Cytochrome c' from Alcaligenes xylosoxidans - reduced structure with NO bound to proximal side of heme

Experimental Data Snapshot

  • Resolution: 1.35 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.194 

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Unprecedented Proximal Binding of Nitric Oxide to Heme: Implications for Guanylate Cyclase.

Lawson, D.M.Stevenson, C.E.M.Andrew, C.R.Eady, R.R.

(2000) EMBO J 19: 5661

  • DOI: https://doi.org/10.1093/emboj/19.21.5661
  • Primary Citation of Related Structures:  
    1E83, 1E84, 1E85, 1E86

  • PubMed Abstract: 

    Microbial cytochromes c' contain a 5-coordinate His-ligated heme that forms stable adducts with nitric oxide (NO) and carbon monoxide (CO), but not with dioxygen. We report the 1.95 and 1.35 A resolution crystal structures of the CO- and NO-bound forms of the reduced protein from Alcaligenes xylosoxidans. NO disrupts the His-Fe bond and binds in a novel mode to the proximal face of the heme, giving a 5-coordinate species. In contrast, CO binds 6-coordinate on the distal side. A second CO molecule, not bound to the heme, is located in the proximal pocket. Since the unusual spectroscopic properties of cytochromes c' are shared by soluble guanylate cyclase (sGC), our findings have potential implications for the activation of sGC induced by the binding of NO or CO to the heme domain.

  • Organizational Affiliation

    Department of Biological Chemistry, John Innes Centre, Norwich, NR4 7UH, UK. david.lawson@bbsrc.ac.uk

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CYTOCHROME C'127Achromobacter xylosoxidansMutation(s): 0 
Find proteins for P00138 (Alcaligenes xylosoxydans xylosoxydans)
Explore P00138 
Go to UniProtKB:  P00138
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00138
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on PCA
Experimental Data & Validation

Experimental Data

  • Resolution: 1.35 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.194 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.035α = 90
b = 53.035β = 90
c = 180.993γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-11-06
    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: 2019-05-08
    Changes: Data collection, Derived calculations, Experimental preparation, Other
  • Version 2.0: 2020-03-11
    Changes: Other, Polymer sequence
  • Version 2.1: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Refinement description