Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.200 

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This is version 1.4 of the entry. See complete history


Amino acid sequence, crystallization and structure determination of reduced and oxidized cytochrome c6 from the green alga Scenedesmus obliquus.

Schnackenberg, J.Than, M.E.Mann, K.Wiegand, G.Huber, R.Reuter, W.

(1999) J Mol Biol 290: 1019-1030

  • DOI: https://doi.org/10.1006/jmbi.1999.2944
  • Primary Citation of Related Structures:  
    1C6O, 1C6R

  • PubMed Abstract: 

    Cytochrome c6from the unicellular green alga Scenedesmus obliquus was sequenced, crystallized in its reduced and oxidized state and the three-dimensional structure of the protein in both redox states was determined by X-ray crystallography. Reduced cytochrome c6crystallized as a monomer in the space group P 21212, whereas the oxidized protein crystallized as a dimer in the space group P 3121. The structures were solved by molecular replacement and refined to 1. 9 and 2.0 A, respectively. Comparison of the structures of both redox states revealed only slight differences on the protein surface, whereas a distortion along the axis between the heme iron and its coordinating Met61 residue was observed. No redox-dependent movement of internal water molecules could be detected. The high degree of similarity of the surfaces and charge distributions of both redox states, as well as the dimerization of cytochrome c6as observed in the oxidized crystal, is discussed with respect to its biological relevance and its implications for the reaction mechanisms between cytochrome c6and its redox partners. The dimer of oxidized cytochrome c6may represent a molecular structure occurring in a binary complex with cytochrome b6f. This assembly might be required for the correct orientation of cytochrome c6with respect to its redox partner cytochrome b6f, facilitating the electron transfer within the complex. If the dimerization is not redox-dependent in vivo, the almost identical surfaces of both redox states do not support a long range differentiation between reduced and oxidized cyt c6, i.e. a random collision model for the formation of an electron transfer complex must be assumed.

  • Organizational Affiliation

    Max-Planck-Institut für Biochemie, Am Klopferspitz 18A, Martinsried, D-82152, Germany. jschnackenberg@nibh.go.jp

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CYTOCHROME C689Tetradesmus obliquusMutation(s): 0 
Gene Names: petJ
Find proteins for P57736 (Tetradesmus obliquus)
Explore P57736 
Go to UniProtKB:  P57736
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP57736
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.200 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 35.56α = 90
b = 48.47β = 90
c = 43.92γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
CCP4data scaling
ROTAVATAdata scaling
TRUNCATEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-04-12
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-04
    Changes: Advisory, Refinement description
  • Version 1.4: 2023-08-09
    Changes: Advisory, Data collection, Database references, Derived calculations, Refinement description