Iminimycin A, the new iminium metabolite produced by Streptomyces griseus OS-3601

Takuji Nakashima*, Rei Miyano, Masato Iwatsuki, Tatsuya Shirahata, Toru Kimura, Yukihiro Asami, Yoshinori Kobayashi, Kazuro Shiomi, George A. Petersson, Yoko Takahashi, Satoshi Omura

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


A new natural product, designated iminimycin A, was isolated from the cultured broth of a streptomycin-producing microbial strain, Streptomyces griseus OS-3601, via a physicochemical screening method using HP-20, silica gel and ODS column chromatographies and subsequent preparative HPLC. Iminimycin A is an indolizidine alkaloid, containing of an unusual iminium group and a cyclopropane ring with a triene side chain. The absolute configuration of iminimycin A was elucidated by NMR studies and electronic circular dichroism analysis. Iminimycin A shows anti-bacterial activity against Bacillus subtilis, Kocuria rhizophila and Xanthomonas campestris pv. orizae, and cytotoxic activity against HeLa S3 and Jurkat cells with IC50 values of 43 and 36 μM, respectively.

Original languageEnglish
Pages (from-to)611-615
Number of pages5
JournalJournal of Antibiotics
Issue number8
Publication statusPublished - 2016 Aug 1
Externally publishedYes

ASJC Scopus subject areas

  • Pharmacology
  • Drug Discovery


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