4ZIL

Crystal structure of Rv2466c and oxidoreductase from Mycobacterium tuberculosis in its reduced state

4ZIL の概要

• エントリーDOI: 10.2210/pdb4zil/pdb
• 関連するPDBエントリー: 4NXI
• 分子名称: DSBA oxidoreductase, MAGNESIUM ION (3 entities in total)
• 機能のキーワード: oxidoreductase
• 由来する生物種: Mycobacterium tuberculosis (H37Rv)
• 細胞内の位置: Cytoplasm : O53193
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 49203.78

構造登録者

Albesa-Jove, D.,Urresti, S.,Comino, N.,Tersa, M.,Guerin, M.E. (登録日: 2015-04-28, 公開日: 2015-11-18, 最終更新日: 2024-01-10)

主引用文献

Albesa-Jove, D.,Comino, N.,Tersa, M.,Mohorko, E.,Urresti, S.,Dainese, E.,Chiarelli, L.R.,Pasca, M.R.,Manganelli, R.,Makarov, V.,Riccardi, G.,Svergun, D.I.,Glockshuber, R.,Guerin, M.E.
The Redox State Regulates the Conformation of Rv2466c to Activate the Antitubercular Prodrug TP053.
J.Biol.Chem., 290:31077-31089, 2015

PubMed Abstract: Rv2466c is a key oxidoreductase that mediates the reductive activation of TP053, a thienopyrimidine derivative that kills replicating and non-replicating Mycobacterium tuberculosis, but whose mode of action remains enigmatic. Rv2466c is a homodimer in which each subunit displays a modular architecture comprising a canonical thioredoxin-fold with a Cys(19)-Pro(20)-Trp(21)-Cys(22) motif, and an insertion consisting of a four α-helical bundle and a short α-helical hairpin. Strong evidence is provided for dramatic conformational changes during the Rv2466c redox cycle, which are essential for TP053 activity. Strikingly, a new crystal structure of the reduced form of Rv2466c revealed the binding of a C-terminal extension in α-helical conformation to a pocket next to the active site cysteine pair at the interface between the thioredoxin domain and the helical insertion domain. The ab initio low-resolution envelopes obtained from small angle x-ray scattering showed that the fully reduced form of Rv2466c adopts a "closed" compact conformation in solution, similar to that observed in the crystal structure. In contrast, the oxidized form of Rv2466c displays an "open" conformation, where tertiary structural changes in the α-helical subdomain suffice to account for the observed conformational transitions. Altogether our structural, biochemical, and biophysical data strongly support a model in which the formation of the catalytic disulfide bond upon TP053 reduction triggers local structural changes that open the substrate binding site of Rv2466c allowing the release of the activated, reduced form of TP053. Our studies suggest that similar structural changes might have a functional role in other members of the thioredoxin-fold superfamily.

PubMed: 26546681
DOI: 10.1074/jbc.M115.677039

実験手法

X-RAY DIFFRACTION (1.507 Å)