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The first step in mucin-type O-glycosylation is catalyzed by UDP N-acetylgalactosamine (GalNAc):polypeptide GalNAc transferases (EC Each member of this large enzyme family has a unique substrate specificity and expression profile. GALNT9 belongs to a subfamily of GALNTs found only in vertebrates. Other members of this subfamily include GALNT8 (606250), GALNT19 (615137), and GALNT18 (615136). Due to critical substitutions in a conserved catalytic motif, members of this subfamily lack significant GalNAc transferase activity (Li et al., 2012). ###Copied from OMIM###
O-glycan Tn-antigen mucin tumor marker

UDP-GalNAc:polypeptide N-acetylgalactosaminyltransferase

Alias GALNAC-T9    details
DesignationUDP-GalNAc:polypeptide N-acetylgalactosaminyltransferase 9
OrganismHomo sapiens
GeneID 50614
HGNC 4131
mRNA AB040672       (CDS)
Protein BAB13699       (CDS)
CAZy GT27   
OMIM 606251   
This page does not indicate all of the enzymatic reaction, and expression of "GALNT9".