O4'-sulfo-L-tyrosine (S)-2-amino-3-(4-sulfooxyphenyl)propanoic acid 2-amino-3-(4-hydroxyphenyl)propanoic acid 4'-sulfate 243.0201416015625 243.2299957275390625 79.956817626953125 80.05999755859375 A protein modification that effectively converts an L-tyrosine residue to O4'-sulfo-L-tyrosine. C 0 H 0 N 0 O 3 S 1 C 9 H 9 N 1 O 5 S 1 From DeltaMass: Average Mass: 80 Average Mass Change:80 PubMed:9624161. MOD:00181 MOD_RES Sulfotyrosine O-Sulfonation O4'-sulfo-L-tyrosine O4-sulfotyrosine OSulfTyr PSI-MOD Sulfo Sulphation (of O of Tyrosine) Tyrosinyl Sulphate Unimod:40 Y natural sulfationy tyrosine sulfate tyrosine-O-sulfonic acid tyrosine-O-sulphonic acid uniprot.ptm:PTM-0286 sulfated residue residues isobaric at 243.02-243.03 Da modified L-tyrosine residue