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Schematic diagram of surfactin synthetase complex for biosynthesis of cyclic surfactin. Surfactin synthetase complex is composed of three-modular SrfA, three-modular SrfB, mono-modular SrfC and SrfD subunits, which is used to synthesize seven amino acids of surfactin. The peptide chain is elongated from left to right until the linear product is cyclized by TE domain.
