Temporary inhibition of papain by hairpin loop mutants of chicken cystatin. Distorted binding of the loops results in cleavage of the Gly(9)-Ala10 bond.

Abstract:

:Temporary inhibition of the cysteine proteinases papain and cathepsin L was observed with several hairpin loop mutants of recombinant chicken cystatin at enzyme concentrations above nanomolar. Kinetic modelling of inhibition data, gel electrophoresis and amino acid sequencing revealed that reappearance of papain activity is due to selective cleavage of the Gly(9)-Ala10 bond in the N-terminal binding area of the chicken cystatin variants, resulting in truncated inhibitors of lower affinity. Cleavage of the same bond by contaminating papaya proteinase IV was ruled out by previous purification of papain and suitable control experiments. According to the proposed kinetic model, cleavage occurs within the enzyme-inhibitor complex with first order rate constants ktemp of 2.3 x 10(-3) up to 5 x 10(-1) s-1. A similar ktemp/Km ratio was found for all mutants (0.7 x 10(6)-2.1 x 10(6) s-1.M-1); it is almost identical with the kcat/Km ratio of the peptide substrate Z-Phe-Arg-NHMec. These results suggest that distorted contacts of one of the hairpin loops affect binding of the N-terminal contact area in a way that covalent interaction of the Gly(9)-Ala10 bond with the active-site Cys residue of papain can occur and the bond is cleaved in a substrate-like manner.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Machleidt W,Nägler DK,Assfalg-Machleidt I,Stubbs MT,Fritz H,Auerswald EA

doi

10.1016/0014-5793(95)00174-8

subject

Has Abstract

pub_date

1995-03-20 00:00:00

pages

185-90

issue

2-3

eissn

0014-5793

issn

1873-3468

pii

0014-5793(95)00174-8

journal_volume

361

pub_type

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