Structure of the C-553 cytochrome from Bacillus pasteruii to 1.7 A resolution

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.174 

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Crystal structure of oxidized Bacillus pasteurii cytochrome c553 at 0.97-A resolution.

Benini, S.Gonzalez, A.Rypniewski, W.R.Wilson, K.S.Van Beeumen, J.J.Ciurli, S.

(2000) Biochemistry 39: 13115-13126

  • DOI: https://doi.org/10.1021/bi000402j
  • Primary Citation of Related Structures:  
    1B7V, 1C75

  • PubMed Abstract: 

    This article reports the first X-ray structure of the soluble form of a c-type cytochrome isolated from a Gram-positive bacterium. Bacillus pasteurii cytochrome c(553), characterized by a low reduction potential and by a low sequence homology with cytochromes from Gram-negative bacteria or eukaryotes, is a useful case study for understanding the structure-function relationships for this class of electron-transfer proteins. Diffraction data on a single crystal of cytochrome c(553) were obtained using synchrotron radiation at 100 K. The structure was determined at 0.97-A resolution using ab initio phasing and independently at 1.70 A in an MAD experiment. In both experiments, the structure solution exploited the presence of a single Fe atom as anomalous scatterer in the protein. For the 0.97-A data, the phasing was based on a single data set. This is the most precise structure of a heme protein to date. The crystallized cytochrome c(553) contains only 71 of the 92 residues expected from the intact protein sequence, lacking the first 21 amino acids at the N-terminus. This feature is consistent with previous evidence that this tail, responsible for anchoring the protein to the cytoplasm membrane, is easily cleaved off during the purification procedure. The heme prosthetic group in B. pasteurii cytochrome c(553) is surrounded by three alpha-helices in a compact arrangement. The largely exposed c-type heme group features a His-Met axial coordination of the Fe(III) ion. The protein is characterized by a very asymmetric charge distribution, with the exposed heme edge located on a surface patch devoid of net charges. A structural search of a representative set of protein structures reveals that B. pasteurii cytochrome c(553) is most similar to Pseudomonas cytochromes c(551), followed by cytochromes c(6), Desulfovibrio cytochrome c(553), cytochromes c(552) from thermophiles, and cytochromes c from eukaryotes. Notwithstanding a low sequence homology, a structure-based alignment of these cytochromes shows conservation of three helical regions, with different additional secondary structure motifs characterizing each protein. In B. pasteurii cytochrome c(553), these motifs are represented by the shortest interhelix connecting fragments observed for this group of proteins. The possible relationships between heme solvent accessibility and the electrochemical reduction potential are discussed.

  • Organizational Affiliation

    European Molecular Biology Laboratory, c/o DESY, Notkestrasse 85, D-22603 Hamburg, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PROTEIN (CYTOCHROME C-553)71Sporosarcina pasteuriiMutation(s): 0 
Find proteins for P82599 (Sporosarcina pasteurii)
Explore P82599 
Go to UniProtKB:  P82599
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP82599
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on HEC

Download Ideal Coordinates CCD File 
B [auth A]HEME C
C34 H34 Fe N4 O4
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.174 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 37.09α = 90
b = 39.16β = 90
c = 43.99γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
CCP4data scaling
ROTAVATAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-03-27
    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: 2013-01-30
    Changes: Data collection, Database references, Other
  • Version 1.4: 2017-10-04
    Changes: Refinement description
  • Version 2.0: 2021-03-03
    Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary