-type N-glycans 004 (150 µM), 005 (300 µM), and 007 (300 µM). This result suggests that PWM can bind glycans with elongation of the Manα1-6Manβ branch, but α1-2 extension from the α1-3Manβ branch blocks the binding. This observation conflicts with a previous report that PWM (Pa-2) binds glycans with Manα1-2 extension of the α1-3Manβ branch [55] . This discrepancy may be ascribed to the occurrence of isolectins, because the PWM used in this study was commercial product [65] . In this context, it is intriguing to know which feature is functionally related to the mitogenic activity of PWM and DSA in terms of isolectins, which other chitin-binding lectins lack [66, 67] .\nIn the present work, it was found that UDA bound to a series of high-mannose-type N-glycans (001-014 and 016), although there are only a few reports on such interactions [68] . In the present study, however, it became evident that the affinity to these glycans increased with the increasing number of Man residues ( Figure 5A ). Detailed structural inspection leads to speculation that UDA requires the presence of a Manα1-3(Manα1-6)Manα1-6Manβ structure, in which both non-reducing terminal Manα1-3 and Manα1-6 can be modified with Manα1-2 ( Figure 5B ). This is significantly different from PWM, which does not permit α1-2Man extension from the Manα1-3Manβ branch in the common recognition unit Manα1-3(Manα1-6)Manα1-6Manβ. These findings provide clues to interpret the results of binding experiments using these lectins as probes for high-mannose-type N-glycans. affinity, is 53 μM, which is 83 times weaker than LEL. However, PWM showed substantial affinity for glycolipid-type glycans 733 and 734. As found in the case for DSA and LEL, PWM showed preference for type II structure (734, 93 μM) over type I (733, 130 μM) .\nAnother novel finding is that PWM showed significant affinity for high-mannose-type N-glycans 004 (150 μM), 005 (300 μM), and 007 (300 μM). This result suggests that PWM can bind glycans with elongation of the Manα1-6Manβ branch, but α1-2 extension from the α1-3Manβ branch blocks the binding. This observation conflicts with a previous report that PWM (Pa-2) binds glycans with Manα1-2 extension of the α1-3Manβ branch [55] . This discrepancy may be ascribed to the occurrence of isolectins, because the PWM used in this study was commercial product [65] . In this context, it is intriguing to know which feature is functionally related to the mitogenic activity of PWM and DSA in terms of isolectins, which other chitin-binding lectins lack [66, 67] .\nIn the present work, it was found that UDA bound to a series of high-mannose-type N-glycans (001-014 and 016), although there are only a few reports on such interactions [68] . In the present study, however, it became evident that the affinity to these glycans increased with the increasing number of Man residues ( Figure 5A ). Detailed structural inspection leads to speculation that UDA requires the presence of a Manα1-3(Manα1-6)Manα1-6Manβ structure, in which both non-reducing terminal Manα1-3 and Manα1-6 can be modified with Manα1-2 ( Figure 5B ). This is significantly different from PWM, which does not permit α1-2Man extension from the Manα1-3Manβ branch in the common recognition unit Manα1-3(Manα1-6)Manα1-6Manβ. These findings provide clues to interpret the results of binding experiments using these lectins as probes for high-mannose-type N-glycans. \nIt is widely known that WGA interacts with heavily sialylated glycans on glycoproteins making a sialic acid cluster [17, 18, 69] . However, using FAC analysis, WGA showed no apparent affinity for sialoglycans (501-602), with the sole exception being 506 (930 µM), a hypersialylated triantennary N-glycan. Although the binding is marginal, the retardation is significant in terms of V − V 0 (6 µL). Marginal but significant binding was also observed for sialylated glycans 705 (1000 µM), 710 (1000 µM), and 712 (1100 µM), which contain Neu5Acα2-3Gal. In fact, WGA is extensively used as a practical probe for glycoproteins with α2-3Sia rather than with α2-6Sia.\nIn our initial round of FAC analysis using a standard set of PA-oligosaccharides, significant binding was found for 052 (29 µM), a sole hybrid-type N-glycan with a bisecting GlcNAc residue. Yamamoto et al. previously reported that WGA bound to hybrid-type N-glycans [70] . Therefore, we undertook further analysis using an additional set of hybrid- type N-glycans, i.e., 051, 053, 055, 056, 057 , and 058. We found that WGA specifically bound to hybrid-type N-glycans with a bisecting GlcNAc residue (051, 052, 053, 055, and 058) , but did not bind to molecules without it (056 and 057, Figure 6 ). However, WGA showed much lowered binding to complex-type N-glycans, even though they are equipped with a bisecting GlcNAc residue, 104 (1000 µM), 108 (1400 µM), 203 (1200 µM), 305 (1200 µM), and 311 (290 µM). The affinity significantly decreased with the introduction of a LacNAc structure with GlcNAc transferase (GnT) IV, as seen in comparisons between 051 (20 µM) and 052 (29 µM) and between 053 (19 µM) and 055 (33 µM). A sole exception is 310 (170 µM), which is a GlcNAc-exposed triantennary complex-type N-glycan lacking a bisecting GlcNAc residue. Considering the fact that WGA has no binding affinity for fully galactosylated glycans 308 and 406, which contain a bisecting GlcNAc residue, nor for an agalactosylated biantennary glycan 103, substantial binding to 310 as well as its analogue 311 could be attributed to the occurrence of a non-reducing terminal GlcNAc at two branch positions caused by GnT I and II as well as branching catalyzed by GnT IV. It is widely known that WGA interacts with heavily sialylated glycans on glycoproteins making a sialic acid cluster [17, 18, 69] . However, using FAC analysis, WGA showed no apparent affinity for sialoglycans (501-602), with the sole exception being 506 (930 μM), a hypersialylated triantennary N-glycan. Although the binding is marginal, the retardation is significant in terms of V − V0 (6 μL). Marginal but significant binding was also observed for sialylated glycans 705 (1000 μM), 710 (1000 μM), and 712 (1100 μM), which contain Neu5Acα2-3Gal. In fact, WGA is extensively used as a practical probe for glycoproteins with α2-3Sia rather than with α2-6Sia.\nIn our initial round of FAC analysis using a standard set of PA-oligosaccharides, significant binding was found for 052 (29 μM), a sole hybrid-type N-glycan with a bisecting GlcNAc residue. Yamamoto et al. previously reported that WGA bound to hybrid-type N-glycans [70] . Therefore, we undertook further analysis using an additional set of hybrid-type N-glycans, i.e., 051, 053, 055, 056, 057, and 058. We found that WGA specifically bound to hybrid-type N-glycans with a bisecting GlcNAc residue (051, 052, 053, 055, and 058) , but did not bind to molecules without it (056 and 057, Figure 6 ). However, WGA showed much lowered binding to complex-type N-glycans, even though they are equipped with a bisecting GlcNAc residue, 104 (1000 μM), 108 (1400 μM), 203 (1200 μM), 305 (1200 μM), and 311 (290 μM). The affinity significantly decreased with the introduction of a LacNAc structure with GlcNAc transferase (GnT) IV, as seen in comparisons between 051 (20 μM) and 052 (29 μM) and between 053 (19 μM) and 055 (33 μM). A sole exception is 310 (170 μM), which is a GlcNAc-exposed triantennary complex-type N-glycan lacking a bisecting GlcNAc residue. Considering the fact that WGA has no binding affinity for fully galactosylated glycans 308 and 406, which contain a bisecting GlcNAc residue, nor for an agalactosylated biantennary glycan 103, substantial binding to 310 as well as its analogue 311 could be attributed to the occurrence of a non-reducing terminal GlcNAc at two branch positions caused by GnT I and II as well as branching catalyzed by GnT IV. \nThe above FAC analyses provided basic data in terms of K d observed between immobilized lectins and fluorescently labeled diluted glycans. Lectins often exert much stronger binding (or avidity) toward multivalent forms of glycans, termed as the \"clustering effect of glycosides\" [71] . To investigate the affinity for multivalent oligosaccharides, the binding of the six chitin-binding lectins to immobilized glycans either in form of glycoproteins or synthetic glycans chemically conjugated with PAA was analyzed using a glycoconjugate microarray [49] . For reference, related glycans used in FAC are indicated in parentheses.\nAlthough only LEL and WGA showed significant affinity for PA-chitotriose in the FAC analysis, STL, PWM, and UDA also showed significant binding to chitobiose-PAA (D24; 906 in Figure 3 ) on the microarray platform, though their binding was much weaker than LEL and WGA (Figure 7 ; for bar graph representation see Figure S1 ). However, DSA binding was not detected. Overall, binding affinities to the immobilized glycans were enhanced in this assay system.\nAll six chitin-binding lectins showed significant binding to LacNAc (LN; B11; 901 in Figure 3 ) and its derivatives Galα1-3LacNAc (D8; 725 in Figure 3 ) and Galα1-4LacNAc (D9; 715 in Figure 3 D18) . Although it has been reported that STL binds to KS [72, 73] , STL did not show the binding to KS (D19) in this study. Considering that [6S]LacNAc, as well as its precursor LacNAc, are major components of KS, the inability of STL to bind to this neoglycoprotein (KS chemically conjugated to bovine serum albumin [49] ) is possibly a result of insufficient interaction with the epitope structures under the experimental conditions employed in this work.\nAll six chitin-binding lectins showed substantial binding to LacdiNAc (B17; not available in Figure 3 ), while no binding was observed to Lac (B8; 701 in Figure 3 ), indicating the importance of the presence of the lateral acetyl group of LacdiNAc unit. However, the binding was particularly evident in LEL, STL, and WGA. Notably, STL binding to this disaccharide was more selective than the other lectins. Considering that Galα1-3LacNAc, to which STL bound most strongly, is a xeno-antigen, and thus absent in human-derived samples, it may be a good probe for LacdiNAc structures in clinical samples in place of conventional Wisteria floribunda agglutinin (WFA), which binds to both α-and β-GalNAc [74] . WFA also binds strongly to glycoproteins, which have highly D18) . Although it has been reported that STL binds to KS [72, 73] , STL did not show the binding to KS (D19) in this study. Considering that [6S]LacNAc, as well as its precursor LacNAc, are major components of KS, the inability of STL to bind to this neoglycoprotein (KS chemically conjugated to bovine serum albumin [49] ) is possibly a result of insufficient interaction with the epitope structures under the experimental conditions employed in this work.\nAll six chitin-binding lectins showed substantial binding to LacdiNAc (B17; not available in Figure 3 ), while no binding was observed to Lac (B8; 701 in Figure 3 ), indicating the importance of the presence of the lateral acetyl group of LacdiNAc unit. However, the binding was particularly evident in LEL, STL, and WGA. Notably, STL binding to this disaccharide was more selective than the other lectins. Considering that Galα1-3LacNAc, to which STL bound most strongly, is a xeno-antigen, and thus absent in human-derived samples, it may be a good probe for LacdiNAc structures in clinical samples in place of conventional Wisteria floribunda agglutinin (WFA), which binds to both αand β-GalNAc [74] . WFA also binds strongly to glycoproteins, which have highly branched N-glycans such as asialo-α1-acid glycoprotein (asialo-AGP) to which STL bound weakly (B20) (Figure 7) . Only WGA showed extensive, but rather selective binding toward O-glycans (not available in Figure 3 except core 1, 911) ; i.e., strong binding was found to core 6 (GlcNAcβ1-6GalNAcα1-PAA; C16), core 4 (GlcNAcβ1-3(GlcNAcβ1-6)GalNAcα1-PAA; C14), and core 2 {Galβ1-3(GlcNAcβ1-6)GalNAcα1-PAA; C12}. WGA apparently recognizes GlcNAcβ1-6-terminated O-glycans, because no binding was observed to core 1 (Galβ1-3GalNAcα1-PAA; C11) and core 8 (Galα1-3Galα1-PAA; C17) disaccharides and only weak binding to core 3 (GlcNAcβ1-3GalNAcα1-PAA; C13) . WGA also bound to Tn antigen (GalNAcα-PAA; C10) and its anomer GalNAcβ-PAA (B15), but to a much lesser extent compared with GlcNAcβ-PAA (B23) and its 6-sulfo form ([6S]GlcNAcβ-PAA; B24). WGA bound strongly to a glycolipid-type, Forssman disaccharide (GalNAcα1-3GalNAcβ-PAA; C15; 717 in Figure 3 ).\nWith regard to glycoprotein ligands, Cy3-labeled WGA showed extensive binding to sialylated glycoproteins, though the signals were much stronger for FET (B1) and AGP (B21) than transferin (TF; B3) and thyroglobulin (TG; B4). However, DSA and UDA bound almost exclusively to TG (B4). This may reflect the difference in sialylation; FET contains sialylated triantennary N-glycans as the main components and AGP contains sialylated tri and tetraantennary N-glycans, while TF is composed of sialylated biantennary and TG contains high-mannose-type N-glycans in addition to biantennary complex-type and hybrid-type N-glycans. DSA, PWM, and UDA binding to TG (B4) may in part be attributed to binding to high-mannose-type N-glycans, which is consistent with FAC results. Other lectins (LEL and STL) also bound to TG (B4) but to a much lesser extent. Although these lectins did not show significant affinity for sialylated glycans in FAC, the observed binding to the glycoconjugate microarray is attributed to a clustering effect involving GlcNAc and/or acetyl group of Neu5Ac, a major component of sialic acid.\nAfter desialylation, DSA showed an apparently increased affinity for asialo-FET (B19), asialo-AGP (B20), and slightly for asialo-TF (B21). Conversely, the strong binding observed for TG was greatly reduced (asialo-TG; B22). It seems that a common feature of all of the chitin-binding lectins investigated here is that binding to TG was substantially reduced after sialidase treatment. Both WGA and UDA showed significant affinity for these desialylated glycoproteins, though the latter showed much stronger binding to asialo-TG (B22). However, LEL, PWM, and STL showed weak binding to asialo-AGP (B20), asialo-TF (B21), and asialo-TG (B22). UDA showed relatively low, but significant affinity for mannose polymers, such as mannan derived from Streptococcus aureus (SA; D21) and Candida albicans (CA; D22), which contrasts with other chitin-binding lectins. This may be related to the FAC result that UDA shows extensive affinity for high-mannose-type N-glycans. Indeed, UDA showed strong binding to invertase (Inver; C9) and ovalbumin (OVA; C5), which have high-mannose-type N-glycans as major components.\nAll of the lectins tested in this work showed significant affinity for ovomucoid (OVM; C4) to various extents, which consists of agalactosylated and, thus, GlcNAc-exposed, complex-type N-glycans. Particularly strong binding was observed for DSA, which could be attributed to the presence of partially galactosylated multi-antennary, complex-type N-glycans, which DSA recognizes preferentially. The presence of bisecting GlcNAc in OVM may explain the strong binding of WGA.\nThus, the interpretation of glycoconjugate microarray, mimicking cell surface probing with these lectins, is not simple. Possible reasons for discrepancies between the results of FAC and glycoconjugate microarray include the cluster effect evident in the latter method. Lectin immobilization may also alter binding properties in FAC as well as in lectin microarray described below. Moreover, it should also be noted that any array platform is basically different from FAC in that the former is a \"competitive platform\" with a panel of immobilized glycans or lectins, which are reacted in a competitive manner with labeled probes; e.g., Cy3-lectins and glycoproteins. On the other hand, basic specificities of lectins are obtained by FAC using structure-defined purified glycans without any effect of carrier protein and with less effect of clustering of glycans (they are maximally diluted). In this regard, it should also be noted that native glycoproteins consist of considerably heterogeneous glycoforms [75] .\nAll six chitin-binding lectins bound to sialylated glycoproteins in the glycoconjugate microarray (Figure 7) , while they showed no apparent affinity for sialylated oligosaccharides in the FAC assay ( Figure 4 ). This discrepancy is explained, at least in part, by the glycoside-clustering effect of the acetyl group of sialic acid (Neu5Ac). To examine this idea, binding features were compared on the lectin microarray platform using FET as a model sialoglycoprotein both before and after sialidase treatment.\nAs shown in Figure 8 , signal intensities of a series of Sia-binding lectins (MAL, SNA, SSA, TJA-I, and MAH) were drastically decreased after desialylation. Conversely, signal intensities of Gal-binding lectins (ECA, BPL, TJA-II, PNA WFA, and SBA) became much stronger after the sialidase treatment, with the exception of RCA120. It is known that RCA120 does not completely lose affinity for Siaα2-6Gal [9] , which is a major linkage of sialic acid in FET [76, 77] . Among the six chitin-binding lectins, signal intensities of DSA, LEL, STL, and UDA were reduced for asialo-FET by approximately 11%, 42%, 34%, and 34%, respectively. However, WGA showed as much as 83% reduction in the observed signal after desialylation. Thus, the effect of sialic acid clustering is significant, but rather modest for most of the chitin-binding lectins under conditions where lectins are immobilized and diluted sialoglycoprotein, such as in FET. However, WGA showed enhanced affinity for FET compared with asialo-FET, similar to that in the glycoconjugate microarray. Therefore, sialic acid clustering is sufficient for WGA recognition at a glycoprotein level (triantennary N-glycans in FET), but not at a liberated glycan level as is the case in FAC analysis.\nHistorically, plant lectins have been used for analysis and separation of various glycans, which are mainly of animal origin. Among them, however, chitin-binding lectins have been used to detect and inhibit parasites or viruses, which recognize chito-oligosaccharides as target molecules [78, 79] . They have also been shown to be useful probes for cell surface glycan structures containing poly-LacNAc [24, 61, 62] . A recent study supports the idea that various lectins, including chitin-binding lectins, can prevent viral infection in vivo [80] .\nIn this study, six representative chitin-binding lectins belonging to the hevein family were investigated in detail for their sugar-binding properties (for summary, see Table 2 ). However, there are many other chitin-binding lectins, which do not belong to the hevein family [81] . They include LysM (lysin motif), which was initially found in several bacterial autolysin proteins and is often associated with chitinase as a carbohydrate-binding module [82] . Interestingly, LysM also consists of a small number (approximately 50) of amino acids, including evolutionarily conserved disulfide bonds. It seems, however, that binding features to chito-oligosaccharides are fairly different between the two families [81] . Considering both compact and stable structures, chitin-binding lectins are good targets for protein engineering aimed at improving specific properties, which natural lectins lack. More diverse oligosaccharide specificity will be generated by recently developed molecular engineering strategies [83, 84] . Alternatively, tandem-repeat type lectins, such as WGA and UDA, may improve their performance both in terms of binding affinity and specificity by selecting one of their repeating CRDs resulting in a \"homogenous\" tandem-repeat. It is widely believed that individual CRDs, after duplication in the course of evolution, diverge from each other and, thus, their specificities have also diverged. In this context, it is important to identify a CRD responsible for the desired specificity, e.g., affinity for hybrid-type N-glycans containing bisecting GlcNAc in WGA. So far, however, such an approach has never been made with chitin-binding lectins. Future studies necessary for this approach include practical application of naturally and artificially produced chitin-binding lectins in various fields, e.g., medical, material and food sciences. Using the information obtained in these studies will generate more precise and systematic knowledge for lectin utilization in complex life systems.\nN-hydroxysuccinimide (NHS)-activated Sepharose 4 Fast Flow was purchased from GE Healthcare (Little Chalfont, Buckinghamshire, UK). All chemical reagents used in this study were of analytical grade. FET from fetal calf serum (48,400 Da) was purchased from Sigma (St. Louis, MO, USA).\npNP glycosides Galβ1-4GlcNAcβ (LacNAc-β-pNP), GlcNAcβ1-4GlcNAcβ1-4GlcNAcβ1-4GlcNAcβ1 (chitotetraose-β-pNP), and GlcNAcβ1-4GlcNAcβ1-4GlcNAcβ1-4GlcNAcβ1-4GlcNAcβ1 (chitopentaose-β-pNP), were obtained from Toronto Research Chemicals, Inc. (North York, ON, Canada).\nStructure-defined, purified standard PA-oligosaccharides used in this study are shown in Figure 3 . PA -N-glycans numbered 001-014, 103, 105, 107, 108, 307, 313, 314, 323, 405, 410, 418-420, 501-504 , and 506 were purchased from Takara Bio, Inc. (Kyoto, Japan), 304, 403, and 404 were obtained from J-OIL MILLS. Inc. (Tokyo, Japan), and other PA-N-glycans were obtained from Seikagaku Co. The non-labeled glycans (601 and 602) were obtained from Dextra Laboratories, Ltd. (Reading, UK) and labeled with 2-aminopyridine with a GlycoTAG (Takara Bio, Inc.). The derived PA-N-glycans were purified and quantified as described previously [85] .\nGlycolipid and other types of glycans, 701-703, 705-713, 715-718, 720, 721, 724, 726 and 728-731, were obtained as their PA-derivatives from Takara Bio, Inc. or as non-labeled glycans which were pyridylaminated: 727 from Funakoshi Co., 704, 733, and 734 from Dextra Laboratories, Ltd., 725, 909, 910, and 911 from Calbiochem, and 906 and 907 from Seikagaku Co. Oligo-N-acetyllactosamines 901-903 and 905 and milk oligosaccharides 722, 723, 732, and 735-739 were generous gifts from K. Yoshida (Seikagaku Co., Tokyo, Japan) and T. Urashima (Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan), respectively. . For FAC analysis, the slurry of each lectin-Sepharose was packed into a miniature column (inner diameter, 2 mm; length, 10 mm; bed volume, 31.4 µL; Shimadzu Co., Kyoto, Japan) as described previously [9, 48, 52] . The amount of uncoupled protein in the above wash fraction was determined by the Bradford method, and hereby, the amount of immobilized protein was estimated.\nFAC was performed using an automated system, FAC-1 or FAC-T, as described previously [9, 48, 52] . Briefly, the above lectin-immobilized columns were connected to the FAC-1 or FAC-T and were equilibrated with TBS. The flow rate and column temperature were kept at 0.125 mL/min and 25 • C, respectively. After equilibration of the columns, either excess volume of PA or pNP-oligosaccharides dissolved in TBS were successively injected into each of the lectin columns. Elution of PA-oligosaccharides (2.5 or 5.0 nM) was monitored by fluorescence (excitation and emission wavelengths of 310 and 380 nm, respectively), while that of pNP-oligosaccharides (2-60 µM) was monitored by UV adsorption (280 nm). The volume of the elution front (V) of each oligosaccharide was calculated as described previously [46] [47] [48] . V 0 was determined for an appropriate reference substance; i.e., Manα1-6(Manα1-2)Manβ1-4GlcNAcβ1-4GlcNAc-PA (003) for DSA, LEL, STL, and WGA, Galβ1-4Glc-PA (701) for UDA, and 003 or Galβ1-3GalNAcβ1-4Galβ1-4Glc-PA (703) for PWM. Hence, retardation of the elution front of each oligosaccharide, i.e., V − V 0 , was used for determination of K d values. Since [A] 0 is, in most cases, much smaller than K d , the equation can be simplified to be\nIt is often useful to discuss lectin-oligosaccharide interactions in terms of an affinity constant, K a (1/K d ), instead of K d . When binding affinity of a particular glycan was too high to measure V − V 0 , we determined its K d (or K a ) value using another column with an appropriately lowered lectin concentration. This was applied in the cases of DSA (6.0 and 1.5 mg/mL), UDA (6.0, 3.0, 1.0, and 0.3 mg/mL), WGA (7.0, 2.0, and 0.5 mg/mL), and LEL (6.0 and 0.5 mg/mL). To combine data from the two columns, a ratio between them was determined using V − V 0 values of a reference glycan, which showed significant retardation in both columns.\nFor the determination of B t and K d values for each lectin column, an appropriate pNP-saccharide was diluted to various concentrations (2-100 µM) and was used for concentration-dependent analysis. Using the resulting V values, Woolf-Hofstee-type plots, i.e., (V − V 0 ) vs. (V − V 0 )[A] 0 , were constructed to determine B t and K d values from the intercept and the slope of the fitted curves, respectively, as described previously [9] .\nTo validate the binding specificity data obtained by FAC and observe the effect of clustering on the immobilized glycans, glycoconjugate microarray analysis was performed [49] . Briefly, 60 µL of Cy3-labeled lectins (at a final concentration of 4.0 µg/mL) used for FAC was applied to the glycoconjugate microarray (ver. 4.2). After incubation for interaction at 20 • C overnight, wells on the glass slide were rinsed twice with the probing buffer (Tris-buffered saline, pH 7.4 containing 1% Triton X-100, 1 mM CaCl 2 , and 1 mM MnCl 2 ) for the microarray and fluorescence images of the microarray were acquired using an evanescent-field activated fluorescence scanner, GlycoStation Reader™ 1200 (GlycoTechnica Ltd., Yokohama, Japan). Scanning conditions were as follows: exposure time, 199 ms; detection sensitivities, gain 115 for DSA, LEL, STL, and UDA, gain 125 for PWM, and gain 110 for STL.\nTo investigate the clustering effect for sialic acid (Neu5Ac), another interaction analysis was performed between immobilized lectins and a sialoglycoprotein, FET, in a lectin microarray platform. Asialo-FET was prepared by digestion of FET with sialidase A (Prozyme Inc., San Leandro, CA, USA) according to the protocol provided by the manufacturer. For comparison, solutions of FET and asialo-FET were prepared at 2.0 µg/mL and were applied to a lectin microarray for analysis as described previously [9] . Scanning conditions were as follows: exposure time, 199 ms; detection sensitivities, gain 90 and 80 for FET and asialo-FET, respectively. Data were analyzed with the Array Pro analyzer ver. 4.5 (Media Cybernetics, Rockville, MD, USA) and are represented by bar graphs in terms of net signal intensities.\nIn the present study, various novel features of chitin-binding lectins became evident (Table 2) . It also became clear that results of FAC and glycoconjugate microarray are not necessarily consistent, and the interpretation of glycoconjugate microarray is not simple. Nevertheless, data derived by the present quantitative FAC analysis using structure-defined standard glycans provide key information to solve complex phenomena of biological systems, which include studies using these lectins in histochemical and cell separation studies. Currently, it is not known whether the described characteristics are attributed to differences in overall structural architectures (i.e., proto, chimera, or tandem-repeat) or in amino-acid sequences in CRDs. Detailed structural analysis is necessary to define the sugar-binding specificity of each CRD. Construction of tandem-repeat type homogenous hevein-like domains should lead to the development of a series of artificial chitin-binding lectins with much stronger avidity and much higher specificity. 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