Abstract
cysA− mutants of Aspergillus nidulans lacking serine transacetylase were isolated. cysA− mutants are cysteine auxotrophs only when a second mutation either blocking cystathionine β-synthase (mecA−) or γ-cystathionase (mecB−) is present. These findings prove that homocysteine originating from O-acetylhomoserine and sulfide can be converted not only to methionine, but also to cysteine via the reverse trans-sulfurylation pathway.
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