Describe the mechanism of chymotrypsin in cleaving a peptide bond, highlighting the roles of the catalytice triad for the two phases of the catalytic reactions. Explain the significance of the oxyanion hole for the catalysis. (i) (ii) All serine proteases contain the catalytic triad and these amino acids are positioned in the exact same conformation. Since this is true, why do trypsin and chymotrypsin have such different substrate specificity? What features of the enzyme allow for this situation?

Biochemistry
6th Edition
ISBN:9781305577206
Author:Reginald H. Garrett, Charles M. Grisham
Publisher:Reginald H. Garrett, Charles M. Grisham
Chapter25: Nitrogen Acquisition And Amino Acid Metabolism
Section: Chapter Questions
Problem 19P
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(i)
Describe the mechanism of chymotrypsin in cleaving a peptide bond, highlighting the
roles of the catalytice triad for the two phases of the catalytic reactions. Explain the
significance of the oxyanion hole for the catalysis.
(ii)
All serine proteases contain the catalytic triad and these amino acids are positioned in
the exact same conformation. Since this is true, why do trypsin and chymotrypsin
have such different substrate specificity? What features of the enzyme allow for this
situation?
Transcribed Image Text:(i) Describe the mechanism of chymotrypsin in cleaving a peptide bond, highlighting the roles of the catalytice triad for the two phases of the catalytic reactions. Explain the significance of the oxyanion hole for the catalysis. (ii) All serine proteases contain the catalytic triad and these amino acids are positioned in the exact same conformation. Since this is true, why do trypsin and chymotrypsin have such different substrate specificity? What features of the enzyme allow for this situation?
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