Identification of antifungal niphimycin from Streptomyces sp. KP6107 by screening based on adenylate kinase assay

Hye Yoon Kim, Jeong Do Kim, Jin Sung Hong, Jong Hyun Ham, Beom Seok Kim

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Microbial culture extracts are used for natural product screening to find antifungal lead compounds. A microbial culture extract library was constructed using 343 actinomycete isolates to examine the value of the adenylate kinase (AK) assay for screening to identify antifungal metabolites that disrupt cell integrity in plant pathogenic fungi. A culture extract of Streptomyces sp. strain KP6107 lysed cells of Fusarium oxysporum f.sp. lycopersici which resulted in high AK activity. The active ingredient N-1 was purified from the culture extract using various chromatographic procedures and identified to be the guanidyl-polyol macrolide antibiotic, niphimycin, which is a potent fungal cell membrane disruptor. Niphimycin showed broad-spectrum antifungal activity against Alternaria mali, Aspergillus oryzae, Colletotrichum coccodes, Colletotrichum gloeosporioides, Cercospora canescens, Cylindrocarpon destructans, F. oxysporum f.sp. cucumerinum, F. oxysporum f.sp. lycopersici, and Rhizoctonia solani at concentrations of 8-64μgml-1. Anthracnose development in pepper plants was completely inhibited by treatment with 50μgml-1 niphimycin, which was as effective as chlorothalonil. These results show that the AK assay is an efficient and selective tool in screening for cell membrane/wall disruptors of plant pathogenic fungi.

Original languageEnglish
Pages (from-to)581-589
Number of pages9
JournalJournal of Basic Microbiology
Volume53
Issue number7
DOIs
Publication statusPublished - 2013 Jul 1

Keywords

  • Adenylate kinase assay
  • Guanidyl-polyol macrolide
  • Niphimycin
  • Plant disease control
  • Streptomyces

ASJC Scopus subject areas

  • Applied Microbiology and Biotechnology

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