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.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Xian M,Wang K,Chen X,Hou Y,McGill A,Zhou B,Zhang ZY,Cheng JP,Wang PGdoi
10.1006/bbrc.2000.2117subject
Has Abstractpub_date
2000-02-16 00:00:00pages
310-4issue
2eissn
0006-291Xissn
1090-2104pii
S0006-291X(00)92117-Xjournal_volume
268pub_type
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