2V2B

L-RHAMNULOSE-1-PHOSPHATE ALDOLASE FROM ESCHERICHIA COLI (MUTANT E117S- E192A-K248G-R253A-E254A)

2V2B の概要

• エントリーDOI: 10.2210/pdb2v2b/pdb
• 関連するPDBエントリー: 1GT7 1OJR 2UYU 2UYV 2V29 2V2A 2V9E 2V9F 2V9G 2V9I 2V9L 2V9M 2V9N 2V9O
• 分子名称: RHAMNULOSE-1-PHOSPHATE ALDOLASE, ZINC ION, ACETATE ION, ... (6 entities in total)
• 機能のキーワード: zinc enzyme, metal-binding, surface mutation, 2-ketose degradation, protein-protein interface, lyase, aldolase, class ii, rare sugar, cleavage of l-rhamnulose-1-phosphate to dihydroxyacetone phosphate, bacterial l-rhamnose metabolism, rhamnose metabolism, protein engineering, domain motion for mechanical support of catalysis
• 由来する生物種: ESCHERICHIA COLI
• 細胞内の位置: Cytoplasm: P32169
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 30218.98

構造登録者

Grueninger, D.,Schulz, G.E. (登録日: 2007-06-04, 公開日: 2008-01-08, 最終更新日: 2023-12-13)

主引用文献

Grueninger, D.,Schulz, G.E.
Antenna Domain Mobility and Enzymatic Reaction of L-Rhamnulose-1-Phosphate Aldolase.
Biochemistry, 47:607-, 2008

PubMed Abstract: The enzyme l-rhamnulose-1-phosphate aldolase from Escherichia coli participates in the degradation pathway of l-rhamnose, a ubiquitous deoxy-hexose. It is a homotetramer of the rare C4-symmetric type with N-terminal domains protruding like antennas from the main body. A mobility analysis of the enzyme gave rise to the hypothesis that an anisotropic thermal antenna motion may support the catalysis (Kroemer et al., Biochemistry 42, 10560, 2003). We checked this hypothesis by generating four single mutants and one disulfide bridge that were designed to reduce the mobility of the antenna domain without disturbing the chain-fold or the active center. The catalytic rates of the mutants revealed activity reductions that correlated well with the expected antenna fixation. Among these mutants, K15W was crystallized, structurally elucidated, and used as a guide for modeling the others. The structure confirmed the design because the mutation introduced a tight nonpolar contact to a neighboring subunit that fixed the antenna but did not affect the main chain. The fixation was confirmed by a comparison of the anisotropic B-factors describing the mobility of the domains. It turned out that the distinctly anisotropic mobility of the wild-type antenna domain has become isotropic in K15W, in agreement with the design. We suggest that, like K15W, the other mutations also followed the design, validating the correlation between antenna mobility and activity. This correlation suggests that the domain mobility facilitates the reaction.

PubMed: 18085797
DOI: 10.1021/BI7012799

実験手法

X-RAY DIFFRACTION (1.5 Å)