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We previously constructed a heterologous production system for ergothioneine (ERG) in Escherichia coli using five ERG biosynthesis genes (egtABCDE) from Mycobacterium smegmatis. However, significant amounts of hercynine (HER), an intermediate of ERG, as ERG were accumulated, suggesting that the reaction of EgtB catalyzing the attachment of γ-glutamylcysteine (γGC) to HER to yield hercynyl-γ-glutamylcysteine sulfoxide was a bottleneck. In this study, we searched for other EgtBs and found many egtB orthologs in diverse microorganisms. Amon
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