Pentaene macrolides AB023a and takanawaene C produced by Streptomyces xanthocidicus strain S3 for controlling pepper anthracnose

Byeong Jun Jeon, Ji Eun Kang, Jeong Do Kim, Beom Seok Kim

Research output: Contribution to journalArticlepeer-review


A natural product library consisting of the culture extracts of 814 actinomycete strains was screened for antifungal compounds that disrupt the cell integrity of plant pathogenic fungi using an adenylate kinase (AK) assay system. The culture extract of Streptomyces xanthocidicus strain S3 exhibited high AK activity against various plant pathogens. The active ingredients, AT-1 and AT-2, were isolated from the culture extract using a series of chromatographic procedures. Based on MS, UV, and NMR spectrometric analyses, the structures of AT-1 and AT-2 were determined as the pentaene macrolides, AB023a and takanawaene C. AB023a and takanawaene C displayed broad-spectrum antifungal activity against Aspergillus oryzae, Botrytis cinerea, Colletotrichum coccodes, C. gloeosporioides, C. orbiculare, Cylindrocarpon destructans, and Fusarium oxysporum f. sp. lycopersici, showing minimum inhibitory concentrations of 1–32 μg/mL. Treatment of AB023a and takanawaene C successfully inhibited anthracnose development on pepper plants in a concentration-dependent manner without phytotoxicity. The disease control efficacy of both compounds was comparable to that of the commercial fungicide chlorothalonil. Collectively, these results suggest that the polyene macrolides produced by S. xanthocidicus strain S3 can be used as natural fungicides for plant disease control.

Original languageEnglish
Article number50
JournalApplied Biological Chemistry
Issue number1
Publication statusPublished - 2023 Dec

Bibliographical note

Publisher Copyright:
© 2023, The Korean Society for Applied Biological Chemistry.


  • Colletotrichum coccodes
  • Pentaene macrolide
  • Pepper anthracnose
  • Plant disease control agent
  • Streptomyces xanthocidicus

ASJC Scopus subject areas

  • General Biochemistry,Genetics and Molecular Biology
  • Organic Chemistry


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