6CIP

Pyruvate:ferredoxin oxidoreductase from Moorella thermoacetica with acetyl-TPP bound

6CIP の概要

• エントリーDOI: 10.2210/pdb6cip/pdb
• 関連するPDBエントリー: 6CIN 6CIO 6CIQ
• 分子名称: PYRUVATE-FERREDOXIN OXIDOREDUCTASE, IRON/SULFUR CLUSTER, 2-ACETYL-THIAMINE DIPHOSPHATE, ... (6 entities in total)
• 機能のキーワード: pyruvate:ferredoxin oxidoreductase, thiamine pyrophosphate, coenzyme a, gated electron transfer, oxidoreductase
• 由来する生物種: Moorella thermoacetica (strain ATCC 39073 / JCM 9320)
• タンパク質・核酸の鎖数: 6
• 化学式量合計: 774490.65

構造登録者

Chen, P.Y.-T.,Drennan, C.L. (登録日: 2018-02-24, 公開日: 2018-03-28, 最終更新日: 2023-10-04)

主引用文献

Chen, P.Y.,Aman, H.,Can, M.,Ragsdale, S.W.,Drennan, C.L.
Binding site for coenzyme A revealed in the structure of pyruvate:ferredoxin oxidoreductase fromMoorella thermoacetica.
Proc. Natl. Acad. Sci. U.S.A., 115:3846-3851, 2018

PubMed Abstract: Pyruvate:ferredoxin oxidoreductase (PFOR) is a microbial enzyme that uses thiamine pyrophosphate (TPP), three [4Fe-4S] clusters, and coenzyme A (CoA) in the reversible oxidation of pyruvate to generate acetyl-CoA and carbon dioxide. The two electrons that are generated as a result of pyruvate decarboxylation are used in the reduction of low potential ferredoxins, which provide reducing equivalents for central metabolism, including the Wood-Ljungdahl pathway. PFOR is a member of the 2-oxoacid:ferredoxin oxidoreductase (OFOR) superfamily, which plays major roles in both microbial redox reactions and carbon dioxide fixation. Here, we present a set of crystallographic snapshots of the best-studied member of this superfamily, the PFOR from (PFOR). These snapshots include the native structure, those of lactyl-TPP and acetyl-TPP reaction intermediates, and the first of an OFOR with CoA bound. These structural data reveal the binding site of CoA as domain III, the function of which in OFORs was previously unknown, and establish sequence motifs for CoA binding in the OFOR superfamily. PFOR structures further show that domain III undergoes a conformational change upon CoA binding that seals off the active site and positions the thiolate of CoA directly adjacent to the TPP cofactor. These structural findings provide a molecular basis for the experimental observation that CoA binding accelerates catalysis by 10-fold.

PubMed: 29581263
DOI: 10.1073/pnas.1722329115

実験手法

X-RAY DIFFRACTION (3.189 Å)