Part2Enzymes
Enzymes Part2
Enzyme kinetics as an approach to understandingmechanism
Enzyme kinetics as an approach to understanding mechanism
SubstrateConcentration AffectstheRate ofEnzyme-Catalyzed Reactionspre-steadystate=initialtransientperiodduringwhichESbuildsupsteadystate=periodduring which [ES] andotherintermediatesLEremainconstant[ES]steady-statekinetics=TimethetraditionalanalysisofPre-steadySteadystatestatereactionrates
Pre-Steady State KineticsCan ProvideEvidenceforSpecificReactionStepsusedtomeasurerateconstantsofindividualstepsstopped-flowdeviceallowsmixingandsamplingonasecondormillisecondtimeAbsorbuenascaleFiowceWast
Dissociation of the Product is Rate.Limiting for Many Enzymesforanenzymewhereproductrelease,EP→E+P,israte-limiting (k,israte-limiting):k3k2kE+S=ES(6-28)EP=E+P1k_1k-2