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Force-clamp spectroscopy detects residue co-evolution in enzyme catalysis.

AuthorsPérez-Jímenez, Raul; Kosuri, Pallav; Rodríguez-Larrea, David; Gavira Gallardo, J. A. ; Fernández Soler, Julio M.; Sánchez-Ruiz, José M.; Wiita, Arun P.
Issue Date3-Oct-2008
PublisherAmerican Society for Biochemistry and Molecular Biology
CitationJournal of Biological Chemistry 283(40): 27121-27129 (2008)
AbstractUnderstanding how the catalytic mechanisms of enzymes are optimized through evolution remains a major challenge in molecular biology. The concept of co-evolution implicates that compensatory mutations occur to preserve the structure and function of proteins. We have combined statistical analysis of protein sequences with the sensitivity of single molecule force-clamp spectroscopy to probe how catalysis is affected by structurally distant correlated mutations in Escherichia coli thioredoxin. Our findings show that evolutionary anti-correlated mutations have an inhibitory effect on enzyme catalysis, whereas positively correlated mutations rescue the catalytic activity. We interpret these results in terms of an evolutionary tuning of both the enzyme-substrate binding process and the chemistry of the active site. Our results constitute a direct observation of distant residue co-evolution in enzyme catalysis.
Description22 pages, 6 figures, 1 table.
Publisher version (URL)http://dx.doi.org/10.1074/jbc.M803746200
Appears in Collections:(IACT) Artículos
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