期刊
ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS
卷 617, 期 -, 页码 3-8出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.abb.2016.09.012
关键词
Hydrogen sulfide; Disulfide; Disulfide(center dot-); Hydrogen disulfide; Oxoazane; Disulfane; Sulfuration; Transnitrosation; Oxidation-state diagram; Electrode potential; Gibbs energy of formation; Energetics
There is currently interest in sulfur-containing molecules that may or may not play a role in signaling. We have collected relevant thermodynamic data, namely standard Gibbs energies of formation and electrode potentials at pH 7, and used these to construct a Frost diagram. Thermodynamic data not available in the literature could be estimated with reasonable confidence. At pH 7, the electrode potential of the RSS center dot/RSS- couple is +0.68 V, 0.28 V less than that of the RS center dot, H+/RSH couple. S-2(center dot-) is unstable with respect to HSS- and S-2. Generally, polysulfur compounds, with the exception of RSSR, are thermodynamically unstable with respect to disproportionation and ultimately lead to formation of kinetically inert Sg(s). About thermoneutral is the formation of RSS- from RSSR and HS-, but formation of HNO- from HS- and SNO-(,) and from HS- and RSNO, is unfavorable. The formation of SSNO in vivo is kinetically unlikely. (C) 2016 Elsevier Inc. All rights reserved.
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