Specific and reversible inactivation of protein tyrosine phosphatases by hydrogen peroxide: evidence for a sulfenic acid intermediate and implications for redox regulation

Biochemistry
J M Denu, K G Tanner

Abstract

Protein tyrosine phosphatases (PTPs) catalyze the hydrolysis of phosphotyrosine from specific signal-transducing proteins. Although regulatory mechanisms for protein kinases have been described, no general mechanism for controlling PTPs has been demonstrated. Numerous reports have shown that cellular redox status plays an important role in tyrosine phosphorylation-dependent signal transduction pathways. This study explores the proposal that PTPs may be regulated by reversible reduction/oxidation involving cellular oxidants such as hydrogen peroxide (H2O2). Recent reports indicated that H2O2 is transiently generated during growth factor stimulation and that H2O2 production is concomitant with relevant tyrosine phosphorylation. By use of recombinant enzymes, the effects of H2O2 on three PTPs [PTP1, LAR (leukocyte antigen-related), and VHR (vaccinia H1-related)] and three distinct serine/threonine protein phosphatases (PPs: PP2Calpha, calcineurin, and lambda phosphatase) were determined. Hydrogen peroxide had no apparent effect on PP activity. In contrast, PTPs were rapidly inactivated (kinact = 10-20 M-1 s-1) with low micromolar concentrations of H2O2 but not with large alkyl hydroperoxides. PTP inactivation was fully reversible ...Continue Reading

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