4nfg
K13R mutant of horse cytochrome c and yeast cytochrome c peroxidase complexK13R mutant of horse cytochrome c and yeast cytochrome c peroxidase complex
Structural highlights
Function[CCPR_YEAST] Destroys radicals which are normally produced within the cells and which are toxic to biological systems. [CYC_HORSE] Electron carrier protein. The oxidized form of the cytochrome c heme group can accept an electron from the heme group of the cytochrome c1 subunit of cytochrome reductase. Cytochrome c then transfers this electron to the cytochrome oxidase complex, the final protein carrier in the mitochondrial electron-transport chain. Plays a role in apoptosis. Suppression of the anti-apoptotic members or activation of the pro-apoptotic members of the Bcl-2 family leads to altered mitochondrial membrane permeability resulting in release of cytochrome c into the cytosol. Binding of cytochrome c to Apaf-1 triggers the activation of caspase-9, which then accelerates apoptosis by activating other caspases (By similarity). Publication Abstract from PubMedIt has been demonstrated that the complex of yeast cytochrome c (Cc) and cytochrome c peroxidase (CcP) exists as a delicate equilibrium between a specific, active state and the non-specific, dynamic encounter state. The ortholog of yeast Cc, horse Cc, binds CcP but forms a much more dynamic complex, as demonstrated by NMR spectroscopy. A single conservative mutation of lysine 13 to arginine reduces the dynamics and enhances the specificity. The crystal structure of the stereospecific complex resembles the yeast Cc-CcP complex. In contrast, the K13A mutation increases the dynamic nature of the complex with CcP, showing that specificity in a redox protein complex can depend on the interactions of a single side chain in the binding interface. This article is protected by copyright. All rights reserved. STRUCTURED DIGITAL ABSTRACT: hCc and yCcP bind by nuclear magnetic resonance (1, 2, 3) hCc and yCcP bind by x-ray crystallography (View interaction). Engineering specificity in a dynamic protein complex with a single conserved mutation.,Bashir Q, Meulenbroek EM, Pannu NS, Ubbink M FEBS J. 2014 Sep 2. doi: 10.1111/febs.13028. PMID:25180929[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
|
| ||||||||||||||||||||