R :X 2 X R A. Inspect the figure. Draw a reaction coordinate diagram (energy vs reaction progress) that shows the enzyme- catalyzed reaction (as shown above) and uncatalyzed reaction. Make sure your sketch accurately reflects relative free energies of various species. B. What are the chemical roles of 1 and 2 in the enzyme-catalyzed reaction shown in Model 3? C. Propose specific amino acid side chains that could best serve the functions of 1 and 2 in the enzyme depicted in Model 3. Justify your choices.

Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter14: Chemical Kinetics: The Rates Of Chemical Reactions
Section14.7: Reaction Mechanisms
Problem 1.2ACP
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General method used by enzymes to catalyze the first step of a 1,4-elimination reaction. In this figure, 1 and 2 are
generic proton donors and acceptors that are part of the enzyme active site. The rest of the polypeptide chain, which
surrounds the substrate in the active site and sequesters it from bulk solvent, is not shown for clarity.
H
you ₁
XH
R
:X
2
rpm,
1
OH
R
XH
2
A. Inspect the figure. Draw a reaction coordinate diagram (energy vs reaction progress) that shows the enzyme-
catalyzed reaction (as shown above) and uncatalyzed reaction. Make sure your sketch accurately reflects relative
free energies of various species.
B. What are the chemical roles of 1 and 2 in the enzyme-catalyzed reaction shown in Model 3?
C. Propose specific amino acid side chains that could best serve the functions of 1 and 2 in the enzyme depicted in
Model 3. Justify your choices.
Transcribed Image Text:General method used by enzymes to catalyze the first step of a 1,4-elimination reaction. In this figure, 1 and 2 are generic proton donors and acceptors that are part of the enzyme active site. The rest of the polypeptide chain, which surrounds the substrate in the active site and sequesters it from bulk solvent, is not shown for clarity. H you ₁ XH R :X 2 rpm, 1 OH R XH 2 A. Inspect the figure. Draw a reaction coordinate diagram (energy vs reaction progress) that shows the enzyme- catalyzed reaction (as shown above) and uncatalyzed reaction. Make sure your sketch accurately reflects relative free energies of various species. B. What are the chemical roles of 1 and 2 in the enzyme-catalyzed reaction shown in Model 3? C. Propose specific amino acid side chains that could best serve the functions of 1 and 2 in the enzyme depicted in Model 3. Justify your choices.
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