期刊
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
卷 510, 期 2, 页码 266-271出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2019.01.084
关键词
Glycosyltransferase; Crystal structure; O-glycan; Substrate recognition
资金
- National Key Research and Development Program of China [2016YFA0500302]
- National Natural Science Foundation of China [81430056, 31420103905, 31800626, 81621063]
- Beijing Natural Science Foundation [7161007]
- Lam Chung Nin Foundation for Systems Biomedicine
The UDP-GalNAc:polypeptide N-acetylgalactosaminyltransferases (GalNAc-Ts) catalyze mucin-type O-glycosylation by transferring alpha-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 alpha 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. (C) 2019 Elsevier Inc. All rights reserved.
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