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. 1990 Jun;172(6):3108–3116. doi: 10.1128/jb.172.6.3108-3116.1990

Streptomyces genes involved in biosynthesis of the peptide antibiotic valinomycin.

J B Perkins 1, S K Guterman 1, C L Howitt 1, V E Williams 2nd 1, J Pero 1
PMCID: PMC209114  PMID: 2345137

Abstract

We have identified genes from Streptomyces levoris A-9 involved in the biosynthesis of the peptide antibiotic valinomycin. Two segments of chromosomal DNA were recovered from genomic libraries, constructed by using the low-copy-number plasmid pIJ922, by complementation of valinomycin-deficient (vlm) mutants of S. levoris A-9. One set of plasmids restored valinomycin production to only one mutant, that carrying vlm-1, whereas a second set of plasmids restored productivity to seven vlm mutants, those carrying vlm-2 through vlm-8. Additional complementation studies using subcloned restriction enzyme fragments showed that the vlm-1+ gene was contained within a 2.5-kilobase (kb) DNA region, whereas alleles vlm-2+ through vlm-8+ were contained in a 12-kb region, representing at least three genes. Physical mapping experiments based on the isolation of cosmid clones showed that the two vlm loci were 50 to 70 kb apart. Southern hybridization experiments demonstrated that the vlm-2+ gene cluster was highly conserved among other valinomycin-producing Streptomyces strains, whereas the vlm-1+ gene was ubiquitous among Streptomyces species tested. Increasing the copy number of the vlm-2+ gene cluster in S. levoris A-9 by the introduction of low-copy-number recombinant plasmids resulted in a concomitant increase in the level of valinomycin production.

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Selected References

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