
PMC:7352545 / 62180-64185
Annnotations
LitCovid_Glycan-Motif-Structure
{"project":"LitCovid_Glycan-Motif-Structure","denotations":[{"id":"T201","span":{"begin":1371,"end":1382},"obj":"https://glytoucan.org/Structures/Glycans/G43702JT"}],"text":"For glycan interaction, HCoV-NL63 and MHV utilize heparan sulfate proteoglycans (HSPGs) as attachment enhancers [87,124]. Viruses recognize HSPGs as attachment molecules. In the spike (S) protein-deficient virions, the M protein recognizes HSPG. The S proteins generally bind to the viral cellular receptor. However, the M protein also acts as a receptor in the early step of HCoV-NL63 infection. The M membrane protein of HCoV-NL63 recognizes the attachment site of HSPGs. HCoV-NL63 M protein binds to HSPG for the initial attachment of virus to host cells and thereafter, the M and S proteins cooperate for virus entrance into the host cells [125]. HSPGs are glycosaminoglycan (GAG)-carrying proteins frequently used as a secondary receptor for viral entry. HSPGs are composed of covalent-bonded HS chains as a GAG form. The HS GAG linkage structure of tetrasaccharide exhibits GluAβ1,3GlcNAcα1,4Galβ1,3Galβ1,4Xylβ-O-serine. Glycosyltransferases involved in HS GAG synthesis include GlcAT-II (glucuronosyltransferase) and GlcNAcT-II (N-acetylglucosaminyltransferase II) for heparan sulfate synthesis (Figure 9). GAG is used as docking sites for virus interaction with the host cell surface. GAGs contain negatively charged N- and O-sulfated sugars [126]. The biosynthetic pathway and biologic roles in early embryogenic morphogenesis and vulval morphogenesis of HS and chondroitin sulfate GAG have been elucidated in Caenorhabditis elegans [127]. The negative charges mediate the interaction of GAGs and their ligands through electrostatic forces. Interaction of HSPG with ligands potentiates many virus infectious cycles. For examples, adeno-associated virus, human T cell lymphotropic virus type 1, human papilloma virus 16, herpes viruses, hepatitis B and C viruses, Kaposi’s sarcoma-associated herpesvirus, human papilloma viruses and Merkel cell polyoma virus recognize the HSPGs [128,129]. HSPGs increase virulence upon interaction with viral factors required for viral attachment and replication."}
LitCovid-PD-FMA-UBERON
{"project":"LitCovid-PD-FMA-UBERON","denotations":[{"id":"T571","span":{"begin":50,"end":79},"obj":"Body_part"},{"id":"T572","span":{"begin":50,"end":65},"obj":"Body_part"},{"id":"T573","span":{"begin":81,"end":86},"obj":"Body_part"},{"id":"T574","span":{"begin":140,"end":145},"obj":"Body_part"},{"id":"T575","span":{"begin":188,"end":195},"obj":"Body_part"},{"id":"T576","span":{"begin":221,"end":228},"obj":"Body_part"},{"id":"T577","span":{"begin":240,"end":244},"obj":"Body_part"},{"id":"T578","span":{"begin":252,"end":260},"obj":"Body_part"},{"id":"T579","span":{"begin":323,"end":330},"obj":"Body_part"},{"id":"T580","span":{"begin":412,"end":419},"obj":"Body_part"},{"id":"T581","span":{"begin":467,"end":472},"obj":"Body_part"},{"id":"T582","span":{"begin":486,"end":493},"obj":"Body_part"},{"id":"T583","span":{"begin":503,"end":507},"obj":"Body_part"},{"id":"T584","span":{"begin":552,"end":557},"obj":"Body_part"},{"id":"T585","span":{"begin":586,"end":594},"obj":"Body_part"},{"id":"T586","span":{"begin":638,"end":643},"obj":"Body_part"},{"id":"T587","span":{"begin":651,"end":656},"obj":"Body_part"},{"id":"T588","span":{"begin":661,"end":678},"obj":"Body_part"},{"id":"T589","span":{"begin":680,"end":683},"obj":"Body_part"},{"id":"T590","span":{"begin":694,"end":702},"obj":"Body_part"},{"id":"T591","span":{"begin":760,"end":765},"obj":"Body_part"},{"id":"T592","span":{"begin":798,"end":800},"obj":"Body_part"},{"id":"T593","span":{"begin":813,"end":816},"obj":"Body_part"},{"id":"T594","span":{"begin":827,"end":829},"obj":"Body_part"},{"id":"T595","span":{"begin":830,"end":833},"obj":"Body_part"},{"id":"T596","span":{"begin":919,"end":925},"obj":"Body_part"},{"id":"T597","span":{"begin":960,"end":962},"obj":"Body_part"},{"id":"T598","span":{"begin":963,"end":966},"obj":"Body_part"},{"id":"T599","span":{"begin":1076,"end":1091},"obj":"Body_part"},{"id":"T600","span":{"begin":1114,"end":1117},"obj":"Body_part"},{"id":"T601","span":{"begin":1179,"end":1191},"obj":"Body_part"},{"id":"T602","span":{"begin":1179,"end":1183},"obj":"Body_part"},{"id":"T603","span":{"begin":1243,"end":1249},"obj":"Body_part"},{"id":"T604","span":{"begin":1364,"end":1366},"obj":"Body_part"},{"id":"T605","span":{"begin":1371,"end":1390},"obj":"Body_part"},{"id":"T606","span":{"begin":1391,"end":1394},"obj":"Body_part"},{"id":"T607","span":{"begin":1565,"end":1569},"obj":"Body_part"},{"id":"T608","span":{"begin":1671,"end":1675},"obj":"Body_part"},{"id":"T609","span":{"begin":1841,"end":1852},"obj":"Body_part"},{"id":"T610","span":{"begin":1848,"end":1852},"obj":"Body_part"},{"id":"T611","span":{"begin":1881,"end":1886},"obj":"Body_part"},{"id":"T612","span":{"begin":1898,"end":1903},"obj":"Body_part"}],"attributes":[{"id":"A571","pred":"fma_id","subj":"T571","obj":"http://purl.org/sig/ont/fma/fma82834"},{"id":"A572","pred":"fma_id","subj":"T572","obj":"http://purl.org/sig/ont/fma/fma63023"},{"id":"A573","pred":"fma_id","subj":"T573","obj":"http://purl.org/sig/ont/fma/fma82834"},{"id":"A574","pred":"fma_id","subj":"T574","obj":"http://purl.org/sig/ont/fma/fma82834"},{"id":"A575","pred":"fma_id","subj":"T575","obj":"http://purl.org/sig/ont/fma/fma67257"},{"id":"A576","pred":"fma_id","subj":"T576","obj":"http://purl.org/sig/ont/fma/fma67257"},{"id":"A577","pred":"fma_id","subj":"T577","obj":"http://purl.org/sig/ont/fma/fma82834"},{"id":"A578","pred":"fma_id","subj":"T578","obj":"http://purl.org/sig/ont/fma/fma67257"},{"id":"A579","pred":"fma_id","subj":"T579","obj":"http://purl.org/sig/ont/fma/fma67257"},{"id":"A580","pred":"fma_id","subj":"T580","obj":"http://purl.org/sig/ont/fma/fma67257"},{"id":"A581","pred":"fma_id","subj":"T581","obj":"http://purl.org/sig/ont/fma/fma82834"},{"id":"A582","pred":"fma_id","subj":"T582","obj":"http://purl.org/sig/ont/fma/fma67257"},{"id":"A583","pred":"fma_id","subj":"T583","obj":"http://purl.org/sig/ont/fma/fma82834"},{"id":"A584","pred":"fma_id","subj":"T584","obj":"http://purl.org/sig/ont/fma/fma68646"},{"id":"A585","pred":"fma_id","subj":"T585","obj":"http://purl.org/sig/ont/fma/fma67257"},{"id":"A586","pred":"fma_id","subj":"T586","obj":"http://purl.org/sig/ont/fma/fma68646"},{"id":"A587","pred":"fma_id","subj":"T587","obj":"http://purl.org/sig/ont/fma/fma82834"},{"id":"A588","pred":"fma_id","subj":"T588","obj":"http://purl.org/sig/ont/fma/fma63011"},{"id":"A589","pred":"fma_id","subj":"T589","obj":"http://purl.org/sig/ont/fma/fma63011"},{"id":"A590","pred":"fma_id","subj":"T590","obj":"http://purl.org/sig/ont/fma/fma67257"},{"id":"A591","pred":"fma_id","subj":"T591","obj":"http://purl.org/sig/ont/fma/fma82834"},{"id":"A592","pred":"fma_id","subj":"T592","obj":"http://purl.org/sig/ont/fma/fma63023"},{"id":"A593","pred":"fma_id","subj":"T593","obj":"http://purl.org/sig/ont/fma/fma63011"},{"id":"A594","pred":"fma_id","subj":"T594","obj":"http://purl.org/sig/ont/fma/fma63023"},{"id":"A595","pred":"fma_id","subj":"T595","obj":"http://purl.org/sig/ont/fma/fma63011"},{"id":"A596","pred":"fma_id","subj":"T596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glycan interaction, HCoV-NL63 and MHV utilize heparan sulfate proteoglycans (HSPGs) as attachment enhancers [87,124]. Viruses recognize HSPGs as attachment molecules. In the spike (S) protein-deficient virions, the M protein recognizes HSPG. The S proteins generally bind to the viral cellular receptor. However, the M protein also acts as a receptor in the early step of HCoV-NL63 infection. The M membrane protein of HCoV-NL63 recognizes the attachment site of HSPGs. HCoV-NL63 M protein binds to HSPG for the initial attachment of virus to host cells and thereafter, the M and S proteins cooperate for virus entrance into the host cells [125]. HSPGs are glycosaminoglycan (GAG)-carrying proteins frequently used as a secondary receptor for viral entry. HSPGs are composed of covalent-bonded HS chains as a GAG form. The HS GAG linkage structure of tetrasaccharide exhibits GluAβ1,3GlcNAcα1,4Galβ1,3Galβ1,4Xylβ-O-serine. Glycosyltransferases involved in HS GAG synthesis include GlcAT-II (glucuronosyltransferase) and GlcNAcT-II (N-acetylglucosaminyltransferase II) for heparan sulfate synthesis (Figure 9). GAG is used as docking sites for virus interaction with the host cell surface. GAGs contain negatively charged N- and O-sulfated sugars [126]. The biosynthetic pathway and biologic roles in early embryogenic morphogenesis and vulval morphogenesis of HS and chondroitin sulfate GAG have been elucidated in Caenorhabditis elegans [127]. The negative charges mediate the interaction of GAGs and their ligands through electrostatic forces. Interaction of HSPG with ligands potentiates many virus infectious cycles. For examples, adeno-associated virus, human T cell lymphotropic virus type 1, human papilloma virus 16, herpes viruses, hepatitis B and C viruses, Kaposi’s sarcoma-associated herpesvirus, human papilloma viruses and Merkel cell polyoma virus recognize the HSPGs [128,129]. HSPGs increase virulence upon interaction with viral factors required for viral attachment and replication."}
LitCovid-PD-UBERON
{"project":"LitCovid-PD-UBERON","denotations":[{"id":"T32","span":{"begin":448,"end":463},"obj":"Body_part"}],"attributes":[{"id":"A32","pred":"uberon_id","subj":"T32","obj":"http://purl.obolibrary.org/obo/UBERON_4200047"}],"text":"For glycan interaction, HCoV-NL63 and MHV utilize heparan sulfate proteoglycans (HSPGs) as attachment enhancers [87,124]. Viruses recognize HSPGs as attachment molecules. In the spike (S) protein-deficient virions, the M protein recognizes HSPG. The S proteins generally bind to the viral cellular receptor. However, the M protein also acts as a receptor in the early step of HCoV-NL63 infection. The M membrane protein of HCoV-NL63 recognizes the attachment site of HSPGs. HCoV-NL63 M protein binds to HSPG for the initial attachment of virus to host cells and thereafter, the M and S proteins cooperate for virus entrance into the host cells [125]. HSPGs are glycosaminoglycan (GAG)-carrying proteins frequently used as a secondary receptor for viral entry. HSPGs are composed of covalent-bonded HS chains as a GAG form. The HS GAG linkage structure of tetrasaccharide exhibits GluAβ1,3GlcNAcα1,4Galβ1,3Galβ1,4Xylβ-O-serine. Glycosyltransferases involved in HS GAG synthesis include GlcAT-II (glucuronosyltransferase) and GlcNAcT-II (N-acetylglucosaminyltransferase II) for heparan sulfate synthesis (Figure 9). GAG is used as docking sites for virus interaction with the host cell surface. GAGs contain negatively charged N- and O-sulfated sugars [126]. The biosynthetic pathway and biologic roles in early embryogenic morphogenesis and vulval morphogenesis of HS and chondroitin sulfate GAG have been elucidated in Caenorhabditis elegans [127]. The negative charges mediate the interaction of GAGs and their ligands through electrostatic forces. Interaction of HSPG with ligands potentiates many virus infectious cycles. For examples, adeno-associated virus, human T cell lymphotropic virus type 1, human papilloma virus 16, herpes viruses, hepatitis B and C viruses, Kaposi’s sarcoma-associated herpesvirus, human papilloma viruses and Merkel cell polyoma virus recognize the HSPGs [128,129]. HSPGs increase virulence upon interaction with viral factors required for viral attachment and replication."}
LitCovid-PD-MONDO
{"project":"LitCovid-PD-MONDO","denotations":[{"id":"T245","span":{"begin":386,"end":395},"obj":"Disease"},{"id":"T246","span":{"begin":1606,"end":1616},"obj":"Disease"},{"id":"T247","span":{"begin":1709,"end":1718},"obj":"Disease"},{"id":"T248","span":{"begin":1745,"end":1756},"obj":"Disease"},{"id":"T249","span":{"begin":1745,"end":1754},"obj":"Disease"},{"id":"T250","span":{"begin":1772,"end":1788},"obj":"Disease"},{"id":"T251","span":{"begin":1781,"end":1788},"obj":"Disease"},{"id":"T252","span":{"begin":1819,"end":1828},"obj":"Disease"}],"attributes":[{"id":"A245","pred":"mondo_id","subj":"T245","obj":"http://purl.obolibrary.org/obo/MONDO_0005550"},{"id":"A246","pred":"mondo_id","subj":"T246","obj":"http://purl.obolibrary.org/obo/MONDO_0005550"},{"id":"A247","pred":"mondo_id","subj":"T247","obj":"http://purl.obolibrary.org/obo/MONDO_0002363"},{"id":"A248","pred":"mondo_id","subj":"T248","obj":"http://purl.obolibrary.org/obo/MONDO_0005344"},{"id":"A249","pred":"mondo_id","subj":"T249","obj":"http://purl.obolibrary.org/obo/MONDO_0002251"},{"id":"A250","pred":"mondo_id","subj":"T250","obj":"http://purl.obolibrary.org/obo/MONDO_0005055"},{"id":"A251","pred":"mondo_id","subj":"T251","obj":"http://purl.obolibrary.org/obo/MONDO_0005089"},{"id":"A252","pred":"mondo_id","subj":"T252","obj":"http://purl.obolibrary.org/obo/MONDO_0002363"}],"text":"For glycan interaction, HCoV-NL63 and MHV utilize heparan sulfate proteoglycans (HSPGs) as attachment enhancers [87,124]. Viruses recognize HSPGs as attachment molecules. In the spike (S) protein-deficient virions, the M protein recognizes HSPG. The S proteins generally bind to the viral cellular receptor. However, the M protein also acts as a receptor in the early step of HCoV-NL63 infection. The M membrane protein of HCoV-NL63 recognizes the attachment site of HSPGs. HCoV-NL63 M protein binds to HSPG for the initial attachment of virus to host cells and thereafter, the M and S proteins cooperate for virus entrance into the host cells [125]. HSPGs are glycosaminoglycan (GAG)-carrying proteins frequently used as a secondary receptor for viral entry. HSPGs are composed of covalent-bonded HS chains as a GAG form. The HS GAG linkage structure of tetrasaccharide exhibits GluAβ1,3GlcNAcα1,4Galβ1,3Galβ1,4Xylβ-O-serine. Glycosyltransferases involved in HS GAG synthesis include GlcAT-II (glucuronosyltransferase) and GlcNAcT-II (N-acetylglucosaminyltransferase II) for heparan sulfate synthesis (Figure 9). GAG is used as docking sites for virus interaction with the host cell surface. GAGs contain negatively charged N- and O-sulfated sugars [126]. The biosynthetic pathway and biologic roles in early embryogenic morphogenesis and vulval morphogenesis of HS and chondroitin sulfate GAG have been elucidated in Caenorhabditis elegans [127]. The negative charges mediate the interaction of GAGs and their ligands through electrostatic forces. Interaction of HSPG with ligands potentiates many virus infectious cycles. For examples, adeno-associated virus, human T cell lymphotropic virus type 1, human papilloma virus 16, herpes viruses, hepatitis B and C viruses, Kaposi’s sarcoma-associated herpesvirus, human papilloma viruses and Merkel cell polyoma virus recognize the HSPGs [128,129]. HSPGs increase virulence upon interaction with viral factors required for viral attachment and replication."}
LitCovid-PD-CLO
{"project":"LitCovid-PD-CLO","denotations":[{"id":"T889","span":{"begin":50,"end":79},"obj":"http://purl.obolibrary.org/obo/PR_000001307"},{"id":"T890","span":{"begin":81,"end":86},"obj":"http://purl.obolibrary.org/obo/PR_000001307"},{"id":"T891","span":{"begin":122,"end":129},"obj":"http://purl.obolibrary.org/obo/NCBITaxon_10239"},{"id":"T892","span":{"begin":140,"end":145},"obj":"http://purl.obolibrary.org/obo/PR_000001307"},{"id":"T893","span":{"begin":344,"end":345},"obj":"http://purl.obolibrary.org/obo/CLO_0001020"},{"id":"T894","span":{"begin":403,"end":411},"obj":"http://purl.obolibrary.org/obo/UBERON_0000158"},{"id":"T895","span":{"begin":467,"end":472},"obj":"http://purl.obolibrary.org/obo/PR_000001307"},{"id":"T896","span":{"begin":538,"end":543},"obj":"http://purl.obolibrary.org/obo/NCBITaxon_10239"},{"id":"T897","span":{"begin":552,"end":557},"obj":"http://purl.obolibrary.org/obo/GO_0005623"},{"id":"T898","span":{"begin":609,"end":614},"obj":"http://purl.obolibrary.org/obo/NCBITaxon_10239"},{"id":"T899","span":{"begin":638,"end":643},"obj":"http://purl.obolibrary.org/obo/GO_0005623"},{"id":"T900","span":{"begin":651,"end":656},"obj":"http://purl.obolibrary.org/obo/PR_000001307"},{"id":"T901","span":{"begin":722,"end":723},"obj":"http://purl.obolibrary.org/obo/CLO_0001020"},{"id":"T902","span":{"begin":760,"end":765},"obj":"http://purl.obolibrary.org/obo/PR_000001307"},{"id":"T903","span":{"begin":811,"end":812},"obj":"http://purl.obolibrary.org/obo/CLO_0001020"},{"id":"T904","span":{"begin":1147,"end":1152},"obj":"http://purl.obolibrary.org/obo/NCBITaxon_10239"},{"id":"T905","span":{"begin":1179,"end":1183},"obj":"http://purl.obolibrary.org/obo/GO_0005623"},{"id":"T906","span":{"begin":1600,"end":1605},"obj":"http://purl.obolibrary.org/obo/NCBITaxon_10239"},{"id":"T907","span":{"begin":1656,"end":1661},"obj":"http://purl.obolibrary.org/obo/NCBITaxon_10239"},{"id":"T908","span":{"begin":1663,"end":1668},"obj":"http://purl.obolibrary.org/obo/NCBITaxon_9606"},{"id":"T909","span":{"begin":1669,"end":1675},"obj":"http://purl.obolibrary.org/obo/CL_0000084"},{"id":"T910","span":{"begin":1689,"end":1694},"obj":"http://purl.obolibrary.org/obo/NCBITaxon_10239"},{"id":"T911","span":{"begin":1703,"end":1708},"obj":"http://purl.obolibrary.org/obo/NCBITaxon_9606"},{"id":"T912","span":{"begin":1719,"end":1724},"obj":"http://purl.obolibrary.org/obo/NCBITaxon_10239"},{"id":"T913","span":{"begin":1736,"end":1743},"obj":"http://purl.obolibrary.org/obo/NCBITaxon_10239"},{"id":"T914","span":{"begin":1755,"end":1756},"obj":"http://purl.obolibrary.org/obo/CLO_0001021"},{"id":"T915","span":{"begin":1763,"end":1770},"obj":"http://purl.obolibrary.org/obo/NCBITaxon_10239"},{"id":"T916","span":{"begin":1813,"end":1818},"obj":"http://purl.obolibrary.org/obo/NCBITaxon_9606"},{"id":"T917","span":{"begin":1829,"end":1836},"obj":"http://purl.obolibrary.org/obo/NCBITaxon_10239"},{"id":"T918","span":{"begin":1848,"end":1852},"obj":"http://purl.obolibrary.org/obo/GO_0005623"},{"id":"T919","span":{"begin":1861,"end":1866},"obj":"http://purl.obolibrary.org/obo/NCBITaxon_10239"},{"id":"T920","span":{"begin":1881,"end":1886},"obj":"http://purl.obolibrary.org/obo/PR_000001307"},{"id":"T921","span":{"begin":1898,"end":1903},"obj":"http://purl.obolibrary.org/obo/PR_000001307"}],"text":"For glycan interaction, HCoV-NL63 and MHV utilize heparan sulfate proteoglycans (HSPGs) as attachment enhancers [87,124]. Viruses recognize HSPGs as attachment molecules. In the spike (S) protein-deficient virions, the M protein recognizes HSPG. The S proteins generally bind to the viral cellular receptor. However, the M protein also acts as a receptor in the early step of HCoV-NL63 infection. The M membrane protein of HCoV-NL63 recognizes the attachment site of HSPGs. HCoV-NL63 M protein binds to HSPG for the initial attachment of virus to host cells and thereafter, the M and S proteins cooperate for virus entrance into the host cells [125]. HSPGs are glycosaminoglycan (GAG)-carrying proteins frequently used as a secondary receptor for viral entry. HSPGs are composed of covalent-bonded HS chains as a GAG form. The HS GAG linkage structure of tetrasaccharide exhibits GluAβ1,3GlcNAcα1,4Galβ1,3Galβ1,4Xylβ-O-serine. Glycosyltransferases involved in HS GAG synthesis include GlcAT-II (glucuronosyltransferase) and GlcNAcT-II (N-acetylglucosaminyltransferase II) for heparan sulfate synthesis (Figure 9). GAG is used as docking sites for virus interaction with the host cell surface. GAGs contain negatively charged N- and O-sulfated sugars [126]. The biosynthetic pathway and biologic roles in early embryogenic morphogenesis and vulval morphogenesis of HS and chondroitin sulfate GAG have been elucidated in Caenorhabditis elegans [127]. The negative charges mediate the interaction of GAGs and their ligands through electrostatic forces. Interaction of HSPG with ligands potentiates many virus infectious cycles. For examples, adeno-associated virus, human T cell lymphotropic virus type 1, human papilloma virus 16, herpes viruses, hepatitis B and C viruses, Kaposi’s sarcoma-associated herpesvirus, human papilloma viruses and Merkel cell polyoma virus recognize the HSPGs [128,129]. HSPGs increase virulence upon interaction with viral factors required for viral attachment and replication."}
LitCovid-PD-CHEBI
{"project":"LitCovid-PD-CHEBI","denotations":[{"id":"T243","span":{"begin":50,"end":65},"obj":"Chemical"},{"id":"T244","span":{"begin":50,"end":57},"obj":"Chemical"},{"id":"T245","span":{"begin":58,"end":65},"obj":"Chemical"},{"id":"T246","span":{"begin":66,"end":79},"obj":"Chemical"},{"id":"T63863","span":{"begin":160,"end":169},"obj":"Chemical"},{"id":"T35583","span":{"begin":188,"end":195},"obj":"Chemical"},{"id":"T77933","span":{"begin":221,"end":228},"obj":"Chemical"},{"id":"T34988","span":{"begin":252,"end":260},"obj":"Chemical"},{"id":"T251","span":{"begin":323,"end":330},"obj":"Chemical"},{"id":"T91387","span":{"begin":412,"end":419},"obj":"Chemical"},{"id":"T253","span":{"begin":486,"end":493},"obj":"Chemical"},{"id":"T254","span":{"begin":586,"end":594},"obj":"Chemical"},{"id":"T255","span":{"begin":661,"end":678},"obj":"Chemical"},{"id":"T256","span":{"begin":680,"end":683},"obj":"Chemical"},{"id":"T79623","span":{"begin":694,"end":702},"obj":"Chemical"},{"id":"T71826","span":{"begin":798,"end":800},"obj":"Chemical"},{"id":"T18567","span":{"begin":813,"end":816},"obj":"Chemical"},{"id":"T80092","span":{"begin":827,"end":829},"obj":"Chemical"},{"id":"T27911","span":{"begin":830,"end":833},"obj":"Chemical"},{"id":"T57873","span":{"begin":855,"end":870},"obj":"Chemical"},{"id":"T87972","span":{"begin":888,"end":894},"obj":"Chemical"},{"id":"T80138","span":{"begin":898,"end":901},"obj":"Chemical"},{"id":"T73878","span":{"begin":905,"end":908},"obj":"Chemical"},{"id":"T54412","span":{"begin":912,"end":915},"obj":"Chemical"},{"id":"T32519","span":{"begin":919,"end":925},"obj":"Chemical"},{"id":"T84324","span":{"begin":960,"end":962},"obj":"Chemical"},{"id":"T33895","span":{"begin":963,"end":966},"obj":"Chemical"},{"id":"T68117","span":{"begin":991,"end":993},"obj":"Chemical"},{"id":"T13587","span":{"begin":1032,"end":1034},"obj":"Chemical"},{"id":"T20790","span":{"begin":1068,"end":1070},"obj":"Chemical"},{"id":"T74944","span":{"begin":1076,"end":1091},"obj":"Chemical"},{"id":"T12927","span":{"begin":1076,"end":1083},"obj":"Chemical"},{"id":"T280","span":{"begin":1084,"end":1091},"obj":"Chemical"},{"id":"T24928","span":{"begin":1114,"end":1117},"obj":"Chemical"},{"id":"T88817","span":{"begin":1364,"end":1366},"obj":"Chemical"},{"id":"T284","span":{"begin":1371,"end":1390},"obj":"Chemical"},{"id":"T285","span":{"begin":1383,"end":1390},"obj":"Chemical"},{"id":"T5029","span":{"begin":1391,"end":1394},"obj":"Chemical"},{"id":"T13455","span":{"begin":1512,"end":1519},"obj":"Chemical"},{"id":"T289","span":{"begin":1575,"end":1582},"obj":"Chemical"}],"attributes":[{"id":"A5838","pred":"chebi_id","subj":"T243","obj":"http://purl.obolibrary.org/obo/CHEBI_28815"},{"id":"A25752","pred":"chebi_id","subj":"T244","obj":"http://purl.obolibrary.org/obo/CHEBI_24500"},{"id":"A56619","pred":"chebi_id","subj":"T245","obj":"http://purl.obolibrary.org/obo/CHEBI_16189"},{"id":"A32182","pred":"chebi_id","subj":"T246","obj":"http://purl.obolibrary.org/obo/CHEBI_37396"},{"id":"A82492","pred":"chebi_id","subj":"T63863","obj":"http://purl.obolibrary.org/obo/CHEBI_25367"},{"id":"A76107","pred":"chebi_id","subj":"T35583","obj":"http://purl.obolibrary.org/obo/CHEBI_36080"},{"id":"A84734","pred":"chebi_id","subj":"T77933","obj":"http://purl.obolibrary.org/obo/CHEBI_36080"},{"id":"A6931","pred":"chebi_id","subj":"T34988","obj":"http://purl.obolibrary.org/obo/CHEBI_36080"},{"id":"A85883","pred":"chebi_id","subj":"T251","obj":"http://purl.obolibrary.org/obo/CHEBI_36080"},{"id":"A93004","pred":"chebi_id","subj":"T91387","obj":"http://purl.obolibrary.org/obo/CHEBI_36080"},{"id":"A56952","pred":"chebi_id","subj":"T253","obj":"http://purl.obolibrary.org/obo/CHEBI_36080"},{"id":"A29606","pred":"chebi_id","subj":"T254","obj":"http://purl.obolibrary.org/obo/CHEBI_36080"},{"id":"A43771","pred":"chebi_id","subj":"T255","obj":"http://purl.obolibrary.org/obo/CHEBI_18085"},{"id":"A2009","pred":"chebi_id","subj":"T256","obj":"http://purl.obolibrary.org/obo/CHEBI_143889"},{"id":"A91596","pred":"chebi_id","subj":"T256","obj":"http://purl.obolibrary.org/obo/CHEBI_18085"},{"id":"A39412","pred":"chebi_id","subj":"T79623","obj":"http://purl.obolibrary.org/obo/CHEBI_36080"},{"id":"A56429","pred":"chebi_id","subj":"T71826","obj":"http://purl.obolibrary.org/obo/CHEBI_74056"},{"id":"A83842","pred":"chebi_id","subj":"T18567","obj":"http://purl.obolibrary.org/obo/CHEBI_143889"},{"id":"A26406","pred":"chebi_id","subj":"T18567","obj":"http://purl.obolibrary.org/obo/CHEBI_18085"},{"id":"A8140","pred":"chebi_id","subj":"T80092","obj":"http://purl.obolibrary.org/obo/CHEBI_74056"},{"id":"A50218","pred":"chebi_id","subj":"T27911","obj":"http://purl.obolibrary.org/obo/CHEBI_143889"},{"id":"A63903","pred":"chebi_id","subj":"T27911","obj":"http://purl.obolibrary.org/obo/CHEBI_18085"},{"id":"A72293","pred":"chebi_id","subj":"T57873","obj":"http://purl.obolibrary.org/obo/CHEBI_50126"},{"id":"A39634","pred":"chebi_id","subj":"T87972","obj":"http://purl.obolibrary.org/obo/CHEBI_506227"},{"id":"A65139","pred":"chebi_id","subj":"T87972","obj":"http://purl.obolibrary.org/obo/CHEBI_73685"},{"id":"A45298","pred":"chebi_id","subj":"T80138","obj":"http://purl.obolibrary.org/obo/CHEBI_28260"},{"id":"A77021","pred":"chebi_id","subj":"T73878","obj":"http://purl.obolibrary.org/obo/CHEBI_28260"},{"id":"A59970","pred":"chebi_id","subj":"T54412","obj":"http://purl.obolibrary.org/obo/CHEBI_18222"},{"id":"A13991","pred":"chebi_id","subj":"T32519","obj":"http://purl.obolibrary.org/obo/CHEBI_17822"},{"id":"A99715","pred":"chebi_id","subj":"T84324","obj":"http://purl.obolibrary.org/obo/CHEBI_74056"},{"id":"A6378","pred":"chebi_id","subj":"T33895","obj":"http://purl.obolibrary.org/obo/CHEBI_143889"},{"id":"A42998","pred":"chebi_id","subj":"T33895","obj":"http://purl.obolibrary.org/obo/CHEBI_18085"},{"id":"A46922","pred":"chebi_id","subj":"T68117","obj":"http://purl.obolibrary.org/obo/CHEBI_74067"},{"id":"A63255","pred":"chebi_id","subj":"T13587","obj":"http://purl.obolibrary.org/obo/CHEBI_74067"},{"id":"A98320","pred":"chebi_id","subj":"T20790","obj":"http://purl.obolibrary.org/obo/CHEBI_74067"},{"id":"A15052","pred":"chebi_id","subj":"T74944","obj":"http://purl.obolibrary.org/obo/CHEBI_28815"},{"id":"A88144","pred":"chebi_id","subj":"T12927","obj":"http://purl.obolibrary.org/obo/CHEBI_24500"},{"id":"A36168","pred":"chebi_id","subj":"T280","obj":"http://purl.obolibrary.org/obo/CHEBI_16189"},{"id":"A51301","pred":"chebi_id","subj":"T24928","obj":"http://purl.obolibrary.org/obo/CHEBI_143889"},{"id":"A30876","pred":"chebi_id","subj":"T24928","obj":"http://purl.obolibrary.org/obo/CHEBI_18085"},{"id":"A75641","pred":"chebi_id","subj":"T88817","obj":"http://purl.obolibrary.org/obo/CHEBI_74056"},{"id":"A2787","pred":"chebi_id","subj":"T284","obj":"http://purl.obolibrary.org/obo/CHEBI_37397"},{"id":"A35089","pred":"chebi_id","subj":"T285","obj":"http://purl.obolibrary.org/obo/CHEBI_16189"},{"id":"A45828","pred":"chebi_id","subj":"T5029","obj":"http://purl.obolibrary.org/obo/CHEBI_143889"},{"id":"A68238","pred":"chebi_id","subj":"T5029","obj":"http://purl.obolibrary.org/obo/CHEBI_18085"},{"id":"A17305","pred":"chebi_id","subj":"T13455","obj":"http://purl.obolibrary.org/obo/CHEBI_52214"},{"id":"A2362","pred":"chebi_id","subj":"T289","obj":"http://purl.obolibrary.org/obo/CHEBI_52214"}],"text":"For glycan interaction, HCoV-NL63 and MHV utilize heparan sulfate proteoglycans (HSPGs) as attachment enhancers [87,124]. Viruses recognize HSPGs as attachment molecules. In the spike (S) protein-deficient virions, the M protein recognizes HSPG. The S proteins generally bind to the viral cellular receptor. However, the M protein also acts as a receptor in the early step of HCoV-NL63 infection. The M membrane protein of HCoV-NL63 recognizes the attachment site of HSPGs. HCoV-NL63 M protein binds to HSPG for the initial attachment of virus to host cells and thereafter, the M and S proteins cooperate for virus entrance into the host cells [125]. HSPGs are glycosaminoglycan (GAG)-carrying proteins frequently used as a secondary receptor for viral entry. HSPGs are composed of covalent-bonded HS chains as a GAG form. The HS GAG linkage structure of tetrasaccharide exhibits GluAβ1,3GlcNAcα1,4Galβ1,3Galβ1,4Xylβ-O-serine. Glycosyltransferases involved in HS GAG synthesis include GlcAT-II (glucuronosyltransferase) and GlcNAcT-II (N-acetylglucosaminyltransferase II) for heparan sulfate synthesis (Figure 9). GAG is used as docking sites for virus interaction with the host cell surface. GAGs contain negatively charged N- and O-sulfated sugars [126]. The biosynthetic pathway and biologic roles in early embryogenic morphogenesis and vulval morphogenesis of HS and chondroitin sulfate GAG have been elucidated in Caenorhabditis elegans [127]. The negative charges mediate the interaction of GAGs and their ligands through electrostatic forces. Interaction of HSPG with ligands potentiates many virus infectious cycles. For examples, adeno-associated virus, human T cell lymphotropic virus type 1, human papilloma virus 16, herpes viruses, hepatitis B and C viruses, Kaposi’s sarcoma-associated herpesvirus, human papilloma viruses and Merkel cell polyoma virus recognize the HSPGs [128,129]. HSPGs increase virulence upon interaction with viral factors required for viral attachment and replication."}
LitCovid-PD-GO-BP
{"project":"LitCovid-PD-GO-BP","denotations":[{"id":"T102","span":{"begin":967,"end":976},"obj":"http://purl.obolibrary.org/obo/GO_0009058"},{"id":"T103","span":{"begin":1092,"end":1101},"obj":"http://purl.obolibrary.org/obo/GO_0009058"},{"id":"T104","span":{"begin":1153,"end":1178},"obj":"http://purl.obolibrary.org/obo/GO_0051701"},{"id":"T105","span":{"begin":1322,"end":1335},"obj":"http://purl.obolibrary.org/obo/GO_0009653"},{"id":"T106","span":{"begin":1347,"end":1360},"obj":"http://purl.obolibrary.org/obo/GO_0009653"},{"id":"T107","span":{"begin":1913,"end":1922},"obj":"http://purl.obolibrary.org/obo/GO_0016032"},{"id":"T108","span":{"begin":1913,"end":1922},"obj":"http://purl.obolibrary.org/obo/GO_0009405"}],"text":"For glycan interaction, HCoV-NL63 and MHV utilize heparan sulfate proteoglycans (HSPGs) as attachment enhancers [87,124]. Viruses recognize HSPGs as attachment molecules. In the spike (S) protein-deficient virions, the M protein recognizes HSPG. The S proteins generally bind to the viral cellular receptor. However, the M protein also acts as a receptor in the early step of HCoV-NL63 infection. The M membrane protein of HCoV-NL63 recognizes the attachment site of HSPGs. HCoV-NL63 M protein binds to HSPG for the initial attachment of virus to host cells and thereafter, the M and S proteins cooperate for virus entrance into the host cells [125]. HSPGs are glycosaminoglycan (GAG)-carrying proteins frequently used as a secondary receptor for viral entry. HSPGs are composed of covalent-bonded HS chains as a GAG form. The HS GAG linkage structure of tetrasaccharide exhibits GluAβ1,3GlcNAcα1,4Galβ1,3Galβ1,4Xylβ-O-serine. Glycosyltransferases involved in HS GAG synthesis include GlcAT-II (glucuronosyltransferase) and GlcNAcT-II (N-acetylglucosaminyltransferase II) for heparan sulfate synthesis (Figure 9). GAG is used as docking sites for virus interaction with the host cell surface. GAGs contain negatively charged N- and O-sulfated sugars [126]. The biosynthetic pathway and biologic roles in early embryogenic morphogenesis and vulval morphogenesis of HS and chondroitin sulfate GAG have been elucidated in Caenorhabditis elegans [127]. The negative charges mediate the interaction of GAGs and their ligands through electrostatic forces. Interaction of HSPG with ligands potentiates many virus infectious cycles. For examples, adeno-associated virus, human T cell lymphotropic virus type 1, human papilloma virus 16, herpes viruses, hepatitis B and C viruses, Kaposi’s sarcoma-associated herpesvirus, human papilloma viruses and Merkel cell polyoma virus recognize the HSPGs [128,129]. HSPGs increase virulence upon interaction with viral factors required for viral attachment and replication."}
LitCovid-sentences
{"project":"LitCovid-sentences","denotations":[{"id":"T599","span":{"begin":0,"end":121},"obj":"Sentence"},{"id":"T600","span":{"begin":122,"end":170},"obj":"Sentence"},{"id":"T601","span":{"begin":171,"end":245},"obj":"Sentence"},{"id":"T602","span":{"begin":246,"end":307},"obj":"Sentence"},{"id":"T603","span":{"begin":308,"end":396},"obj":"Sentence"},{"id":"T604","span":{"begin":397,"end":473},"obj":"Sentence"},{"id":"T605","span":{"begin":474,"end":650},"obj":"Sentence"},{"id":"T606","span":{"begin":651,"end":759},"obj":"Sentence"},{"id":"T607","span":{"begin":760,"end":822},"obj":"Sentence"},{"id":"T608","span":{"begin":823,"end":926},"obj":"Sentence"},{"id":"T609","span":{"begin":927,"end":1113},"obj":"Sentence"},{"id":"T610","span":{"begin":1114,"end":1192},"obj":"Sentence"},{"id":"T611","span":{"begin":1193,"end":1256},"obj":"Sentence"},{"id":"T612","span":{"begin":1257,"end":1448},"obj":"Sentence"},{"id":"T613","span":{"begin":1449,"end":1549},"obj":"Sentence"},{"id":"T614","span":{"begin":1550,"end":1624},"obj":"Sentence"},{"id":"T615","span":{"begin":1625,"end":1897},"obj":"Sentence"},{"id":"T616","span":{"begin":1898,"end":2005},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"For glycan interaction, HCoV-NL63 and MHV utilize heparan sulfate proteoglycans (HSPGs) as attachment enhancers [87,124]. Viruses recognize HSPGs as attachment molecules. In the spike (S) protein-deficient virions, the M protein recognizes HSPG. The S proteins generally bind to the viral cellular receptor. However, the M protein also acts as a receptor in the early step of HCoV-NL63 infection. The M membrane protein of HCoV-NL63 recognizes the attachment site of HSPGs. HCoV-NL63 M protein binds to HSPG for the initial attachment of virus to host cells and thereafter, the M and S proteins cooperate for virus entrance into the host cells [125]. HSPGs are glycosaminoglycan (GAG)-carrying proteins frequently used as a secondary receptor for viral entry. HSPGs are composed of covalent-bonded HS chains as a GAG form. The HS GAG linkage structure of tetrasaccharide exhibits GluAβ1,3GlcNAcα1,4Galβ1,3Galβ1,4Xylβ-O-serine. Glycosyltransferases involved in HS GAG synthesis include GlcAT-II (glucuronosyltransferase) and GlcNAcT-II (N-acetylglucosaminyltransferase II) for heparan sulfate synthesis (Figure 9). GAG is used as docking sites for virus interaction with the host cell surface. GAGs contain negatively charged N- and O-sulfated sugars [126]. The biosynthetic pathway and biologic roles in early embryogenic morphogenesis and vulval morphogenesis of HS and chondroitin sulfate GAG have been elucidated in Caenorhabditis elegans [127]. The negative charges mediate the interaction of GAGs and their ligands through electrostatic forces. Interaction of HSPG with ligands potentiates many virus infectious cycles. For examples, adeno-associated virus, human T cell lymphotropic virus type 1, human papilloma virus 16, herpes viruses, hepatitis B and C viruses, Kaposi’s sarcoma-associated herpesvirus, human papilloma viruses and Merkel cell polyoma virus recognize the HSPGs [128,129]. HSPGs increase virulence upon interaction with viral factors required for viral attachment and replication."}
LitCovid-PD-GlycoEpitope
{"project":"LitCovid-PD-GlycoEpitope","denotations":[{"id":"T7","span":{"begin":50,"end":65},"obj":"GlycoEpitope"},{"id":"T8","span":{"begin":798,"end":800},"obj":"GlycoEpitope"},{"id":"T9","span":{"begin":827,"end":829},"obj":"GlycoEpitope"},{"id":"T10","span":{"begin":960,"end":962},"obj":"GlycoEpitope"},{"id":"T11","span":{"begin":1076,"end":1091},"obj":"GlycoEpitope"},{"id":"T12","span":{"begin":1364,"end":1366},"obj":"GlycoEpitope"},{"id":"T13","span":{"begin":1371,"end":1382},"obj":"GlycoEpitope"}],"attributes":[{"id":"A7","pred":"glyco_epitope_db_id","subj":"T7","obj":"http://www.glycoepitope.jp/epitopes/EP0086"},{"id":"A8","pred":"glyco_epitope_db_id","subj":"T8","obj":"http://www.glycoepitope.jp/epitopes/EP0086"},{"id":"A9","pred":"glyco_epitope_db_id","subj":"T9","obj":"http://www.glycoepitope.jp/epitopes/EP0086"},{"id":"A10","pred":"glyco_epitope_db_id","subj":"T10","obj":"http://www.glycoepitope.jp/epitopes/EP0086"},{"id":"A11","pred":"glyco_epitope_db_id","subj":"T11","obj":"http://www.glycoepitope.jp/epitopes/EP0086"},{"id":"A12","pred":"glyco_epitope_db_id","subj":"T12","obj":"http://www.glycoepitope.jp/epitopes/EP0086"},{"id":"A13","pred":"glyco_epitope_db_id","subj":"T13","obj":"http://www.glycoepitope.jp/epitopes/EP0081"}],"text":"For glycan interaction, HCoV-NL63 and MHV utilize heparan sulfate proteoglycans (HSPGs) as attachment enhancers [87,124]. Viruses recognize HSPGs as attachment molecules. In the spike (S) protein-deficient virions, the M protein recognizes HSPG. The S proteins generally bind to the viral cellular receptor. However, the M protein also acts as a receptor in the early step of HCoV-NL63 infection. The M membrane protein of HCoV-NL63 recognizes the attachment site of HSPGs. HCoV-NL63 M protein binds to HSPG for the initial attachment of virus to host cells and thereafter, the M and S proteins cooperate for virus entrance into the host cells [125]. HSPGs are glycosaminoglycan (GAG)-carrying proteins frequently used as a secondary receptor for viral entry. HSPGs are composed of covalent-bonded HS chains as a GAG form. The HS GAG linkage structure of tetrasaccharide exhibits GluAβ1,3GlcNAcα1,4Galβ1,3Galβ1,4Xylβ-O-serine. Glycosyltransferases involved in HS GAG synthesis include GlcAT-II (glucuronosyltransferase) and GlcNAcT-II (N-acetylglucosaminyltransferase II) for heparan sulfate synthesis (Figure 9). GAG is used as docking sites for virus interaction with the host cell surface. GAGs contain negatively charged N- and O-sulfated sugars [126]. The biosynthetic pathway and biologic roles in early embryogenic morphogenesis and vulval morphogenesis of HS and chondroitin sulfate GAG have been elucidated in Caenorhabditis elegans [127]. The negative charges mediate the interaction of GAGs and their ligands through electrostatic forces. Interaction of HSPG with ligands potentiates many virus infectious cycles. For examples, adeno-associated virus, human T cell lymphotropic virus type 1, human papilloma virus 16, herpes viruses, hepatitis B and C viruses, Kaposi’s sarcoma-associated herpesvirus, human papilloma viruses and Merkel cell polyoma virus recognize the HSPGs [128,129]. HSPGs increase virulence upon interaction with viral factors required for viral attachment and replication."}
2_test
{"project":"2_test","denotations":[{"id":"32604730-25187545-51944087","span":{"begin":113,"end":115},"obj":"25187545"},{"id":"32604730-17692355-51944088","span":{"begin":116,"end":119},"obj":"17692355"},{"id":"32604730-31315999-51944089","span":{"begin":645,"end":648},"obj":"31315999"},{"id":"32604730-12369092-51944090","span":{"begin":1251,"end":1254},"obj":"12369092"},{"id":"32604730-12761549-51944091","span":{"begin":1443,"end":1446},"obj":"12761549"},{"id":"32604730-11507222-51944092","span":{"begin":1888,"end":1891},"obj":"11507222"},{"id":"32604730-11518721-51944093","span":{"begin":1892,"end":1895},"obj":"11518721"},{"id":"T42843","span":{"begin":113,"end":115},"obj":"25187545"},{"id":"T53854","span":{"begin":116,"end":119},"obj":"17692355"},{"id":"T94580","span":{"begin":645,"end":648},"obj":"31315999"},{"id":"T83893","span":{"begin":1251,"end":1254},"obj":"12369092"},{"id":"T73934","span":{"begin":1443,"end":1446},"obj":"12761549"},{"id":"T91960","span":{"begin":1888,"end":1891},"obj":"11507222"},{"id":"T65288","span":{"begin":1892,"end":1895},"obj":"11518721"}],"text":"For glycan interaction, HCoV-NL63 and MHV utilize heparan sulfate proteoglycans (HSPGs) as attachment enhancers [87,124]. Viruses recognize HSPGs as attachment molecules. In the spike (S) protein-deficient virions, the M protein recognizes HSPG. The S proteins generally bind to the viral cellular receptor. However, the M protein also acts as a receptor in the early step of HCoV-NL63 infection. The M membrane protein of HCoV-NL63 recognizes the attachment site of HSPGs. HCoV-NL63 M protein binds to HSPG for the initial attachment of virus to host cells and thereafter, the M and S proteins cooperate for virus entrance into the host cells [125]. HSPGs are glycosaminoglycan (GAG)-carrying proteins frequently used as a secondary receptor for viral entry. HSPGs are composed of covalent-bonded HS chains as a GAG form. The HS GAG linkage structure of tetrasaccharide exhibits GluAβ1,3GlcNAcα1,4Galβ1,3Galβ1,4Xylβ-O-serine. Glycosyltransferases involved in HS GAG synthesis include GlcAT-II (glucuronosyltransferase) and GlcNAcT-II (N-acetylglucosaminyltransferase II) for heparan sulfate synthesis (Figure 9). GAG is used as docking sites for virus interaction with the host cell surface. GAGs contain negatively charged N- and O-sulfated sugars [126]. The biosynthetic pathway and biologic roles in early embryogenic morphogenesis and vulval morphogenesis of HS and chondroitin sulfate GAG have been elucidated in Caenorhabditis elegans [127]. The negative charges mediate the interaction of GAGs and their ligands through electrostatic forces. Interaction of HSPG with ligands potentiates many virus infectious cycles. For examples, adeno-associated virus, human T cell lymphotropic virus type 1, human papilloma virus 16, herpes viruses, hepatitis B and C viruses, Kaposi’s sarcoma-associated herpesvirus, human papilloma viruses and Merkel cell polyoma virus recognize the HSPGs [128,129]. HSPGs increase virulence upon interaction with viral factors required for viral attachment and replication."}
LitCovid-PD-HP
{"project":"LitCovid-PD-HP","denotations":[{"id":"T20","span":{"begin":1709,"end":1718},"obj":"Phenotype"},{"id":"T21","span":{"begin":1745,"end":1754},"obj":"Phenotype"},{"id":"T22","span":{"begin":1772,"end":1788},"obj":"Phenotype"},{"id":"T23","span":{"begin":1819,"end":1828},"obj":"Phenotype"}],"attributes":[{"id":"A20","pred":"hp_id","subj":"T20","obj":"http://purl.obolibrary.org/obo/HP_0012740"},{"id":"A21","pred":"hp_id","subj":"T21","obj":"http://purl.obolibrary.org/obo/HP_0012115"},{"id":"A22","pred":"hp_id","subj":"T22","obj":"http://purl.obolibrary.org/obo/HP_0100726"},{"id":"A23","pred":"hp_id","subj":"T23","obj":"http://purl.obolibrary.org/obo/HP_0012740"}],"text":"For glycan interaction, HCoV-NL63 and MHV utilize heparan sulfate proteoglycans (HSPGs) as attachment enhancers [87,124]. Viruses recognize HSPGs as attachment molecules. In the spike (S) protein-deficient virions, the M protein recognizes HSPG. The S proteins generally bind to the viral cellular receptor. However, the M protein also acts as a receptor in the early step of HCoV-NL63 infection. The M membrane protein of HCoV-NL63 recognizes the attachment site of HSPGs. HCoV-NL63 M protein binds to HSPG for the initial attachment of virus to host cells and thereafter, the M and S proteins cooperate for virus entrance into the host cells [125]. HSPGs are glycosaminoglycan (GAG)-carrying proteins frequently used as a secondary receptor for viral entry. HSPGs are composed of covalent-bonded HS chains as a GAG form. The HS GAG linkage structure of tetrasaccharide exhibits GluAβ1,3GlcNAcα1,4Galβ1,3Galβ1,4Xylβ-O-serine. Glycosyltransferases involved in HS GAG synthesis include GlcAT-II (glucuronosyltransferase) and GlcNAcT-II (N-acetylglucosaminyltransferase II) for heparan sulfate synthesis (Figure 9). GAG is used as docking sites for virus interaction with the host cell surface. GAGs contain negatively charged N- and O-sulfated sugars [126]. The biosynthetic pathway and biologic roles in early embryogenic morphogenesis and vulval morphogenesis of HS and chondroitin sulfate GAG have been elucidated in Caenorhabditis elegans [127]. The negative charges mediate the interaction of GAGs and their ligands through electrostatic forces. Interaction of HSPG with ligands potentiates many virus infectious cycles. For examples, adeno-associated virus, human T cell lymphotropic virus type 1, human papilloma virus 16, herpes viruses, hepatitis B and C viruses, Kaposi’s sarcoma-associated herpesvirus, human papilloma viruses and Merkel cell polyoma virus recognize the HSPGs [128,129]. HSPGs increase virulence upon interaction with viral factors required for viral attachment and replication."}