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Cysteine thiol conjugation by meso-unsubstituted gold(III) porphyrins. (A) UPLC-QTOF-MS analysis of the thiolato adduct for the parent ion of [AuMesoIX–GSH)]+ at a retention time of 4.13 min. (B) 1H and (C) 1H–13C HMBC NMR spectra of [AuOEP–GSH)]+. (D) MALDI-TOF-MS spectra of thioredoxin (Trx) before and after reaction with AuMesoIX. (E) Schematic reaction for the bioconjugation of meso-unsubstituted gold(III) porphyrins with GSH under physiological conditions.
