2.2 A structure of oxy-peroxidase as a model for the transient enzyme: peroxide complex.Miller, M.A., Shaw, A., Kraut, J.
(1994) Nat.Struct.Mol.Biol. 1: 524-531
- PubMed: 7664080
- PubMed Abstract:
- Reaction of Ferrous Cytochrome C Peroxidase with Dioxygen: Site-Directed Mutagenesis Provides Evidence for Rapid Reduction of Dioxygen by Intramolecular Electron Transfer from the Compound I Radical Site
Miller, M.A.,Bandyopadhyay, D.,Mauro, J.M.,Taylor, T.G.,Kraut, J.
(1992) Biochemistry 31: 2789
- Crystal Structure of Yeast Cytochrome C Peroxidase Refined at 1.7 Angstroms Resolution
Finzel, B.C.,Poulos, T.L.,Kraut, J.
(1984) J.Biol.Chem. 259: 13027
- X-Ray Structures of Recombinant Yeast Cytochrome C Peroxidase and Three Heme Cleft Mutants Prepared by Site-Directed Mutagenesis
Wang, J.,Mauro, J.M.,Edwards, S.L.,Oatley, S.J.,Fishel, L.A.,Ashford, V.A.,Xuong, N.-H.,Kraut, J.
(1990) Biochemistry 29: 7160
The Fe+3-OOH complex of peroxidases has a very short half life, and its structure cannot be determined by conventional methods. The Fe+2-O2 complex provides a useful structural model for this intermediate, as it differs by only one electron and one p ...
The Fe+3-OOH complex of peroxidases has a very short half life, and its structure cannot be determined by conventional methods. The Fe+2-O2 complex provides a useful structural model for this intermediate, as it differs by only one electron and one proton from the transient Fe+3-OOH complex. We therefore determined the crystal structure of the Fe+2-O2 complex formed by a yeast cytochrome c peroxidase mutant with Trp 191 replaced by Phe. The refined structure shows that dioxygen can form a hydrogen bond with the conserved distal His residue, but not with the conserved distal Arg residue. When the transient Fe+3-OOH complex is modelled in a similar orientation, the active site of peroxidase appears to be optimized for catalysing proton transfer between the vicinal oxygen atoms of the peroxy-anion.
Department of Chemistry, University of California, San Diego La Jolla 92093-0317.