Asked Oct 13, 2019

The turnover number for an enzyme is known to be 5000min-1. Given the following set of data, 

Substrate concentration(mM)

1, 2, 4, 6, 100, 1,000

Initial Rate(micromol/min)

167, 250, 334, 376, 498, 499


a) What is the Kof the enzyme for the substrate? (do this without using a calculator)

b) What is the total amount of enzyme present in the assay?


Expert Answer

Step 1

Enzyme kinetics is defined as the study of chemical reactions which are catalyzed by enzymes. Km is the Michaelis constant and is very essential in determining of enzyme-substrate interaction.

Step 2

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(a) Km of the enzyme for the substrate: From the given data, the initial rate increases along with the increase in substrate concentration VImax is the maximum initial rate of a reaction. Maximum reaction rate 499 umol/min Therefore, Vmax=499 umol/min Vmax 499 2 2 Vmax 249.5 umol/min 2 From the given data, the concentration of substrate is 2 mM when the initial rate of a reaction is 249.5 umol/min (approximately 250 umol/min) The Km is the substrate concentration at which the initial rate is equal to half of Vmax- Therefore, Km=2 mM


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