ABSTRACT
An asporogenous spontaneous mutant of Streptomyces aureofaciens named ASR1 was selected on streptomycin gradient plates. The mutant is very stable and differs in ultrastructure and morphology, it is prototrophic but it lost the ability to grow well on soybean extract medium and produces one-tenth tetracyclines of the parent. The ASR1 mutant has a 3-4-fold increased resistance to streptomycin and is cross-resistant to other aminoglycosides. Comparison of the protein profiles from both strains on SDS gels revealed a very low expression of a 29.5 kDa protein in the ASR1 mutant which is overexpressed in both vegetative cells and spores of the parental strain.
Subject(s)
Anti-Bacterial Agents/pharmacology , Streptomyces aureofaciens/drug effects , Streptomyces aureofaciens/genetics , Aminoglycosides , Bacterial Proteins/genetics , Bacterial Proteins/isolation & purification , Drug Resistance, Microbial/genetics , Mutation , Spores, Bacterial/genetics , Streptomyces aureofaciens/ultrastructure , Tetracycline/biosynthesisABSTRACT
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.
