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This isozyme lacks the lectin domain in C-terminal part, although the catalytic domain in N-terminal part maintains the homology among the pp-GalNAc-T family. This isozyme is extremely unstable and insoluble, and therefore it is probably not a ppGalNAcT. Heterozygote of a deficient mutant mouse exhibits a phenotype of male infertility due to immotile sperm.
GALNTL5 O-glycan Tn-antigen mucin tumor marker

UDP-GalNAc:polypeptide N-acetylgalactosaminyltransferase

GGDB SymbolGALNT20
Alias O16, GALNT15, GALNTL5    details
DesignationUDP-N-acetyl-alpha-D-galactosamine:polypeptide N-acetylgalactosaminyltransferase-like 5
OrganismHomo sapiens
GeneID 168391
HGNC 21725
mRNA NM_145292      
Protein NP_660335.2      
map7q36.1
EC#
CAZy GT27   
OMIM 615133   
This page does not indicate all of the enzymatic reaction, and expression of "GALNT20".