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Serendipitous Discovery of Photolytic Thiosulfoxide Formation: Application for Visible-Light-Inducible Manipulation
Mitsuyasu Kawaguchi1, Katsutoshi Yoshino2, Tomoaki Ida3
1Graduate School of Pharmaceutical Sciences, Nagoya City University, 3-1 Tanabe-dori, Mizuho-ku, Nagoya, Aichi 467-8603, Japan.
Abstract:
Tools to enable spatiotemporally controlled upregulation of supersulfides, which are highly reactive, unstable sulfur species, are needed to study the pathophysiological roles of post-translational protein modification with catenated sulfur atoms. Here, we set out to design N,N-diethylaminocoumarin (DEAC)-based visible-light-responsive N-acetylcysteine persulfide donors (NAC-SS-DEAC), and serendipitously found that upon visible light irradiation, they donate a sulfane sulfur (S0) atom to nucleophiles, including thiols and cyanate. Light-assisted tautomerization of the disulfide moiety of NAC-SS-DEAC to transiently afford unstable thiosulfoxide plays a key role in the S0 donation. We show that this reaction can be utilized to achieve visible-light-inducible manipulation of supersulfide levels in living cells.
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