To start with, write out the Michaelis-Menton equation. For Vmax and Km explain what these terms tell or do not tell about an enzymatic reaction. Also, explain what kcat and kcat/Km can tell you about the relative activity of an enzyme.
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10. Use the Michaelis-Menten equation to describe catalytic turnover (velocity) versus substrate concentration in a simple enzyme-catalyzed reaction. 11. Quantitatively (mathematically) and qualitatively (graphically) define Michaelis-Menten rates Vmax, kcat, Km, and kcat / Km. 12. Describe how the kinetic parameters relate to the reaction diagrams. 13. Explain how the rate-limiting step dictates the overall rate of the reaction.
Adi S.
The Michaelis-Menten equation is one of the fundamental equations describing the way single substrate enzymes behave. This equation is often represented as the following: v = Vmax[S] / (Km + [S]) v represents the rate of the reaction catalyzed by a certain enzyme, Vmax the maximum achievable rate of the reaction, Km represents the Michaelis-Menten constant, and [S] represents the concentration of substrate. Part I (20 points): Sketch the overall profile of Reaction Rate vs. Substrate Concentration. The Reaction Rate should be normalized to the maximum reaction rate, and the substrate concentration should range from 0 to 500 mM. Let Km = 15 mM and Vmax = 1 mM/s. Part II (30 points): Answer the following questions: a. What is the relationship between the maximum rate (Vmax) and the Michaelis-Menten constant (Km)? (10 points) b. Competitive inhibitors are molecules that bind to an enzyme’s active site. Which variable in the Michaelis-Menten equation do competitive inhibitors affect? Does that variable increase or decrease? (10 points) c. Many of the enzymes in oxidative phosphorylation follow the Michaelis-Menten kinetics described above. The proton pump ATPase that generates ATP using the proton concentration gradient in the mitochondria is an example. Assume that this ATPase uses the following parameters: Km = 15 mM and Vmax = 1 as before, and that the substrate concentration of ADP is usually 500 mM and it generates a given amount of ATP. Will the generation of ATP be significantly larger with [ADP] = 1000 mM? What about [ADP] = 10 × 10^6 mM? Briefly explain your answer. (10 points)
Sri K.
You can do this or IV: extra for doing both. A scientist isolated a new enzyme. He measured the initial rate (Vo) at different concentrations of the enzyme. The concentration used for all the measurements is 85 nM. The following substrate concentration [S] is plotted in the figure as the result. If the enzymatic reaction follows kinetics described by the Michaelis-Menten equation, please answer the following questions: - Estimate the Vmax of the enzymatic equation, show your work. - What is the Km of this enzymatic reaction? Show your work. - Calculate kcat based on the estimation above. - Calculate the initial reaction rate based on your Vmax and kcat values when [S] = 15 mM.
Madhur L.
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