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Hygrolansamycins A-D, O-Heterocyclic Macrolides from Streptomyces sp. KCB17JA11

  • Jang, Jun-Pil (Chemical Biology Research Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Lee, Byeongsan (Chemical Biology Research Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Heo, Kyung Taek (Chemical Biology Research Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Oh, Tae Hoon (Chemical Biology Research Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Lee, Hyeok-Won (Biotechnology Process Engineering Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Ko, Sung-Kyun (Chemical Biology Research Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Hwang, Bang Yeon (College of Pharmacy, Chungbuk National University) ;
  • Jang, Jae-Hyuk (Chemical Biology Research Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Hong, Young-Soo (Chemical Biology Research Center, Korea Research Institute of Bioscience and Biotechnology)
  • Received : 2022.06.20
  • Accepted : 2022.09.01
  • Published : 2022.10.28

Abstract

Six ansamycin derivatives were isolated from the culture broth of Streptomyces sp. KCB17JA11, including four new hygrolansamycins A-D (1-4) and known congeners divergolide O (5) and hygrocin C (6). Compounds 1-5 featured an unusual six-membered O-heterocyclic moiety. The isolation workflow was guided by a Molecular Networking-based dereplication strategy. The structures of 1-4 were elucidated using NMR and HRESIMS experiments, and the absolute configuration was established by the Mosher's method. Compound 2 exhibited mild cytotoxicity against five cancer cell lines with IC50 values ranging from 24.60 ± 3.37 µM to 49.93 ± 4.52 µM.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant (2021M3H9A103743912), the KRIBB Research Initiative Program (KGM5292221 and KGM1222211) funded by the Ministry of Science ICT (MSIT) and the Basic Science Research Program (2021R1I1A204970412 and 2020R1I1A2068713) of the Ministry of Education of the Republic of Korea. We thank the Korea Basic Science Institute, Ochang, Korea, for providing the NMR (Bruker) and CD spectrum (Jasco).

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