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The last decade has witnessed an increased interest in cysteine modifications such as sulfenic and sulfinic acids, thiyl radicals, sulfenyl-amides and thiosulfinates, which come together to enable redox sensing, activation, catalysis, switching and cellular signalling. While glutathionylation, sulfenyl-amide formation and disulfide activation are examples of relatively simple redox responses, the sulfinic acid switch in peroxiredoxin enzymes is part of a complex signalling system that involves sulfenic and sulfinic acids and interacts with kinases and sulfiredoxin. Although the  in vivo  evaluation of sulfur species is still complicated by a lack of appropriate analytical techniques, research into biological sulfur species has gained considerable momentum and promises further excitement in the future.

Aspects of the biological redox chemistry of cysteine: from simple redox responses to sophisticated signalling pathways