The protein synthesis elongation factor Tu (EF-Tu) was identified in dormant spores of Streptomyces aureofaciens and its content and distribution in vegetative cells and dormant spores were determined. Cell-free homogenates from spores were found to contain a EF-Tu cleaving membrane bound protease. The protease cleaved aggregated EF-Tu much less efficiently than non-aggregated factor in cell homogenates. The relative content of EF-Tu and ribosomes in dormant spores was very similar to that found in exponentially growing vegetative cells.

Institute of Microbiology Czechoslovak Academy of Sciences Prague

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