pyridinyl ring crosslinked residues L-cysteine 3-hydroxy-2,5-pyridinedicarboxylic acid -54.05550384521484375 -54.06999969482421875 223.017730712890625 223.2299957275390625 MOD:01814 H -8 N -1 O -2 C 9 H 7 N 2 O 3 S 1 6-[1-azanyl-2-sulfanylethyl]-3-hydroxypyridine-2,5-dicarboxylic acid A protein modification that effectively cross-links a cysteine and two serine residues to form L-cysteine 3-hydroxy-2,5-pyridinedicarboxylic acid. natural 6-[(1R)-1-amino-2-sulfanylethyl]-3-hydroxypyridine-2,5-dicarboxylic acid Cross-link 3. C, S, S L-cysteine 3-hydroxy-2,5-pyridinedicarboxylic acid CROSSLNK 3-hydroxypyridine-2,5-dicarboxylic acid (Ser-Cys) PSI-MOD none crosslinked L-cysteine residue crosslinked L-serine residue