FIELD: biotechnology.
SUBSTANCE: l-cysteine is produced by cultivation of bacteria belonging to genus Escherichia transformed with DNA encoding mutant serine-acetyl transferase, wherein said serine-acetyl transferase has one or more mutations in natural sequence of serine-acetyl transferase from E.coli in sites from 89 to 96, and reduced feedback inhibition by L-cysteine.
EFFECT: high effective method for L-cysteine production.
6 cl, 5 dwg, 3 tbl, 4 ex
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