Enzyme activity: E + S ↔ ES → EP ↔ E + P. Identify what each letter represents and describe the above equation in words. In which step of this process does the substrate transiently pass through a transition state? What is a transition state, and how does it relate to the activation energy of the reaction? Describe the process that must take place for a non-enzyme-catalyzed reaction to proceed, and specifically what the enzyme does to make the process easier.
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Step 1: Identify what each letter represents in the equation: - **E**: Enzyme - **S**: Substrate - **ES**: Enzyme-Substrate complex - **EP**: Enzyme-Product complex - **P**: Product Show more…
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a) For an enzyme-catalyzed reaction: E+S ⇌ ES ⇌ E+P, draw and label a reaction coordinate diagram. On your diagram, draw and label each stage in the reaction progress (S, ES, ES‡ , ∆G‡ , ∆Gʹo, P). b) What is the effect on the overall rate of the reaction if the enzyme substrate intermediate (ES) is stabilized, so that it now has a lower free energy value than substrate itself (draw this on your diagram above)? Why?
Adi S.
Describe enzyme catalysis as a series of steps, with $E$ symbolizing the enzyme and $S$ symbolizing the substrate.
Simple enzyme reactions often conform to the equation \[E+S \rightleftharpoons E S \rightarrow E P \rightleftharpoons E+P\] where $\mathrm{E}, \mathrm{S},$ and $\mathrm{P}$ are enzyme, substrate, and product, respectively. A. What does ES represent in this equation? B. Why is the first step shown with bidirectional arrows and the second step as a unidirectional arrow? C. Why does E appear at both ends of the equation? D. One often finds that high concentrations of $P$ inhibit the enzyme. Suggest why this might occur. E. If compound X resembles $\mathrm{S}$ and binds to the active site of the enzyme but cannot undergo the reaction catalyzed by it, what effects would you expect the addition of $x$ to the reaction to have? Compare the effects of $X$ and of the accumulation of P.
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