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1. Effect of new peptide inhibitors on the ratio of angiotensin I-converting and kinin-degrading activities of dipeptidyl carboxypeptidase (angiotensin-converting enzyme)

Author

E V, Kalinina, V F, Posdnev, N V, Komissarova, and O A, Gomazkov

Subjects
Kinetics, Semen, Swine, Hydrolysis, Microsomes, Animals, Angiotensin-Converting Enzyme Inhibitors, Angiotensin I, Peptidyl-Dipeptidase A, Bradykinin, Kidney, Lung, Rats
Abstract

The effect of N(alpha)-carboxyalkylated dipeptides on angiotensin-converting and kinin-degrading activity of angiotensin-converting enzyme (ACE, dipeptidyl carboxypeptidase) was studied. These inhibitors selectively affected ACE-induced hydrolysis of angiotensin I-like and bradykinin-like (hippuryl-His-Leu and hippuryl-Phe-Arg, respectively) substrates in microsomal fractions of rat lungs and kidneys and rat blood serum. The inhibition constants of both types of activity were determined for these enzyme preparations and also for ACE from porcine seminal fluid and highly purified ACE from porcine lung. In all cases high inhibition selectivity of angiotensin-generating and kininase activities of ACE was found.

Published
1997

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