Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Work: 0.187 
  • R-Value Observed: 0.187 

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The structure of chloroplast cytochrome c6 at 1.9 A resolution: evidence for functional oligomerization.

Kerfeld, C.A.Anwar, H.P.Interrante, R.Merchant, S.Yeates, T.O.

(1995) J Mol Biol 250: 627-647

  • DOI: https://doi.org/10.1006/jmbi.1995.0404
  • Primary Citation of Related Structures:  
    1CYI, 1CYJ

  • PubMed Abstract: 

    The molecular structure of cytochrome c6 from the green alga Chlamydomonas reinhardtii has been determined from two crystal forms and refined to 1.9 A resolution. The two crystal forms are likely the result of different levels of post-translational modification of the protein. This is the first report of a high-resolution structure of a chloroplast-derived class I c-type cytochrome. The overall fold is similar to that of other class I c-type cytochromes, consisting of a series of alpha-helices and turns that envelop the heme prosthetic group. There is also a short two-stranded anti-parallel beta-sheet in the vicinity of the methionine axial ligand to the heme; this region of the molecule is formed by the most highly conserved residues in c6-type cytochromes. Although class I c-type cytochromes are assumed to function as monomers, both crystal forms of cytochrome c6 exhibit oligomerization about the heme crevice that is, in part, mediated by the short anti-parallel beta-sheet. The functional significance of this oligomerization is supported by the appearance of similar interfaces in other electron transfer couples, HPLC and light-scattering data, and is furthermore consistent with kinetic data on electron transfer reactions of c6-type cytochromes.

  • Organizational Affiliation

    Molecular Biology Institute, University of California, Los Angeles 90024-1570, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CYTOCHROME C690Chlamydomonas reinhardtiiMutation(s): 0 
Find proteins for P08197 (Chlamydomonas reinhardtii)
Explore P08197 
Go to UniProtKB:  P08197
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP08197
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Work: 0.187 
  • R-Value Observed: 0.187 
  • Space Group: I 2 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.6α = 90
b = 81.6β = 90
c = 81.6γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
R-AXISdata reduction
MSCdata reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1996-01-29
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2011-11-16
    Changes: Atomic model
  • Version 2.0: 2021-03-10
    Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Other, Structure summary