2019 ; Vol.29-7: 1144~1154
|Author||Byeollee Kim, So-Ra Han, Janardan Lamichhane, Hyun Park, Tae-Jin Oh|
|Place of duty||Department of Life Science and Biochemical Engineering, SunMoon University, Asan, Korea|
|Title||Draft genome analysis of antimicrobial Streptomyces isolated from Himalayan lichen|
J. Microbiol. Biotechnol.2019 ;
|Abstract||There have been several studies regarding lichen-associated bacteria obtained from diverse environments. Our screening process identified 49 bacterial species in two lichens from the Himalayas: 17 species of Actinobacteria, 19 species of Firmicutes, and 13 species of Proteobacteria. We discovered five types of strong antimicrobial agent-producing bacteria. Although some strains exhibited weak antimicrobial activity, NP088, NP131, NP132, NP134, and NP160 exhibited strong antimicrobial activity against all multidrug-resistant strains. Polyketide synthase (PKS) fingerprinting revealed results for 69 of 148 strains; these had similar genes, such as fatty acid-related PKS, adenylation domain genes, PfaA, and PksD. Although the association between antimicrobial activity and the PKS fingerprinting results is poorly resolved, NP160 had six types of PKS fingerprinting genes, as well as strong antimicrobial activity. Therefore, we sequenced the draft genome of strain NP160, and predicted its secondary metabolism using antiSMASH version 4.2. NP160 had 46 clusters and was predicted to produce similar secondary metabolites with similarities of 5–100%. Although NP160 had 100% similarity with the alkylresorcinol biosynthetic gene cluster, our results showed low similarity with existing members of this biosynthetic gene cluster, and most have not yet been revealed. In conclusion, we expect that lichen-associated bacteria from the Himalayas can produce new secondary metabolites, and we found several secondary metabolite-related biosynthetic gene clusters to support this hypothesis.|
|Key_word||Antimicrobial activity, draft genome sequencing, fingerprinting, Himalayan lichen-associated bacteria, polyketide synthase, secondary metabolites|
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