2jti

From Proteopedia

Solution structure of the yeast iso-1-cytochrome c (T12A) : yeast cytochrome c peroxidase complex

Structural highlights

2jti is a 2 chain structure with sequence from Saccharomyces cerevisiae. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	Solution NMR, 10 models
Ligands:	,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

CCPR_YEAST Destroys radicals which are normally produced within the cells and which are toxic to biological systems.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Recent experimental studies have confirmed a long-held view that protein complex formation proceeds via a short-lived encounter state. The population of this transient intermediate, stabilized mainly by long-range electrostatic interactions, varies among different complexes. Here we show that the occupancy of the encounter state can be modulated across a broad range by single point mutations of interfacial residues. Using a combination of Monte Carlo simulations and paramagnetic relaxation enhancement NMR spectroscopy, we illustrate that it is possible to both enhance and diminish the binding specificity in an electron transfer complex of yeast cytochrome c (Cc) and cytochrome c peroxidase. The Cc T12A mutation decreases the population of the encounter to 10% as compared with 30% in the wild-type complex. More dramatically, the Cc R13A substitution reverses the relative occupancies of the stereospecific and the encounter forms, with the latter now being the dominant species with the population of 80%. This finding indicates that the encounter state can make a large contribution to the stability of a protein complex. Also, it appears that by adjusting the amount of the encounter through a judicious choice of point mutations, we can remodel the energy landscape of a protein complex and tune its binding specificity.

Shifting the equilibrium between the encounter state and the specific form of a protein complex by interfacial point mutations.,Volkov AN, Bashir Q, Worrall JA, Ullmann GM, Ubbink M J Am Chem Soc. 2010 Aug 25;132(33):11487-95. PMID:20672804^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Volkov AN, Bashir Q, Worrall JA, Ullmann GM, Ubbink M. Shifting the equilibrium between the encounter state and the specific form of a protein complex by interfacial point mutations. J Am Chem Soc. 2010 Aug 25;132(33):11487-95. PMID:20672804 doi:10.1021/ja100867c