2pu9
From Proteopedia
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| - | [[Image:2pu9.jpg|left|200px]] | + | [[Image:2pu9.jpg|left|200px]] |
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| - | '''Crystal srtucture of the binary complex between ferredoxin: thioredoxin reductase and thioredoxin f''' | + | {{Structure |
| + | |PDB= 2pu9 |SIZE=350|CAPTION= <scene name='initialview01'>2pu9</scene>, resolution 1.650Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene> and <scene name='pdbligand=SF4:IRON/SULFUR CLUSTER'>SF4</scene> | ||
| + | |ACTIVITY= | ||
| + | |GENE= ftrC ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1143 Synechocystis sp.]), ftrV ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1143 Synechocystis sp.]) | ||
| + | }} | ||
| + | |||
| + | '''Crystal srtucture of the binary complex between ferredoxin: thioredoxin reductase and thioredoxin f''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 2PU9 is a [ | + | 2PU9 is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Spinacia_oleracea Spinacia oleracea] and [http://en.wikipedia.org/wiki/Synechocystis_sp. Synechocystis sp.]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2PU9 OCA]. |
==Reference== | ==Reference== | ||
| - | Structural snapshots along the reaction pathway of ferredoxin-thioredoxin reductase., Dai S, Friemann R, Glauser DA, Bourquin F, Manieri W, Schurmann P, Eklund H, Nature. 2007 Jul 5;448(7149):92-6. PMID:[http:// | + | Structural snapshots along the reaction pathway of ferredoxin-thioredoxin reductase., Dai S, Friemann R, Glauser DA, Bourquin F, Manieri W, Schurmann P, Eklund H, Nature. 2007 Jul 5;448(7149):92-6. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17611542 17611542] |
[[Category: Protein complex]] | [[Category: Protein complex]] | ||
[[Category: Spinacia oleracea]] | [[Category: Spinacia oleracea]] | ||
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[[Category: thioredoxin]] | [[Category: thioredoxin]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 18:17:26 2008'' |
Revision as of 16:17, 20 March 2008
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| , resolution 1.650Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | and | ||||||
| Gene: | ftrC (Synechocystis sp.), ftrV (Synechocystis sp.) | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Crystal srtucture of the binary complex between ferredoxin: thioredoxin reductase and thioredoxin f
Overview
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).
About this Structure
2PU9 is a Protein complex structure of sequences from Spinacia oleracea and Synechocystis sp.. Full crystallographic information is available from OCA.
Reference
Structural snapshots along the reaction pathway of ferredoxin-thioredoxin reductase., Dai S, Friemann R, Glauser DA, Bourquin F, Manieri W, Schurmann P, Eklund H, Nature. 2007 Jul 5;448(7149):92-6. PMID:17611542
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