5A07

X-ray structure of the mannosyltransferase Ktr4p from S. cerevisiae in complex with GDP

5A07 の概要

• エントリーDOI: 10.2210/pdb5a07/pdb
• 関連するPDBエントリー: 5A08
• 分子名称: PROBABLE MANNOSYLTRANSFERASE KTR4, GUANOSINE-5'-DIPHOSPHATE, MANGANESE (II) ION, ... (5 entities in total)
• 機能のキーワード: transferase, golgi apparatus, mannosyltransferases, gt-a, membrane proteins
• 由来する生物種: SACCHAROMYCES CEREVISIAE (BAKER'S YEAST)
• 細胞内の位置: Membrane ; Single-pass type II membrane protein : P38131
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 103567.22

構造登録者

Possner, D.D.D.,Guy, J.E. (登録日: 2015-04-17, 公開日: 2015-08-26, 最終更新日: 2024-11-13)

主引用文献

Possner, D.D.D.,Claesson, M.,Guy, J.E.
Structure of the Glycosyltransferase Ktr4P from Saccharomyces Cerevisiae
Plos One, 10:36239-, 2015

PubMed Abstract: In the yeast Saccharomyces cerevisiae, members of the Kre2/Mnt1 protein family have been shown to be α-1,2-mannosyltransferases or α-1,2-mannosylphosphate transferases, utilising an Mn2+-coordinated GDP-mannose as the sugar donor and a variety of mannose derivatives as acceptors. Enzymes in this family are localised to the Golgi apparatus, and have been shown to be involved in both N- and O-linked glycosylation of newly-synthesised proteins, including cell wall glycoproteins. Our knowledge of the nine proteins in this family is however very incomplete at present. Only one family member, Kre2p/Mnt1p, has been studied by structural methods, and three (Ktr4p, Ktr5p, Ktr7p) are completely uncharacterised and remain classified only as putative glycosyltransferases. Here we use in vitro enzyme activity assays to provide experimental confirmation of the predicted glycosyltransferase activity of Ktr4p. Using GDP-mannose as the donor, we observe activity towards the acceptor methyl-α-mannoside, but little or no activity towards mannose or α-1,2-mannobiose. We also present the structure of the lumenal catalytic domain of S. cerevisiae Ktr4p, determined by X-ray crystallography to a resolution of 2.2 Å, and the complex of the enzyme with GDP to 1.9 Å resolution.

PubMed: 26296208
DOI: 10.1371/JOURNAL.PONE.013623

実験手法

X-RAY DIFFRACTION (1.9 Å)