2PVO

Crystal srtucture of the ternary complex between thioredoxin f, ferredoxin, and ferredoxin: thioredoxin reductase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.202 

wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

Structural snapshots along the reaction pathway of ferredoxin-thioredoxin reductase.

Dai, S.Friemann, R.Glauser, D.A.Bourquin, F.Manieri, W.Schurmann, P.Eklund, H.

(2007) Nature 448: 92-96

  • DOI: https://doi.org/10.1038/nature05937
  • Primary Citation of Related Structures:  
    2PU9, 2PUK, 2PUO, 2PVD, 2PVG, 2PVO

  • 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).


  • Organizational Affiliation

    Howard Hughes Medical Institute, Integrated Department of Immunology, National Jewish Medical and Research Center & University of Colorado Health Sciences Center, 1400 Jackson Street, Denver, Colorado 80206, USA. dais@njc.org


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ferredoxin-thioredoxin reductase, catalytic chain110Synechocystis sp.Mutation(s): 0 
Gene Names: ftrC
EC: 1.8.7.2
UniProt
Find proteins for Q55389 (Synechocystis sp. (strain ATCC 27184 / PCC 6803 / Kazusa))
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Go to UniProtKB:  Q55389
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UniProt GroupQ55389
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Ferredoxin-thioredoxin reductase, variable chain74Synechocystis sp.Mutation(s): 0 
Gene Names: ftrV
UniProt
Find proteins for Q55781 (Synechocystis sp. (strain ATCC 27184 / PCC 6803 / Kazusa))
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UniProt GroupQ55781
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Thioredoxin F-type, chloroplast111Spinacia oleraceaMutation(s): 1 
UniProt
Find proteins for P09856 (Spinacia oleracea)
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UniProt GroupP09856
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Ferredoxin-196Synechocystis sp.Mutation(s): 0 
Gene Names: petFfed
UniProt
Find proteins for P27320 (Synechocystis sp. (strain ATCC 27184 / PCC 6803 / Kazusa))
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Go to UniProtKB:  P27320
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UniProt GroupP27320
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.202 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 130.426α = 90
b = 130.426β = 90
c = 63.837γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
PDB_EXTRACTdata extraction
ADSCdata collection
HKL-2000data reduction
AMoREphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Released Date: 2007-07-10 
  • Deposition Author(s): Dai, S.

Revision History  (Full details and data files)

  • Version 1.0: 2007-07-10
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-18
    Changes: Refinement description
  • Version 1.4: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.5: 2024-10-30
    Changes: Data collection, Structure summary