The 1.13-Å structure of iron-free cytochrome c peroxidase
Copyright policy )The 1.13-Å structure of iron-free cytochrome c peroxidase
The iron-free cytochrome c peroxidase (CCP) crystal structure has been determined to 1.13 A and compared with the 1.2-A ferric-CCP structure. Quite unexpectedly, removal of the iron has no effect on porphyrin geometry and distortion, indicating that protein-porphyrin interactions and not iron coordination or formation of the axial His-Fe bond determines porphyrin conformation. However, there are changes in solvent structure in the distal pocket, which lead to changes in the distal His52 acid-base catalyst. The observed ability of His52 to move in response to small changes in solvent structure is very likely important for its role as a catalyst in assisting in the heterolytic fission of the peroxide O-O bond.
- University of California, Irvine United States
- University of California, San Francisco United States
- Touro University California United States
- ASTRAZENECA UK LIMITED United Kingdom
Binding Sites, Porphyrins, Protein Conformation, Iron, Electron Spin Resonance Spectroscopy, Solvents, Cytochrome-c Peroxidase, Crystallography, X-Ray
Binding Sites, Porphyrins, Protein Conformation, Iron, Electron Spin Resonance Spectroscopy, Solvents, Cytochrome-c Peroxidase, Crystallography, X-Ray
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