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2PVG

Crystal srtucture of the binary complex between ferredoxin and ferredoxin:thioredoxin reductase

Summary for 2PVG
Entry DOI10.2210/pdb2pvg/pdb
Related2PU9 2PUK 2PUO 2PVD
DescriptorFerredoxin-thioredoxin reductase, catalytic chain, Ferredoxin-thioredoxin reductase, variable chain, Ferredoxin-1, ... (6 entities in total)
Functional Keywordsthioredoxin, ferredoxin. redox, iron-sulfur, electron transport
Biological sourceSynechocystis sp.
More
Total number of polymer chains3
Total formula weight31156.73
Authors
Dai, S. (deposition date: 2007-05-09, release date: 2007-07-10, Last modification date: 2024-11-06)
Primary citationDai, S.,Friemann, R.,Glauser, D.A.,Bourquin, F.,Manieri, W.,Schurmann, P.,Eklund, H.
Structural snapshots along the reaction pathway of ferredoxin-thioredoxin reductase.
Nature, 448:92-96, 2007
Cited by
PubMed Abstract: Oxygen-evolving photosynthetic organisms regulate carbon metabolism through a light-dependent redox signalling pathway. Electrons are shuttled from photosystem I by means of ferredoxin (Fdx) to ferredoxin-thioredoxin reductase (FTR), which catalyses the two-electron-reduction of chloroplast thioredoxins (Trxs). These modify target enzyme activities by reduction, regulating carbon flow. FTR is unique in its use of a [4Fe-4S] cluster and a proximal disulphide bridge in the conversion of a light signal into a thiol signal. We determined the structures of FTR in both its one- and its two-electron-reduced intermediate states and of four complexes in the pathway, including the ternary Fdx-FTR-Trx complex. Here we show that, in the first complex (Fdx-FTR) of the pathway, the Fdx [2Fe-2S] cluster is positioned suitably for electron transfer to the FTR [4Fe-4S] centre. After the transfer of one electron, an intermediate is formed in which one sulphur atom of the FTR active site is free to attack a disulphide bridge in Trx and the other sulphur atom forms a fifth ligand for an iron atom in the FTR [4Fe-4S] centre--a unique structure in biology. Fdx then delivers a second electron that cleaves the FTR-Trx heterodisulphide bond, which occurs in the Fdx-FTR-Trx complex. In this structure, the redox centres of the three proteins are aligned to maximize the efficiency of electron transfer from the Fdx [2Fe-2S] cluster to the active-site disulphide of Trxs. These results provide a structural framework for understanding the mechanism of disulphide reduction by an iron-sulphur enzyme and describe previously unknown interaction networks for both Fdx and Trx (refs 4-6).
PubMed: 17611542
DOI: 10.1038/nature05937
PDB entries with the same primary citation
Experimental method
X-RAY DIFFRACTION (2.4 Å)
Structure validation

229380

數據於2024-12-25公開中

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