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. 1996 Dec;178(24):7276–7284. doi: 10.1128/jb.178.24.7276-7284.1996

Induction of actinorhodin production by rpsL (encoding ribosomal protein S12) mutations that confer streptomycin resistance in Streptomyces lividans and Streptomyces coelicolor A3(2).

J Shima 1, A Hesketh 1, S Okamoto 1, S Kawamoto 1, K Ochi 1
PMCID: PMC178644  PMID: 8955413

Abstract

A strain of Streptomyces lividans, TK24, was found to produce a pigmented antibiotic, actinorhodin, although S. lividans normally does not produce this antibiotic. Genetic analyses revealed that a streptomycin-resistant mutation str-6 in strain TK24 is responsible for induction of antibiotic synthesis. DNA sequencing showed that str-6 is a point mutation in the rpsL gene encoding ribosomal protein S12, changing Lys-88 to Glu. Gene replacement experiments with the Lys88-->Glu str allele demonstrated unambiguously that the str mutation is alone responsible for the activation of actinorhodin production observed. In contrast, the strA1 mutation, a genetic marker frequently used for crosses, did not restore actinorhodin production and was found to result in an amino acid alteration of Lys-43 to Asn. Induction of actinorhodin production was also detected in strain TK21, which does not harbor the str-6 mutation, when cells were incubated with sufficient streptomycin or tetracycline to reduce the cell's growth rate, and 40 and 3% of streptomycin- or tetracycline-resistant mutants, respectively, derived from strain TK21 produced actinorhodin. Streptomycin-resistant mutations also blocked the inhibitory effects of relA and brgA mutations on antibiotic production, aerial mycelium formation or both. These str mutations changed Lys-88 to Glu or Arg and Arg-86 to His in ribosomal protein S12. The decrease in streptomycin production in relC mutants in Streptomyces griseus could also be abolished completely by introducing streptomycin-resistant mutations, although the impairment in antibiotic production due to bldA (in Streptomyces coelicolor) or afs mutations (in S. griseus) was not eliminated. These results indicate that the onset and extent of secondary metabolism in Streptomyces spp. is significantly controlled by the translational machinery.

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Selected References

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