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Bioorg Med Chem Lett. 2010 Jan 15;20(2):444-7. doi: 10.1016/j.bmcl.2009.12.001. Epub 2009 Dec 4.

Protection of a single-cysteine redox switch from oxidative destruction: On the functional role of sulfenyl amide formation in the redox-regulated enzyme PTP1B.

Author information

1
Department of Chemistry, University of Missouri-Columbia, Columbia, MO 65211, USA.

Abstract

Model reactions offer a chemical mechanism by which formation of a sulfenyl amide residue at the active site of the redox-regulated protein tyrosine phosphatase PTP1B protects the cysteine redox switch in this enzyme against irreversible oxidative destruction. The results suggest that 'overoxidation' of the sulfenyl amide redox switch to the sulfinyl amide in proteins is a chemically reversible event, because the sulfinyl amide can be easily returned to the native cysteine thiol residue via reactions with cellular thiols.

PMID:
20015650
PMCID:
PMC2886500
DOI:
10.1016/j.bmcl.2009.12.001
[Indexed for MEDLINE]
Free PMC Article

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