Quantitative Dissection of Hydrogen Bond-Mediated Proton Transfer in the Ketosteroid Isomerase Active Site

Sigala, P. A.; Fafarman, A. T.; Schwans, J.P.; Fried, S. D.; Fenn, T. D.; Caaveiro, J. M. M.; Pybus, B.; Ringe, D.; Petsko, G. A.; Boxer, S. G.; Herschlag, D. Proc. Natl. Acad. Sci. USA 2013, 110, E2552-E2561. [DOI]

We use 13C NMR and IR spectroscopy to characterize coupled proton transfers across a hydrogen bond network inside an enzyme active site. Proton transfer in this setting does not follow canonical titration curves, but is well explained by a model we develop.

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