2-(S-L-cysteinyl)pyruvic acid O-phosphothioketal (2R)-2-amino-3-[1-carboxy-1-(phosphonooxy)ethyl]sulfanylpropanoic acid 167.9823760986328125 168.0399932861328125 2-(S-L-cysteinyl)pyruvic acid O-phosphothioketal 2-([(2R)-2-amino-2-carboxyethyl]sulfanyl)-2-(phosphonooxy)propanoic acid 2-([(2R)-2-azanyl-2-carboxyethyl]sulfanyl)-2-(phosphonooxy)propanoic acid 270.991546630859375 271.17999267578125 C C 3 H 5 N 0 O 6 P 1 S 0 C 6 H 10 N 1 O 7 P 1 S 1 MOD:00797 MOD_RES 2-(S-cysteinyl)pyruvic acid O-phosphothioketal PSI-MOD S-[1-carboxy-1-(phosphonooxy)ethyl]cysteine SPEPCys a protein modification that effectively converts an L-cysteine residue to the PEP adduct, 2-(S-L-cysteinyl)pyruvic acid O-phosphothioketal cysteinyl pyruvate O-phosphothioketal natural phosphoenolpyruvate cysteine adduct phospholactoyl cysteine adduct uniprot.ptm:PTM-0424 phosphorus containing modified residue modified L-cysteine residue