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Mammalian fatty acid synthase is a classic example of a chain-building multienzyme. A cornerstone of its mechanism has been the obligatory collaboration of two identical subunits, with fatty acyl intermediates transferring between them. Now, fresh evidence has upset this view.
The actinomycete Amycolatopsis mediterranei produces the commercially and medically important polyketide antibiotic rifamycin, which is widely used against mycobacterial infections. The rifamycin biosynthetic (rif) gene cluster has been isolated, cloned and characterized from A. mediterranei S699 and A. mediterranei LBGA 3136. However, there are several other strains of A. mediterranei which also...
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