PubMed:3089603 JSONTXT

{"project":"GlyCosmos6-Glycan-Motif-Image","denotations":[{"id":"T1","span":{"begin":668,"end":687},"obj":"Glycan_Motif"},{"id":"T2","span":{"begin":810,"end":829},"obj":"Glycan_Motif"}],"attributes":[{"id":"A1","pred":"image","subj":"T1","obj":"https://api.glycosmos.org/wurcs2image/0.10.0/png/binary/G00055MO"},{"id":"A2","pred":"image","subj":"T2","obj":"https://api.glycosmos.org/wurcs2image/0.10.0/png/binary/G00055MO"}],"text":"The modulation of bovine milk D-galactosyltransferase by various phosphatidylethanolamines.\nTo investigate the possible role of nonbilayer phases in the modulation of glycosyltransferase activity, bovine milk D-galactosyltransferase has been studied in phosphatidylethanolamine (PE) membranes, including soybean PE, egg PE, PE prepared by transphosphatidylation of egg PC, bovine brain PE, plasmalogen PE, and DPPE. The gel-to-liquid crystalline transition (TC) and the lamellar-to-hexagonal transitions (TH) are known for most of the PE compounds. The lower the TC (or TH) value, the greater the stimulation of galactosyltransferase activity in both the lactose- and N-acetyllactosamine-synthetase reactions. No correlation was found between either TC or TH value and the break in the Arrhenius plots for the N-acetyllactosamine synthetase. In membranes consisting of mixtures of PE with PC, the dominant effect was that of PC. The stimulation of activity in the mixed-lipid systems was never greater than that produced by PC alone, therefore the enzyme showed a definite preference for PC in the mixtures."}

{"project":"GlyCosmos6-Glycan-Motif-Structure","denotations":[{"id":"T1","span":{"begin":668,"end":687},"obj":"https://glytoucan.org/Structures/Glycans/G00055MO"},{"id":"T2","span":{"begin":810,"end":829},"obj":"https://glytoucan.org/Structures/Glycans/G00055MO"}],"text":"The modulation of bovine milk D-galactosyltransferase by various phosphatidylethanolamines.\nTo investigate the possible role of nonbilayer phases in the modulation of glycosyltransferase activity, bovine milk D-galactosyltransferase has been studied in phosphatidylethanolamine (PE) membranes, including soybean PE, egg PE, PE prepared by transphosphatidylation of egg PC, bovine brain PE, plasmalogen PE, and DPPE. The gel-to-liquid crystalline transition (TC) and the lamellar-to-hexagonal transitions (TH) are known for most of the PE compounds. The lower the TC (or TH) value, the greater the stimulation of galactosyltransferase activity in both the lactose- and N-acetyllactosamine-synthetase reactions. No correlation was found between either TC or TH value and the break in the Arrhenius plots for the N-acetyllactosamine synthetase. In membranes consisting of mixtures of PE with PC, the dominant effect was that of PC. The stimulation of activity in the mixed-lipid systems was never greater than that produced by PC alone, therefore the enzyme showed a definite preference for PC in the mixtures."}

{"project":"sentences","denotations":[{"id":"TextSentencer_T1","span":{"begin":0,"end":91},"obj":"Sentence"},{"id":"TextSentencer_T2","span":{"begin":92,"end":415},"obj":"Sentence"},{"id":"TextSentencer_T3","span":{"begin":416,"end":548},"obj":"Sentence"},{"id":"TextSentencer_T4","span":{"begin":549,"end":709},"obj":"Sentence"},{"id":"TextSentencer_T5","span":{"begin":710,"end":841},"obj":"Sentence"},{"id":"TextSentencer_T6","span":{"begin":842,"end":928},"obj":"Sentence"},{"id":"TextSentencer_T7","span":{"begin":929,"end":1107},"obj":"Sentence"},{"id":"T1","span":{"begin":0,"end":91},"obj":"Sentence"},{"id":"T2","span":{"begin":92,"end":415},"obj":"Sentence"},{"id":"T3","span":{"begin":416,"end":548},"obj":"Sentence"},{"id":"T4","span":{"begin":549,"end":709},"obj":"Sentence"},{"id":"T5","span":{"begin":710,"end":841},"obj":"Sentence"},{"id":"T6","span":{"begin":842,"end":928},"obj":"Sentence"},{"id":"T7","span":{"begin":929,"end":1107},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"The modulation of bovine milk D-galactosyltransferase by various phosphatidylethanolamines.\nTo investigate the possible role of nonbilayer phases in the modulation of glycosyltransferase activity, bovine milk D-galactosyltransferase has been studied in phosphatidylethanolamine (PE) membranes, including soybean PE, egg PE, PE prepared by transphosphatidylation of egg PC, bovine brain PE, plasmalogen PE, and DPPE. The gel-to-liquid crystalline transition (TC) and the lamellar-to-hexagonal transitions (TH) are known for most of the PE compounds. The lower the TC (or TH) value, the greater the stimulation of galactosyltransferase activity in both the lactose- and N-acetyllactosamine-synthetase reactions. No correlation was found between either TC or TH value and the break in the Arrhenius plots for the N-acetyllactosamine synthetase. In membranes consisting of mixtures of PE with PC, the dominant effect was that of PC. The stimulation of activity in the mixed-lipid systems was never greater than that produced by PC alone, therefore the enzyme showed a definite preference for PC in the mixtures."}

{"project":"Glycosmos6-MAT","denotations":[{"id":"T1","span":{"begin":316,"end":319},"obj":"http://purl.obolibrary.org/obo/MAT_0000213"},{"id":"T2","span":{"begin":365,"end":368},"obj":"http://purl.obolibrary.org/obo/MAT_0000213"},{"id":"T3","span":{"begin":380,"end":385},"obj":"http://purl.obolibrary.org/obo/MAT_0000098"}],"text":"The modulation of bovine milk D-galactosyltransferase by various phosphatidylethanolamines.\nTo investigate the possible role of nonbilayer phases in the modulation of glycosyltransferase activity, bovine milk D-galactosyltransferase has been studied in phosphatidylethanolamine (PE) membranes, including soybean PE, egg PE, PE prepared by transphosphatidylation of egg PC, bovine brain PE, plasmalogen PE, and DPPE. The gel-to-liquid crystalline transition (TC) and the lamellar-to-hexagonal transitions (TH) are known for most of the PE compounds. The lower the TC (or TH) value, the greater the stimulation of galactosyltransferase activity in both the lactose- and N-acetyllactosamine-synthetase reactions. No correlation was found between either TC or TH value and the break in the Arrhenius plots for the N-acetyllactosamine synthetase. In membranes consisting of mixtures of PE with PC, the dominant effect was that of PC. The stimulation of activity in the mixed-lipid systems was never greater than that produced by PC alone, therefore the enzyme showed a definite preference for PC in the mixtures."}

{"project":"GlyCosmos15-Glycan","denotations":[{"id":"T1","span":{"begin":655,"end":662},"obj":"Glycan"}],"attributes":[{"id":"A1","pred":"glycosmos_id","subj":"T1","obj":"https://glycosmos.org/glycans/show/G15541SE"},{"id":"A2","pred":"image","subj":"T1","obj":"https://api.glycosmos.org/wurcs2image/latest/png/binary/G15541SE"}],"text":"The modulation of bovine milk D-galactosyltransferase by various phosphatidylethanolamines.\nTo investigate the possible role of nonbilayer phases in the modulation of glycosyltransferase activity, bovine milk D-galactosyltransferase has been studied in phosphatidylethanolamine (PE) membranes, including soybean PE, egg PE, PE prepared by transphosphatidylation of egg PC, bovine brain PE, plasmalogen PE, and DPPE. The gel-to-liquid crystalline transition (TC) and the lamellar-to-hexagonal transitions (TH) are known for most of the PE compounds. The lower the TC (or TH) value, the greater the stimulation of galactosyltransferase activity in both the lactose- and N-acetyllactosamine-synthetase reactions. No correlation was found between either TC or TH value and the break in the Arrhenius plots for the N-acetyllactosamine synthetase. In membranes consisting of mixtures of PE with PC, the dominant effect was that of PC. The stimulation of activity in the mixed-lipid systems was never greater than that produced by PC alone, therefore the enzyme showed a definite preference for PC in the mixtures."}

{"project":"Glycan-GlyCosmos","denotations":[{"id":"T1","span":{"begin":655,"end":662},"obj":"Glycan"}],"attributes":[{"id":"A1","pred":"glycosmos_id","subj":"T1","obj":"https://glycosmos.org/glycans/show/G15541SE"},{"id":"A2","pred":"image","subj":"T1","obj":"https://api.glycosmos.org/wurcs2image/latest/png/binary/G15541SE"}],"text":"The modulation of bovine milk D-galactosyltransferase by various phosphatidylethanolamines.\nTo investigate the possible role of nonbilayer phases in the modulation of glycosyltransferase activity, bovine milk D-galactosyltransferase has been studied in phosphatidylethanolamine (PE) membranes, including soybean PE, egg PE, PE prepared by transphosphatidylation of egg PC, bovine brain PE, plasmalogen PE, and DPPE. The gel-to-liquid crystalline transition (TC) and the lamellar-to-hexagonal transitions (TH) are known for most of the PE compounds. The lower the TC (or TH) value, the greater the stimulation of galactosyltransferase activity in both the lactose- and N-acetyllactosamine-synthetase reactions. No correlation was found between either TC or TH value and the break in the Arrhenius plots for the N-acetyllactosamine synthetase. In membranes consisting of mixtures of PE with PC, the dominant effect was that of PC. The stimulation of activity in the mixed-lipid systems was never greater than that produced by PC alone, therefore the enzyme showed a definite preference for PC in the mixtures."}

{"project":"GlyCosmos15-UBERON","denotations":[{"id":"T1","span":{"begin":25,"end":29},"obj":"Body_part"},{"id":"T2","span":{"begin":204,"end":208},"obj":"Body_part"},{"id":"T3","span":{"begin":283,"end":292},"obj":"Body_part"},{"id":"T4","span":{"begin":316,"end":319},"obj":"Body_part"},{"id":"T5","span":{"begin":365,"end":368},"obj":"Body_part"},{"id":"T6","span":{"begin":380,"end":385},"obj":"Body_part"},{"id":"T7","span":{"begin":845,"end":854},"obj":"Body_part"}],"attributes":[{"id":"A1","pred":"uberon_id","subj":"T1","obj":"http://purl.obolibrary.org/obo/UBERON_0001913"},{"id":"A2","pred":"uberon_id","subj":"T2","obj":"http://purl.obolibrary.org/obo/UBERON_0001913"},{"id":"A3","pred":"uberon_id","subj":"T3","obj":"http://purl.obolibrary.org/obo/UBERON_0000094"},{"id":"A4","pred":"uberon_id","subj":"T4","obj":"http://purl.obolibrary.org/obo/UBERON_0007379"},{"id":"A5","pred":"uberon_id","subj":"T5","obj":"http://purl.obolibrary.org/obo/UBERON_0007379"},{"id":"A6","pred":"uberon_id","subj":"T6","obj":"http://purl.obolibrary.org/obo/UBERON_0000955"},{"id":"A7","pred":"uberon_id","subj":"T7","obj":"http://purl.obolibrary.org/obo/UBERON_0000094"}],"text":"The modulation of bovine milk D-galactosyltransferase by various phosphatidylethanolamines.\nTo investigate the possible role of nonbilayer phases in the modulation of glycosyltransferase activity, bovine milk D-galactosyltransferase has been studied in phosphatidylethanolamine (PE) membranes, including soybean PE, egg PE, PE prepared by transphosphatidylation of egg PC, bovine brain PE, plasmalogen PE, and DPPE. The gel-to-liquid crystalline transition (TC) and the lamellar-to-hexagonal transitions (TH) are known for most of the PE compounds. The lower the TC (or TH) value, the greater the stimulation of galactosyltransferase activity in both the lactose- and N-acetyllactosamine-synthetase reactions. No correlation was found between either TC or TH value and the break in the Arrhenius plots for the N-acetyllactosamine synthetase. In membranes consisting of mixtures of PE with PC, the dominant effect was that of PC. The stimulation of activity in the mixed-lipid systems was never greater than that produced by PC alone, therefore the enzyme showed a definite preference for PC in the mixtures."}

{"project":"GlyCosmos15-Taxon","denotations":[{"id":"T1","span":{"begin":18,"end":24},"obj":"Organism"},{"id":"T2","span":{"begin":197,"end":203},"obj":"Organism"},{"id":"T3","span":{"begin":304,"end":311},"obj":"Organism"},{"id":"T4","span":{"begin":373,"end":379},"obj":"Organism"}],"attributes":[{"id":"A1","pred":"db_id","subj":"T1","obj":"9913"},{"id":"A2","pred":"db_id","subj":"T2","obj":"9913"},{"id":"A3","pred":"db_id","subj":"T3","obj":"3847"},{"id":"A4","pred":"db_id","subj":"T4","obj":"9913"}],"text":"The modulation of bovine milk D-galactosyltransferase by various phosphatidylethanolamines.\nTo investigate the possible role of nonbilayer phases in the modulation of glycosyltransferase activity, bovine milk D-galactosyltransferase has been studied in phosphatidylethanolamine (PE) membranes, including soybean PE, egg PE, PE prepared by transphosphatidylation of egg PC, bovine brain PE, plasmalogen PE, and DPPE. The gel-to-liquid crystalline transition (TC) and the lamellar-to-hexagonal transitions (TH) are known for most of the PE compounds. The lower the TC (or TH) value, the greater the stimulation of galactosyltransferase activity in both the lactose- and N-acetyllactosamine-synthetase reactions. No correlation was found between either TC or TH value and the break in the Arrhenius plots for the N-acetyllactosamine synthetase. In membranes consisting of mixtures of PE with PC, the dominant effect was that of PC. The stimulation of activity in the mixed-lipid systems was never greater than that produced by PC alone, therefore the enzyme showed a definite preference for PC in the mixtures."}

{"project":"GlyCosmos15-Sentences","blocks":[{"id":"T1","span":{"begin":0,"end":91},"obj":"Sentence"},{"id":"T2","span":{"begin":92,"end":415},"obj":"Sentence"},{"id":"T3","span":{"begin":416,"end":548},"obj":"Sentence"},{"id":"T4","span":{"begin":549,"end":709},"obj":"Sentence"},{"id":"T5","span":{"begin":710,"end":841},"obj":"Sentence"},{"id":"T6","span":{"begin":842,"end":928},"obj":"Sentence"},{"id":"T7","span":{"begin":929,"end":1107},"obj":"Sentence"}],"text":"The modulation of bovine milk D-galactosyltransferase by various phosphatidylethanolamines.\nTo investigate the possible role of nonbilayer phases in the modulation of glycosyltransferase activity, bovine milk D-galactosyltransferase has been studied in phosphatidylethanolamine (PE) membranes, including soybean PE, egg PE, PE prepared by transphosphatidylation of egg PC, bovine brain PE, plasmalogen PE, and DPPE. The gel-to-liquid crystalline transition (TC) and the lamellar-to-hexagonal transitions (TH) are known for most of the PE compounds. The lower the TC (or TH) value, the greater the stimulation of galactosyltransferase activity in both the lactose- and N-acetyllactosamine-synthetase reactions. No correlation was found between either TC or TH value and the break in the Arrhenius plots for the N-acetyllactosamine synthetase. In membranes consisting of mixtures of PE with PC, the dominant effect was that of PC. The stimulation of activity in the mixed-lipid systems was never greater than that produced by PC alone, therefore the enzyme showed a definite preference for PC in the mixtures."}

{"project":"GlyCosmos15-FMA","denotations":[{"id":"T1","span":{"begin":25,"end":29},"obj":"Body_part"},{"id":"T2","span":{"begin":204,"end":208},"obj":"Body_part"},{"id":"T3","span":{"begin":380,"end":385},"obj":"Body_part"}],"attributes":[{"id":"A1","pred":"db_id","subj":"T1","obj":"FMA:62100"},{"id":"A2","pred":"db_id","subj":"T2","obj":"FMA:62100"},{"id":"A3","pred":"db_id","subj":"T3","obj":"FMA:50801"}],"namespaces":[{"prefix":"FMA","uri":"http://purl.org/sig/ont/fma/fma"}],"text":"The modulation of bovine milk D-galactosyltransferase by various phosphatidylethanolamines.\nTo investigate the possible role of nonbilayer phases in the modulation of glycosyltransferase activity, bovine milk D-galactosyltransferase has been studied in phosphatidylethanolamine (PE) membranes, including soybean PE, egg PE, PE prepared by transphosphatidylation of egg PC, bovine brain PE, plasmalogen PE, and DPPE. The gel-to-liquid crystalline transition (TC) and the lamellar-to-hexagonal transitions (TH) are known for most of the PE compounds. The lower the TC (or TH) value, the greater the stimulation of galactosyltransferase activity in both the lactose- and N-acetyllactosamine-synthetase reactions. No correlation was found between either TC or TH value and the break in the Arrhenius plots for the N-acetyllactosamine synthetase. In membranes consisting of mixtures of PE with PC, the dominant effect was that of PC. The stimulation of activity in the mixed-lipid systems was never greater than that produced by PC alone, therefore the enzyme showed a definite preference for PC in the mixtures."}

{"project":"GlyCosmos15-MAT","denotations":[{"id":"T1","span":{"begin":316,"end":319},"obj":"Body_part"},{"id":"T2","span":{"begin":365,"end":368},"obj":"Body_part"},{"id":"T3","span":{"begin":380,"end":385},"obj":"Body_part"}],"attributes":[{"id":"A1","pred":"mat_id","subj":"T1","obj":"http://purl.obolibrary.org/obo/MAT_0000213"},{"id":"A2","pred":"mat_id","subj":"T2","obj":"http://purl.obolibrary.org/obo/MAT_0000213"},{"id":"A3","pred":"mat_id","subj":"T3","obj":"http://purl.obolibrary.org/obo/MAT_0000098"}],"text":"The modulation of bovine milk D-galactosyltransferase by various phosphatidylethanolamines.\nTo investigate the possible role of nonbilayer phases in the modulation of glycosyltransferase activity, bovine milk D-galactosyltransferase has been studied in phosphatidylethanolamine (PE) membranes, including soybean PE, egg PE, PE prepared by transphosphatidylation of egg PC, bovine brain PE, plasmalogen PE, and DPPE. The gel-to-liquid crystalline transition (TC) and the lamellar-to-hexagonal transitions (TH) are known for most of the PE compounds. The lower the TC (or TH) value, the greater the stimulation of galactosyltransferase activity in both the lactose- and N-acetyllactosamine-synthetase reactions. No correlation was found between either TC or TH value and the break in the Arrhenius plots for the N-acetyllactosamine synthetase. In membranes consisting of mixtures of PE with PC, the dominant effect was that of PC. The stimulation of activity in the mixed-lipid systems was never greater than that produced by PC alone, therefore the enzyme showed a definite preference for PC in the mixtures."}

{"project":"NCBITAXON","denotations":[{"id":"T1","span":{"begin":18,"end":24},"obj":"OrganismTaxon"},{"id":"T2","span":{"begin":197,"end":203},"obj":"OrganismTaxon"},{"id":"T3","span":{"begin":304,"end":311},"obj":"OrganismTaxon"},{"id":"T4","span":{"begin":373,"end":379},"obj":"OrganismTaxon"}],"attributes":[{"id":"A1","pred":"db_id","subj":"T1","obj":"9913"},{"id":"A2","pred":"db_id","subj":"T2","obj":"9913"},{"id":"A3","pred":"db_id","subj":"T3","obj":"3847"},{"id":"A4","pred":"db_id","subj":"T4","obj":"9913"}],"text":"The modulation of bovine milk D-galactosyltransferase by various phosphatidylethanolamines.\nTo investigate the possible role of nonbilayer phases in the modulation of glycosyltransferase activity, bovine milk D-galactosyltransferase has been studied in phosphatidylethanolamine (PE) membranes, including soybean PE, egg PE, PE prepared by transphosphatidylation of egg PC, bovine brain PE, plasmalogen PE, and DPPE. The gel-to-liquid crystalline transition (TC) and the lamellar-to-hexagonal transitions (TH) are known for most of the PE compounds. The lower the TC (or TH) value, the greater the stimulation of galactosyltransferase activity in both the lactose- and N-acetyllactosamine-synthetase reactions. No correlation was found between either TC or TH value and the break in the Arrhenius plots for the N-acetyllactosamine synthetase. In membranes consisting of mixtures of PE with PC, the dominant effect was that of PC. The stimulation of activity in the mixed-lipid systems was never greater than that produced by PC alone, therefore the enzyme showed a definite preference for PC in the mixtures."}

{"project":"Anatomy-UBERON","denotations":[{"id":"T1","span":{"begin":25,"end":29},"obj":"Body_part"},{"id":"T2","span":{"begin":204,"end":208},"obj":"Body_part"},{"id":"T3","span":{"begin":283,"end":292},"obj":"Body_part"},{"id":"T6","span":{"begin":316,"end":319},"obj":"Body_part"},{"id":"T7","span":{"begin":365,"end":368},"obj":"Body_part"},{"id":"T8","span":{"begin":380,"end":385},"obj":"Body_part"},{"id":"T10","span":{"begin":845,"end":854},"obj":"Body_part"}],"attributes":[{"id":"A1","pred":"uberon_id","subj":"T1","obj":"http://purl.obolibrary.org/obo/UBERON_0001913"},{"id":"A2","pred":"uberon_id","subj":"T2","obj":"http://purl.obolibrary.org/obo/UBERON_0001913"},{"id":"A3","pred":"uberon_id","subj":"T3","obj":"http://purl.obolibrary.org/obo/GO_0016020"},{"id":"A4","pred":"uberon_id","subj":"T3","obj":"http://purl.obolibrary.org/obo/UBERON_0000094"},{"id":"A5","pred":"uberon_id","subj":"T3","obj":"http://purl.obolibrary.org/obo/UBERON_0000158"},{"id":"A6","pred":"uberon_id","subj":"T6","obj":"http://purl.obolibrary.org/obo/UBERON_0007379"},{"id":"A7","pred":"uberon_id","subj":"T7","obj":"http://purl.obolibrary.org/obo/UBERON_0007379"},{"id":"A8","pred":"uberon_id","subj":"T8","obj":"http://purl.obolibrary.org/obo/UBERON_0000955"},{"id":"A9","pred":"uberon_id","subj":"T8","obj":"http://purl.obolibrary.org/obo/UBERON_6110636"},{"id":"A10","pred":"uberon_id","subj":"T10","obj":"http://purl.obolibrary.org/obo/GO_0016020"},{"id":"A11","pred":"uberon_id","subj":"T10","obj":"http://purl.obolibrary.org/obo/UBERON_0000094"},{"id":"A12","pred":"uberon_id","subj":"T10","obj":"http://purl.obolibrary.org/obo/UBERON_0000158"}],"text":"The modulation of bovine milk D-galactosyltransferase by various phosphatidylethanolamines.\nTo investigate the possible role of nonbilayer phases in the modulation of glycosyltransferase activity, bovine milk D-galactosyltransferase has been studied in phosphatidylethanolamine (PE) membranes, including soybean PE, egg PE, PE prepared by transphosphatidylation of egg PC, bovine brain PE, plasmalogen PE, and DPPE. The gel-to-liquid crystalline transition (TC) and the lamellar-to-hexagonal transitions (TH) are known for most of the PE compounds. The lower the TC (or TH) value, the greater the stimulation of galactosyltransferase activity in both the lactose- and N-acetyllactosamine-synthetase reactions. No correlation was found between either TC or TH value and the break in the Arrhenius plots for the N-acetyllactosamine synthetase. In membranes consisting of mixtures of PE with PC, the dominant effect was that of PC. The stimulation of activity in the mixed-lipid systems was never greater than that produced by PC alone, therefore the enzyme showed a definite preference for PC in the mixtures."}

{"project":"Anatomy-MAT","denotations":[{"id":"T1","span":{"begin":316,"end":319},"obj":"Body_part"},{"id":"T2","span":{"begin":365,"end":368},"obj":"Body_part"},{"id":"T3","span":{"begin":380,"end":385},"obj":"Body_part"}],"attributes":[{"id":"A1","pred":"mat_id","subj":"T1","obj":"http://purl.obolibrary.org/obo/MAT_0000213"},{"id":"A2","pred":"mat_id","subj":"T2","obj":"http://purl.obolibrary.org/obo/MAT_0000213"},{"id":"A3","pred":"mat_id","subj":"T3","obj":"http://purl.obolibrary.org/obo/MAT_0000098"}],"text":"The modulation of bovine milk D-galactosyltransferase by various phosphatidylethanolamines.\nTo investigate the possible role of nonbilayer phases in the modulation of glycosyltransferase activity, bovine milk D-galactosyltransferase has been studied in phosphatidylethanolamine (PE) membranes, including soybean PE, egg PE, PE prepared by transphosphatidylation of egg PC, bovine brain PE, plasmalogen PE, and DPPE. The gel-to-liquid crystalline transition (TC) and the lamellar-to-hexagonal transitions (TH) are known for most of the PE compounds. The lower the TC (or TH) value, the greater the stimulation of galactosyltransferase activity in both the lactose- and N-acetyllactosamine-synthetase reactions. No correlation was found between either TC or TH value and the break in the Arrhenius plots for the N-acetyllactosamine synthetase. In membranes consisting of mixtures of PE with PC, the dominant effect was that of PC. The stimulation of activity in the mixed-lipid systems was never greater than that produced by PC alone, therefore the enzyme showed a definite preference for PC in the mixtures."}