1-thioglycine (internal) 1-thioglycine 15.977155685424804688 16.059999465942382812 2-amino-1-sulfanylethanone 72.99861907958984375 73.1100006103515625 A protein modification that effectively converts a glycine residue to an internal 1-thioglycine. C 0 H 0 N 0 O -1 S 1 C 2 H 3 N 1 S 1 Carboxy->Thiocarboxy G MOD:00270 MOD_RES 1-thioglycine PSI-MOD S(O)Gly This modification occurs naturally in two forms. At an interior peptide location it exists as aminoethanethionic acid (or aminoethanethioic O-acid). At the carboxyl-terminal it exists as aminoethanethiolic acid (or aminoethanethioic S-acid). aminoethanethioic O-acid aminoethanethioic acid aminoethanethionic acid aminothioacetic acid natural thiocarboxylic acid uniprot.ptm:PTM-0004 1-thioglycine