Generation and initial characterization of a collection of spontaneous Streptomyces albus J1074 mutants resistant to rifampicin

Aim. Streptomyces albus J1074 is one of the most popular streptomycete chassis for heterologous expression of natural product (NP) biosynthetic gene clusters (BGCs). There is keen interest in further improvement of the strain to provide increased yields of corresponding NPs. Introduction of certain types of antibiotic resistance mutations is a proven way to improve Streptomyces strains. For example, selection for increased resistance to rifampicin is known to lead to increased antibiotic activity. Here we used available lineages of antibiotic-resistant mutants of S. albus to raise rifampicin-resistant variants (Rifr) and to study their properties. Methods. Microbiological and molecular genetic approaches were combined to generate Rifr mutants and to study their properties. Results. By plating S. albus onto GYM agar supplemented with 10 mcg/mL of rifampicin, we isolated 85 stable Rifr colonies, whose resistance level was within 10-200 mcg/mL range. Sequencing revealed wide spectrum of missense mutations within rpoB gene. Bioassays demonstrated dramatically increased endogenous antibiotic activity of certain Rifr mutants. Conclusions. Selection for rifampicin resistance is a viable way to increase the yields of NPs in S. albus. Keywords: Streptomyces albus J1074, antibiotic resistance, rifampicin.

• Publication year

  2020

• Venue

  Faktori eksperimentalʹnoï evolûcìï organìzmìv

• Publication date

  2020-09-01

• Fields of study

  Not labeled

• Identifiers
  DOI 10.7124/feeo.v27.1316
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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