Summary: Downstream from the surfactin synthetase operon in a new operon-type structure has been localized which, on the basis of sequence determination, potentially encodes an ABC-type transport system. The 268 amino acid protein, the product of , represents the solute-binding component of the system whereas the product a 234 amino acid protein, is the transmembrane component. Finally potentially encodes a typical 241 amino acid ATP-binding protein involved in energy supply. Comparison of the three proteins with the subunits of other ABC-type systems suggests that this new system is involved in amino acid transport.


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