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Irreversible inhibition of serine proteases by peptide derivatives of (alpha-aminoalkyl)phosphonate diphenyl esters.

Abstract：

:Peptidyl derivatives of diphenyl (alpha-aminoalkyl)phosphonates have been synthesized and are effective and specific inhibitors of serine proteases at low concentrations. Z-PheP(OPh)2 irreversibly reacts with chymotrypsin (kobsd/[I] = 1200 M-1 s-1) and does not react with two elastases. The best inhibitor for most chymotrypsin-like enzymes including bovine chymotrypsin, cathepsin G, and rat mast cell protease II is the tripeptide Suc-Val-Pro-PheP(OPh)2 which corresponds to the sequence of an excellent p-nitroanilide substrate for several chymases. The valine derivative Z-ValP(OPh)2 is specific for elastases and reacts with human leukocyte elastase (HLE, 280 M-1 s-1) but not with chymotrypsin. The tripeptide Boc-Val-Pro-ValP(OPh)2, which has a sequence found in a good trifluoromethyl ketone inhibitor of HLE, is the best inhibitor for HLE (kobsd/[I] = 27,000 M-1 s-1) and porcine pancreatic elastase (PPE, kobsd/[I] = 11,000 M-1 s-1). The rates of inactivation of chymotrypsin by MeO-Suc-Ala-Ala-Pro-PheP(OPh)2 and PPE and HLE by MeO-Suc-Ala-Ala-Pro-ValP(OPh)2 were decreased 2-5-fold in the presence of the corresponding substrate, which demonstrates active site involvement. Only one of two diastereomers of Suc-Val-Pro-PheP(OPh)2 reacts with chymotrypsin (146,000 M-1 s-1), and the enzyme-inhibitor complex had one broad signal at 25.98 ppm in the 31P NMR spectrum corresponding to the Ser-195 phosphonate ester. Phosphonylated serine proteases are extremely stable since the half-time for reactivation was greater than 48 h for the inhibited elastases and 7.5-26 h for chymotrypsin.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Biochemistry

journal_title

Biochemistry

authors

Oleksyszyn J,Powers JC

doi

10.1021/bi00216a026

subject

Has Abstract

pub_date

1991-01-15 00:00:00

pages

485-93

issue

2

eissn

0006-2960

issn

1520-4995

journal_volume

30

pub_type

杂志文章

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