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- W2120118196 abstract "Single molecule fluorescence spectroscopy offers great potential for studying enzyme kinetics. A number of fluorescence reporter systems allow for monitoring the sequence of individual reaction events with a confocal microscope. When using a time-correlated single photon counting (TCSPC) detection scheme, additional information about the fluorescence lifetimes of the fluorophores can be obtained. We have applied a TCSPC detection scheme for studying the kinetics of α-chymotrypsin hydrolyzing a double-substituted rhodamine 110-based fluorogenic substrate in a two-step reaction. On the basis of the lifetime information, it was possible to discriminate the intermediate and the final product. At the high substrate concentration used, only the formation of the intermediate was observed. No rebinding of the intermediate followed by rhodamine 110 formation occurred at these high concentrations. We have further found no alterations in the fluorescence lifetime of this intermediate that would indicate changes in the local environment of the fluorophore originating from strong interactions with the enzyme. Our results clearly show the power of using lifetime-resolved measurements for investigating enzymatic reactions at the single molecule level." @default.
- W2120118196 created "2016-06-24" @default.
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- W2120118196 date "2013-01-25" @default.
- W2120118196 modified "2023-10-17" @default.
- W2120118196 title "Time-Resolved Single Molecule Fluorescence Spectroscopy of an α-Chymotrypsin Catalyzed Reaction" @default.
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- W2120118196 doi "https://doi.org/10.1021/jp310663v" @default.
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