Exploitation of potentially new antibiotics from mangrove actinobacteria in maowei sea by combination of multiple discovery strategies

Qin Pei Lu, Jing Jing Ye, Yong Mei Huang, Di Liu, Li Fang Liu, Kun Dong, Elizaveta A. Razumova, Ilya A. Osterman, Petr V. Sergiev, Olga A. Dontsova, Shu Han Jia, Da Lin Huang, Cheng Hang Sun

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    Rediscovery of known antibiotics from actinobacteria, especially Streptomyces, has become a bottleneck issue. Nowadays, more specific identification and dereplication could be acquired by a combination of modern analytic techniques with various databases. In this study, 261 actinobacterial strains were isolated from 8 mangrove soil samples by culture-dependent method. A total of 83 strains were selected to evaluate antibacterial activities and mechanisms by disc diffusion method and a unique double fluorescent protein reporter system (pDualrep2), respectively. Thirty-two strains exhibited antagonistic activity against at least one of the “ESKAPE” pathogens. Four Streptomyces strains (B475, B486, B353, and B98) showed strong inhibitory activity against Gram-positive bacteria and induced DNA damage SOS response. One Micromonospora strain (B704) exhibited inhibitory activity against several pathogens and induced attenuation-based translational inhibitors reporter. Seven members of quinoxaline-type antibiotics including quinomycin A, quinomycin monosulfoxide, and other five putative new analogues were found from the culture broth of strain B475 by a combination of anti-MRSA guide, HPTLC, HPLC-UV, and UPLC-UV-HRESIMS/MS analysis, Chemspider searching, and MS/MS-based molecular networking analysis. In conclusion, this study not only demonstrated that mangrove is a rich source of actinobacteria with the potentially new antibiotics but showed rapid dereplication of known antibiotics in the early stage can improve efficiency for the discovery of new antibiotics.

    Original languageEnglish
    Article number236
    JournalAntibiotics
    Volume8
    Issue number4
    DOIs
    Publication statusPublished - Dec 2019

    Keywords

    • Actinobacteria
    • Dereplication
    • Diversity
    • ESKAPE
    • GNPS
    • Mangrove
    • Maowei Sea
    • Quinomycins

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