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Reactivity of sulfenic acid in human serum albumin.

Abstract：

:Sulfenic acid is formed upon oxidation of thiols and is a central intermediate in the redox modulation of an increasing number of proteins. Methods for quantifying or even detecting sulfenic acid are scarce. Herein, the reagent 7-chloro-4-nitrobenz-2-oxa-1,3-diazole was determined not to be suitable as a chromophoric probe for sulfenic acid in human serum albumin (HSA-SOH) because of lack of specificity. Thionitrobenzoate (TNB) reacted with HSA exposed to hydrogen peroxide, but not control or thiol-blocked HSA. The reaction was biphasic. The first phase was approximately 20-fold faster than the second phase and first order in HSA-SOH and TNB (105 +/- 11 M-1 s-1, 25 degrees C, pH 7.4), allowing quantitative data on HSA-SOH formation and reactivity to be obtained. Exposure of reduced HSA (0.5 mM) to hydrogen peroxide (4 mM, 37 degrees C, 4 min) yielded 0.18 +/- 0.02 mol of HSA-SOH per mol of HSA. HSA-SH reacted with hydrogen peroxide at 2.7 +/- 0.7 M-1 s-1 (37 degrees C, pH 7.4), while HSA-SOH reacted at 0.4 +/- 0.2 M-1 s-1, yielding sulfinic acid (HSA-SO2H), as detected by mass spectrometry. The rate constants of HSA-SOH with targets of analytical interest such as dimedone and sodium arsenite were determined. HSA-SOH did not react appreciably with the plasma reductants ascorbate or urate, nor with free basic amino acids. In contrast, HSA-SOH reacted rapidly with the plasma thiols cysteine, glutathione, homocysteine, and cysteinylglycine at 21.6 +/- 0.2, 2.9 +/- 0.5, 9.3 +/- 0.9, and 55 +/- 3 M-1 s-1 (25 degrees C, pH 7.4), respectively, supporting a role for HSA-SOH in the formation of mixed disulfides.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Turell L,Botti H,Carballal S,Ferrer-Sueta G,Souza JM,Durán R,Freeman BA,Radi R,Alvarez B

doi

10.1021/bi701520y

subject

Has Abstract

pub_date

2008-01-08 00:00:00

pages

358-67

issue

1

eissn

0006-2960

issn

1520-4995

journal_volume

47

pub_type

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