Main Reaction: O-Acetyl serine + sulfide + thiosulfate >> acetate + cysteine + S-sulfocysteine + acetate

Reference: PubMed ID: 10613873
Authors: Kitabatake M, So MW, Tumbula DL, Söll D
Title: Cysteine biosynthesis pathway in the archaeon Methanosarcina barkeri encoded by acquired bacterial genes?
Published: 2000 Jan

O-Acetyl serine + sulfide + thiosulfate --> acetate + cysteine + S-sulfocysteine + acetate