The enzyme carboxypeptidase€™s catalyses the hydrolysis of polypeptides and here we consider its inhibition. The following results were obtained when the rate of the enzymolysis of carbobenzoxy-glycyl-D-phenylalanine (CBGP) was monitored without inhibitor: (All rates in this problem were measured with the same concentration of enzyme and are relative to the rate measured when [CBGP] a = 0.0713 mol dm-3 in the absence of inhibitor.) When 2.0 x 10-3 mol dm-3 phenyl butyrate ion was added to a solution containing the enzyme and substrate, the following results were obtained: In a separate experiment, the effect of 5.0 x 10-2 mol dm? benzoate ion was monitored and the results were: Determine the mode of inhibition of carboxypeptidase€™s by the phenyl butyrate ion and benzoate ion,

Transcribed Image Text:

[CBGP),/(10- mol dm-) Relative reaction rate (CBGP,/(10-2 mol dm-) Relative reaction rate 3.84 5.81 1.25 7.13 0,859 0.669 1.000 0.398 4.00 1.25 5.50 2.50 0.172 0.344 0.548 0.301 ICBGP),/(10- mol dm-) Relative reaction rate 1.75 2.50 10.00 5.00 0.183 0.201 0.246 0.231