3U13

Crystal Structure of de Novo design of cystein esterase ECH13 at the resolution 1.6A, Northeast Structural Genomics Consortium Target OR51

3U13 の概要

• エントリーDOI: 10.2210/pdb3u13/pdb
• 関連するPDBエントリー: 1Q92
• 分子名称: artificial protein OR51, PHOSPHATE ION, MAGNESIUM ION, ... (6 entities in total)
• 機能のキーワード: structural genomics, psi-biology, protein structure initiative, northeast structural genomics consortium, nesg, ech13, hydrolase
• 由来する生物種: synthetic construct
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 24537.35

構造登録者

Kuzin, A.,Su, M.,Seetharaman, J.,Sahdev, S.,Xiao, R.,Kohan, E.,Richter, F.,Everett, J.K.,Acton, T.B.,Baker, D.,Montelione, G.T.,Hunt, J.F.,Tong, L.,Northeast Structural Genomics Consortium (NESG) (登録日: 2011-09-29, 公開日: 2011-11-23, 最終更新日: 2024-11-27)

主引用文献

Richter, F.,Blomberg, R.,Khare, S.D.,Kiss, G.,Kuzin, A.P.,Smith, A.J.,Gallaher, J.,Pianowski, Z.,Helgeson, R.C.,Grjasnow, A.,Xiao, R.,Seetharaman, J.,Su, M.,Vorobiev, S.,Lew, S.,Forouhar, F.,Kornhaber, G.J.,Hunt, J.F.,Montelione, G.T.,Tong, L.,Houk, K.N.,Hilvert, D.,Baker, D.
Computational design of catalytic dyads and oxyanion holes for ester hydrolysis.
J.Am.Chem.Soc., 134:16197-16206, 2012

PubMed Abstract: Nucleophilic catalysis is a general strategy for accelerating ester and amide hydrolysis. In natural active sites, nucleophilic elements such as catalytic dyads and triads are usually paired with oxyanion holes for substrate activation, but it is difficult to parse out the independent contributions of these elements or to understand how they emerged in the course of evolution. Here we explore the minimal requirements for esterase activity by computationally designing artificial catalysts using catalytic dyads and oxyanion holes. We found much higher success rates using designed oxyanion holes formed by backbone NH groups rather than by side chains or bridging water molecules and obtained four active designs in different scaffolds by combining this motif with a Cys-His dyad. Following active site optimization, the most active of the variants exhibited a catalytic efficiency (k(cat)/K(M)) of 400 M(-1) s(-1) for the cleavage of a p-nitrophenyl ester. Kinetic experiments indicate that the active site cysteines are rapidly acylated as programmed by design, but the subsequent slow hydrolysis of the acyl-enzyme intermediate limits overall catalytic efficiency. Moreover, the Cys-His dyads are not properly formed in crystal structures of the designed enzymes. These results highlight the challenges that computational design must overcome to achieve high levels of activity.

PubMed: 22871159
DOI: 10.1021/ja3037367

実験手法

X-RAY DIFFRACTION (1.6 Å)