cytochrome cH from Methylobacterium extorquens

Experimental Data Snapshot

  • Resolution: 2.01 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.161 

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This is version 1.6 of the entry. See complete history


The Molecular Structure of an Unusual Cytochrome C2 Determined at 2.0A; the Cytochrome cH from Methylobacterium Extorquens

Read, J.Gill, R.Dales, S.L.Cooper, J.B.Wood, S.P.Anthony, C.

(1999) Protein Sci 8: 1232

  • DOI: https://doi.org/10.1110/ps.8.6.1232
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Cytochrome cH is the electron donor to the oxidase in methylotrophic bacteria. Its amino acid sequence suggests that it is a typical Class 1 cytochrome c, but some features of the sequence indicated that its structure might be of special interest. The structure of oxidized cytochrome cH has been solved to 2.0 A resolution by X-ray diffraction. It has the classical tertiary structure of the Class 1 cytochromes c but bears a closer gross resemblance to mitochondrial cytochrome c than to the bacterial cytochrome c2. The left-hand side of the haem cleft is unique; in particular, it is highly hydrophobic, the usual water is absent, and the "conserved" Tyr67 is replaced by tryptophan. A number of features of the structure demonstrate that the usual hydrogen bonding network involving water in the haem channel is not essential and that other mechanisms may exist for modulation of redox potentials in this cytochrome.

  • Organizational Affiliation

    Division of Biochemistry and Molecular Biology, School of Biological Sciences, University of Southampton, United Kingdom.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C
100Methylorubrum extorquensMutation(s): 0 
Find proteins for Q7SIA4 (Methylorubrum extorquens)
Explore Q7SIA4 
Go to UniProtKB:  Q7SIA4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7SIA4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.01 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.161 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 33.76α = 67.81
b = 57.57β = 89.33
c = 50.95γ = 74.4
Software Package:
Software NamePurpose
MOSFLMdata reduction
Agrovatadata scaling
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-10-13
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-05-30
    Changes: Data collection, Database references
  • Version 1.4: 2019-05-08
    Changes: Data collection, Derived calculations, Experimental preparation
  • Version 1.5: 2019-05-22
    Changes: Data collection, Refinement description
  • Version 1.6: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description