Abstract
Stopped-flow fluorescence spectroscopy is a highly sensitive method for measuring rapid enzyme kinetics. A wide range of fluorophores can be employed, and fluorescence and fluorescence polarization can be measured. Thus, binding, conformational changes, and catalysis can, in principle, be measured, making it helpful in probing the entire kinetic landscape of a reaction. In this chapter, we use the bacterial RNA processing enzyme ribonuclease P (RNase P) as a model system to illustrate the determination of the kinetic constants for substrate binding and cleavage, thus allowing mechanistic questions regarding the effects of reaction conditions, mutations, or drug binding to be answered.
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