1S4P

Crystal structure of yeast alpha1,2-mannosyltransferase Kre2p/Mnt1p: ternary complex with GDP/Mn and methyl-alpha-mannoside acceptor

1S4P の概要

• エントリーDOI: 10.2210/pdb1s4p/pdb
• 分子名称: Glycolipid 2-alpha-mannosyltransferase, alpha-D-mannopyranose-(1-2)-alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, ... (9 entities in total)
• 機能のキーワード: alpha/beta fold, nucleotide-binding domain, rossmann fold, ternary complex with gdp-mn2+ and methyl-alpha-mannoside acceptor, transferase
• 由来する生物種: Saccharomyces cerevisiae (baker's yeast)
• 細胞内の位置: Golgi apparatus membrane; Single-pass type II membrane protein: P27809
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 86523.11

構造登録者

Lobsanov, Y.D.,Romero, P.A.,Sleno, B.,Yu, B.,Yip, P.,Herscovics, A.,Howell, P.L. (登録日: 2004-01-16, 公開日: 2004-05-04, 最終更新日: 2024-10-16)

主引用文献

Lobsanov, Y.D.,Romero, P.A.,Sleno, B.,Yu, B.,Yip, P.,Herscovics, A.,Howell, P.L.
Structure of Kre2p/Mnt1p: A YEAST {alpha}1,2-MANNOSYLTRANSFERASE INVOLVED IN MANNOPROTEIN BIOSYNTHESIS
J.Biol.Chem., 279:17921-17931, 2004

PubMed Abstract: Kre2p/Mnt1p is a Golgi alpha1,2-mannosyltransferase involved in the biosynthesis of Saccharomyces cerevisiae cell wall glycoproteins. The protein belongs to glycosyltransferase family 15, a member of which has been implicated in virulence of Candida albicans. We present the 2.0 A crystal structures of the catalytic domain of Kre2p/Mnt1p and its binary and ternary complexes with GDP/Mn(2+) and GDP/Mn(2+)/acceptor methyl-alpha-mannoside. The protein has a mixed alpha/beta fold similar to the glycosyltransferase-A (GT-A) fold. Although the GDP-mannose donor was used in the crystallization experiments and the GDP moiety is bound tightly to the active site, the mannose is not visible in the electron density. The manganese is coordinated by a modified DXD motif (EPD), with only the first glutamate involved in a direct interaction. The position of the donor mannose was modeled using the binary and ternary complexes of other GT-A enzymes. The C1" of the modeled donor mannose is within hydrogen-bonding distance of both the hydroxyl of Tyr(220) and the O2 of the acceptor mannose. The O2 of the acceptor mannose is also within hydrogen bond distance of the hydroxyl of Tyr(220). The structures, modeling, site-directed mutagenesis, and kinetic analysis suggest two possible catalytic mechanisms. Either a double-displacement mechanism with the hydroxyl of Tyr(220) as the potential nucleophile or alternatively, an S(N)i-like mechanism with Tyr(220) positioning the substrates for catalysis. The importance of Tyr(220) in both mechanisms is highlighted by a 3000-fold reduction in k(cat) in the Y220F mutant.

PubMed: 14752117
DOI: 10.1074/jbc.M312720200

実験手法

X-RAY DIFFRACTION (2.01 Å)