L-cysteine persulfide (R)-2-amino-3-disulfanylpropanoic acid 134.98126220703125 135.1999969482421875 2-amino-3-disulfanylpropanoic acid 2-amino-3-hydrodisulfidopropanoic acid 2-amino-3-hydropersulfidopropanoic acid 2-amino-3-persulfhydrylpropanoic acid 3-(thiosulfeno)-alanine 3-disulfanylalanine 31.972070693969726562 32.060001373291015625 A protein modification that effectively replaces the hydrogen atom of a cysteine sulfanyl group with a sulfanyl group, forming a disulfanyl group, and converting an L-cysteine residue to L-cysteine persulfide. ACT_SITE Cysteine persulfide intermediate C C 0 H 0 N 0 O 0 S 1 C 3 H 5 N 1 O 1 S 2 L-cysteine persulfide MOD:00274 MOD_RES Cysteine persulfide PSI-MOD S-mercaptocysteine S-sulfanylcysteine Sulfide Unimod:421 natural persulfide thiocysteine uniprot.ptm:PTM-0106 modified L-cysteine residue thiolated residue