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Inhibition of cathepsin B and papain by peptidyl alpha-keto esters, alpha-keto amides, alpha-diketones, and alpha-keto acids.

Abstract：

:A series of peptidyl alpha-keto esters, alpha-keto amides, alpha-keto acids, and alpha-diketones were synthesized which reversibly inhibit papain and cathepsin B. Methyl 3-(N-benzyloxycarbonyl-L-phenylalanyl)amino-2-oxopropionate (a dicarbonyl compound) inhibits papain with a Ki value of 1 microM, whereas the Ki of 3-(N-acetyl-L-phenylalanyl)aminopropanone (a monocarbonyl compound) is 1.5 mM (M. R. Bendall et al., 1979. Eur. J. Biochem. 79, 201-209). Both carbonyl groups are required for effective inhibition. Extension of these inhibitors by addition of P substituents (e.g., hexyl) does not affect the Ki for papain, but reduces Ki for cathepsin B 33-fold. For these two enzymes slow binding inhibition was observed with slow on rates (kappa on, 5.2 X 10(2) M-1 s-1 for papain, and 2.7 X 10(3) M- s-1 for cathepsin B). Addition of a P3 substituent (glycine) has no effect on Ki. We propose that the mechanism of inhibition involves the formation of a hemithioketal by addition of the active-site thiol to the carbonyl group of the inhibitor closer to the N-terminus. The hemithioketal intermediate is most likely stabilized by the electron withdrawing effect of the second carbonyl group.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Hu LY,Abeles RH

doi

10.1016/0003-9861(90)90443-3

subject

Has Abstract

pub_date

1990-09-01 00:00:00

pages

271-4

issue

2

eissn

0003-9861

issn

1096-0384

pii

0003-9861(90)90443-3

journal_volume

281

pub_type

杂志文章

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