Molecular cloning and characterization of a novel member of the UDP‐GalNAc:polypeptide N‐acetylgalactosaminyltransferase family, pp‐GalNAc‐T121
Open Access
- 10 July 2002
- journal article
- Published by Wiley in FEBS Letters
- Vol. 524 (1-3), 211-218
- https://doi.org/10.1016/s0014-5793(02)03007-7
Abstract
We cloned in silico a novel human UDP‐GalNAc:polypeptide N‐acetylgalactosaminyltransferase (pp‐GalNAc‐T), pp‐GalNAc‐T12. The deduced amino acid sequence of pp‐GalNAc‐T12 contains all conserved motifs in pp‐GalNAc‐T family proteins. Quantitative real time polymerase chain reaction analysis revealed that the pp‐GalNAc‐T12 transcript was expressed mainly in digestive organs such as stomach, small intestine and colon. The recombinant pp‐GalNAc‐T12 transferred GalNAc to the mucin‐derived peptides such as the Muc1a, Muc5AC, EA2 peptides and the GalNAc‐Muc5AC glycopeptide. Since mucins are glycoproteins mainly produced in the digestive organs, our results suggest that pp‐GalNAc‐T12 plays an important role in the initial step of mucin‐type oligosaccharide biosynthesis in digestive organs.Keywords
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