Download MendeleyStructural basis of carbohydrate transfer activity of UDP-GalNAc: Polypeptide N-acetylgalactosaminyltransferase 7.
Yu, C., Liang, L., Yin, Y.(2019) Biochem Biophys Res Commun 510: 266-271
- PubMed: 30685086
- DOI: https://doi.org/10.1016/j.bbrc.2019.01.084
- Primary Citation of Related Structures:
6IWQ, 6IWR - PubMed Abstract:
The UDP-GalNAc:polypeptide N-acetylgalactosaminyltransferases (GalNAc-Ts) catalyze mucin-type O-glycosylation by transferring α-N-acetylgalactosamine (GalNAc) from UDP- GalNAc to Ser or Thr residues of target proteins. We resolved the crystal structures of GalNAc-T7, a GalNAc-T capable of glycosylating consecutive sites, and of its complex with the donor substrate UDP-GalNAc. The N-terminal catalytic domain and C-terminal lectin domain are connected by a flexible linker, forming a narrow cleft for the acceptor substrate. Only the α subdomain of the lectin domain binds to the glycosyl group, indicating that key residues determine substrate binding. Compared to the Apo structure, the loop covering the catalytic center of the complex show significant conformational changes, indicating the mechanism of the catalytic reaction.
Organizational Affiliation:
Institute of Systems Biomedicine, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, 100191, China; Department of Pathology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, 100191, China.
