Elongation factor 4 is a widely distributed translational GTPase also known as LepA. Its physiological role is ambiguous, as only a few phenotypes resulting from lepA null mutations have been reported. Here, we report that a Streptomyces coelicolor lepA null mutant overproduces the calcium-dependent antibiotic (CDA). Our findings are the first that connect LepA (encoded by SCO2562) to antibiotic production. They lend additional evidence that perturbations in the quaternary structure and function of the ribosome can positively affect antibiotic production in Streptomyces bacteria.
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