Table 2.

Statistics of cysteine post-translation modifications in this database.

Cysteine-post translational modifications (PTM)	Number of entries	Reactions
Metal-binding (−S-Mn+)	1113	Prot-SH + M+ → Prot-S—M
Disulfide (−S = S−)	761	Prot-SH + P'SH → Prot-S = S-Prot' + H2O
Palmitoylation (−S-(CH2)nCOOH)	55	Prot-SH + -(CH2)nCOOH → Prot-S-(CH2)nCOOH
Sulfenylation (−SOH)	27	Prot-SH + H2O2 → Prot-SOH + H2O
Nitrosylation (−SNO)	18	Prot-SH + NO• → Prot-SNO + H+
Thioester (−S-COR)	8	Prot-SH + -COR → Prot-S-COR
Glutathionylation (−SSG)	3	Prot-SH + GSSG → Prot-SSG + GSH