6IWR

Crystal structure of GalNAc-T7 with UDP, GalNAc and Mn2+

Summary for 6IWR

• Entry DOI: 10.2210/pdb6iwr/pdb
• Descriptor: N-acetylgalactosaminyltransferase 7, MANGANESE (II) ION, 2-acetamido-2-deoxy-beta-D-glucopyranose, ... (6 entities in total)
• Functional Keywords: polypeptide n acetylgalactosaminyltransferase activity, transferring glycosyl groups, manganese ion binding, carbohydrate binding, metal ion binding, transferase
• Biological source: Homo sapiens (Human)
• Total number of polymer chains: 6
• Total formula weight: 414747.62

Authors

Yu, C.,Yin, Y.X. (deposition date: 2018-12-06, release date: 2019-02-06, Last modification date: 2024-11-20)

Primary citation

Yu, C.,Liang, L.,Yin, Y.
Structural basis of carbohydrate transfer activity of UDP-GalNAc: Polypeptide N-acetylgalactosaminyltransferase 7.
Biochem. Biophys. Res. Commun., 510:266-271, 2019

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.

PubMed: 30685086
DOI: 10.1016/j.bbrc.2019.01.084

Experimental method

X-RAY DIFFRACTION (2.604 Å)