X-Ray Crystallographic Study of Cyanide Binding Provides Insights Into the Structure-Function Relationship for Cytochrome Cd1 Nitrite Reductase from Paracoccus Pantotrophus.Jafferji, A., Allen, J.W., Ferguson, S.J., Fulop, V.
(2000) J.Biol.Chem. 275: 25089
- PubMed: 10827177
- DOI: 10.1074/jbc.M001377200
- PubMed Abstract:
- The Anatomy of a Bifunctional Enzyme: Structural Basis for Reduction of Oxygen to Water and Synthesys of Nitric Oxide by Cytochrome Cd1
Fulop, V.,Moir, J.W.B.,Ferguson, S.J.,Hajdu, J.
(1995) Cell 81: 369
- Cytochrome Cd1 Structure: Unusual Haem Environments in a Nitrite Reductase and Analysis of Factors Contributing to Beta-Propeller Folds
Baker, S.C.,Saunders, N.F.W.,Willis, A.C.,Ferguson, S.J.,Hajdu, J.,Fulop, V.
(1997) J.Mol.Biol. 269: 440
- Haem Ligand-Switching During Catalysis in Crystals of a Nitrogen Cycle Enzyme
Williams, P.A.,Fulop, V.,Garman, E.F.,Saunders, N.F.W.,Ferguson, S.J.,Hajdu, J.
(1997) Nature 389: 406
We present a 1.59-A resolution crystal structure of reduced Paracoccus pantotrophus cytochrome cd(1) with cyanide bound to the d(1) heme and His/Met coordination of the c heme. Fe-C-N bond angles are 146 degrees for the A subunit and 164 degrees for ...
We present a 1.59-A resolution crystal structure of reduced Paracoccus pantotrophus cytochrome cd(1) with cyanide bound to the d(1) heme and His/Met coordination of the c heme. Fe-C-N bond angles are 146 degrees for the A subunit and 164 degrees for the B subunit of the dimer. The nitrogen atom of bound cyanide is within hydrogen bonding distance of His(345) and His(388) and either a water molecule in subunit A or Tyr(25) in subunit B. The ferrous heme-cyanide complex is unusually stable (K(d) approximately 10(-6) m); we propose that this reflects both the design of the specialized d(1) heme ring and a general feature of anion reductases with active site heme. Oxidation of crystals of reduced, cyanide-bound, cytochrome cd(1) results in loss of cyanide and return to the native structure with Tyr(25) as a ligand to the d(1) heme iron and switching to His/His coordination at the c-type heme. No reason for unusually weak binding of cyanide to the ferric state can be identified; rather it is argued that the protein is designed such that a chelate-based effect drives displacement by tyrosine of cyanide or a weaker ligand, like reaction product nitric oxide, from the ferric d(1) heme.
Laboratory of Molecular Biophysics, Department of Biochemistry, University of Oxford, United Kingdom.