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Guo, J.M. et al.

Molecular cloning and characterization of a novel member of the UDP-GalNAc:polypeptide N-acetylgalactosaminyltransferase family, pp-GalNAc-T12.

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.[1]

References

Molecular cloning and characterization of a novel member of the UDP-GalNAc:polypeptide N-acetylgalactosaminyltransferase family, pp-GalNAc-T12. Guo, J.M., Zhang, Y., Cheng, L., Iwasaki, H., Wang, H., Kubota, T., Tachibana, K., Narimatsu, H. FEBS Lett. (2002) [Pubmed]

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