deoxyribonucleic acid linked residue modified L-proline residue N-(DNA-1',2'-dideoxyribos-1'-ylidene)-L-prolinium (1Z,2S)-2-carboxy-1-[(3R,4R)-3,4-dihydroxy-5-(phosphonooxy)pentylidene]pyrrolidinium 1+ A protein modification that effectively crosslinks an N-terminal L-proline residue and a strand of DNA at the C-1 of a ribose, freeing the nucleotide base and forming N-(DNA-1',2'-dideoxyribos-1'-ylidene)-L-prolinium. DNA glycosylase proline Schiff base intermediate MOD:01454 N-(DNA-1',2'-dideoxyribos-1'-ylidene)-L-prolinium N-term P PSI-MOD This linkage is not a Schiff-base [JSG]. natural