FB2026_03 , released September 17, 2026
CV Term Report
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General Information
Term xylosylprotein 4-beta-galactosyltransferase activity ID (Ontology) GO:0046525 (Gene Ontology)
Definition Catalysis of the reaction: UDP-galactose + O-beta-D-xylosylprotein = UDP + 4-beta-D-galactosyl-O-beta-D-xylosylprotein.[ EC:2 ]
Also Known As"UDP-galactose:xylose galactosyltransferase activity"
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Genes (FBgn)GO_MOLECULAR_FUNCTION
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 Genes
 xylosylprotein 4-beta-galactosyltransferase activity (all annotations which use CV term, excluding "NOT" statements)
     enables | xylosylprotein 4-beta-galactosyltransferase activity
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UDP-glycosyltransferase activity
 |__UDP-galactosyltransferase activity____________
galactosyltransferase activity                    |
 |__UDP-galactosyltransferase activity____________|
catalytic activity, acting on a protein           |
 |__catalytic activity, acting on a glycoprotein__|
                                                  xylosylprotein 4-beta-galactosyltransferase activity  1 rec.
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Is a UDP-galactosyltransferase activity
catalytic activity, acting on a glycoprotein
Part of
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Synonyms
  • "galactosyltransferase I activity" RELATED[ EC:2 ]
    "UDP-D-galactose:D-xylose galactosyltransferase activity" RELATED[ EC:2 ]
    "UDP-D-galactose:xylose galactosyltransferase activity" RELATED[ EC:2 ]
    "UDP-galactose:O-beta-D-xylosylprotein 4-beta-D-galactosyltransferase activity" RELATED[ EC:2 ]
    "UDP-galactose:xylose galactosyltransferase activity" EXACT
    "UDPgalactose:O-beta-D-xylosylprotein 4-beta-D-galactosyltransferase activity" RELATED[ EC:2 ]
    "uridine diphosphogalactose-xylose galactosyltransferase activity" RELATED[ EC:2 ]
Secondary IDs
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EC:2.4.1.133
MetaCyc:2.4.1.133-RXN
Reactome:R-HSA-1889981 "B4GALT7 transfers Gal group to xylosyl-unit of the tetrasaccharide linker"
Reactome:R-HSA-3560804 "Defective B4GALT7 does not transfer Gal to xylosyl-unit of the tetrasaccharide linker"
RHEA:15297