Inhibition of protein tyrosine phosphatases by low-molecular-weight S-nitrosothiols and S-nitrosylated human serum albumin.

Abstract:

:The homogeneous recombinant mammalian protein tyrosine phosphatase 1B (PTP1B) and Yersinia protein tyrosine phosphatase (PTPase) are inactivated by a series of low-molecular-weight S-nitrosothiols. These compounds exhibited different inhibitory activities in a time- and concentration-dependent manner with second-order rate constants (k(inact)/K(I)) ranging from 37 to 113 M(-1) min(-1) against mammalian PTP1B and from 66 to 613 M(-1) min(-1) against Yersinia PTPase. Furthermore, the inactivation of Yersinia PTPase by S-nitrosylated protein:S-nitroso human serum albumin was investigated. Both single-S-nitrosylated and poly-S-nitrosylated human serum albumin show good inhibitory ability to Yersinia PTPase. The second-order rate constants are 472 and 1188 M(-1) min(-1), respectively. This result indicates a possibility that S-nitrosylated albumin in vivo may function as an inhibitor for a variety of cysteine-dependent enzymes.

authors

Xian M,Wang K,Chen X,Hou Y,McGill A,Zhou B,Zhang ZY,Cheng JP,Wang PG

doi

10.1006/bbrc.2000.2117

subject

Has Abstract

pub_date

2000-02-16 00:00:00

pages

310-4

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(00)92117-X

journal_volume

268

pub_type

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