A research group discovers a new version of the rainbowase enzyme, which they call rainbowase*, that catalyzes the chemical reaction: RAIN rainbows The researchers began to characterize the enzyme. a) In the 1st experiment, with [E] at 4 nM, they find that the Vmax is 1.6 µM s-1. Based on this experiment, what is the kcat for rainbowase*? (include units and show work).

Chemistry for Engineering Students
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ISBN:9781285199023
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter11: Chemical Kinetics
Section: Chapter Questions
Problem 11.61PAE
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A research group discovers a new version of the rainbowase enzyme, which they
call rainbowase*, that catalyzes the chemical reaction:
RAIN
rainbows
The researchers began to characterize the enzyme.
a) In the 1st experiment, with [E] at 4 nM, they find that the Vmax is 1.6 uM s-1. Based on this
experiment, what is the kcat for rainbowase*? (include units and show work).
b) In another experiment, the [E] at 1 nM and [RAIN] at 30 µM, the researchers find that V.
= 300 nM s-1. What is the measure KM for rainbowase* for its substrate RAIN? (include
units and show work).
Transcribed Image Text:A research group discovers a new version of the rainbowase enzyme, which they call rainbowase*, that catalyzes the chemical reaction: RAIN rainbows The researchers began to characterize the enzyme. a) In the 1st experiment, with [E] at 4 nM, they find that the Vmax is 1.6 uM s-1. Based on this experiment, what is the kcat for rainbowase*? (include units and show work). b) In another experiment, the [E] at 1 nM and [RAIN] at 30 µM, the researchers find that V. = 300 nM s-1. What is the measure KM for rainbowase* for its substrate RAIN? (include units and show work).
c) Further research shows that the purified rainbowase* used in the first two experiments
was actually contaminated with a reversible inhibitor called "NO RAIN, NO rainbows".
When “NO RAIN, NO rainbows" is carefully removed from the rainbowase* preparation,
and the two experiments are repeated, the measured Vmax in (a) is increased to
4.8 µM -1, and the measured KM is (b) is now 15 µM. For the inhibitor "NO RAIN, NO
rainbows", calculate the values of a and a'.
d) Based on the information given above, what type of inhibitor is "NO RAIN, NO rainbows"?
(competitive, uncompetitive, mixed inhibitor, or other)?
Transcribed Image Text:c) Further research shows that the purified rainbowase* used in the first two experiments was actually contaminated with a reversible inhibitor called "NO RAIN, NO rainbows". When “NO RAIN, NO rainbows" is carefully removed from the rainbowase* preparation, and the two experiments are repeated, the measured Vmax in (a) is increased to 4.8 µM -1, and the measured KM is (b) is now 15 µM. For the inhibitor "NO RAIN, NO rainbows", calculate the values of a and a'. d) Based on the information given above, what type of inhibitor is "NO RAIN, NO rainbows"? (competitive, uncompetitive, mixed inhibitor, or other)?
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