Effect of Enzyme–Substrate Interactions Away from the Reaction Site on Carboxypeptidase A Catalysis
摘要:
The kinetics of 14 peptide substrates of carboxypeptidase A have been studied for the purpose of evaluating P-1-P-3/S-1-S-3 interactions. It was found that the amide group at P-1-P-2 is required for efficient catalysis. This observation is consistent with previously proposed hydrogen bonding interactions, based on crystallographic data, between the P-1 NH and Tyr-248 and between the P-2 carbonyl oxygen and Arg-71. In contrast, substitution of the benzamido amide group (at P-2-P-3) Of N-benzoylglycylglycyl-1-phenylalanine by -CH2CH2- resulted in more effective catalysis. In this case hydrophobic interactions are important in the ground state and in the transition state of the rate-determining step. (C) 1996 Academic Press. Inc.
Effect of Enzyme–Substrate Interactions Away from the Reaction Site on Carboxypeptidase A Catalysis
摘要:
The kinetics of 14 peptide substrates of carboxypeptidase A have been studied for the purpose of evaluating P-1-P-3/S-1-S-3 interactions. It was found that the amide group at P-1-P-2 is required for efficient catalysis. This observation is consistent with previously proposed hydrogen bonding interactions, based on crystallographic data, between the P-1 NH and Tyr-248 and between the P-2 carbonyl oxygen and Arg-71. In contrast, substitution of the benzamido amide group (at P-2-P-3) Of N-benzoylglycylglycyl-1-phenylalanine by -CH2CH2- resulted in more effective catalysis. In this case hydrophobic interactions are important in the ground state and in the transition state of the rate-determining step. (C) 1996 Academic Press. Inc.
Rivett, Donald E.; Stewart, Frederick H. C., Australian Journal of Chemistry, 1980, vol. 33, # 3, p. 625 - 631
作者:Rivett, Donald E.、Stewart, Frederick H. C.
DOI:——
日期:——
MCEVOY, F. J.;ALBRIGHT, J. D.
作者:MCEVOY, F. J.、ALBRIGHT, J. D.
DOI:——
日期:——
US4435329A
申请人:——
公开号:US4435329A
公开(公告)日:1984-03-06
Effect of Enzyme–Substrate Interactions Away from the Reaction Site on Carboxypeptidase A Catalysis
作者:John F. Sebastian、Guiqing Liang、Annissa Jabarin、Karen Thomas、H.Bonnie Wu
DOI:10.1006/bioo.1996.0026
日期:1996.9
The kinetics of 14 peptide substrates of carboxypeptidase A have been studied for the purpose of evaluating P-1-P-3/S-1-S-3 interactions. It was found that the amide group at P-1-P-2 is required for efficient catalysis. This observation is consistent with previously proposed hydrogen bonding interactions, based on crystallographic data, between the P-1 NH and Tyr-248 and between the P-2 carbonyl oxygen and Arg-71. In contrast, substitution of the benzamido amide group (at P-2-P-3) Of N-benzoylglycylglycyl-1-phenylalanine by -CH2CH2- resulted in more effective catalysis. In this case hydrophobic interactions are important in the ground state and in the transition state of the rate-determining step. (C) 1996 Academic Press. Inc.