A novel function of Streptomyces integration host factor (sIHF) in the control of antibiotic production and sporulation in Streptomyces coelicolor

Yung Hun Yang, Eunjung Song, Joost Willemse, Sung Hee Park, Woo Seong Kim, Eun Jung Kim, Bo Rahm Lee, Ji Nu Kim, Gilles P. Van Wezel, Byung Gee Kim

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20 Scopus citations


Bacterial integration host factors (IHFs) play important roles in site-specific recombination, DNA replication, transcription, genome organization and bacterial pathogenesis. In Streptomyces coelicolor, there are three putative IHFs: SCO1480, SCO2950 and SCO5556. SCO1480 or Streptomyces IHF (sIHF) was previously identified as a transcription factor that binds to the promoter region of redD, the pathway-specific regulatory gene for the undecylprodigiosin biosynthetic gene cluster. Here we show that production of the pigmented antibiotics actinorhodin and undecylprodigiosin is strongly enhanced in sihf null mutants, while sporulation was strongly inhibited, with an on average 25% increase in spore size. Furthermore, the sihf mutant spores showed strongly reduced viability, with high sensitivity to heat and live/dead staining revealing a high proportion of empty spores, while enhanced expression of sIHF increased viability. This suggests a major role for sIHF in controlling viability, perhaps via the control of DNA replication and/or segregation. Proteomic analysis of the sihf null mutant identified several differentially expressed transcriptional regulators, indicating that sIHF may have an extensive response regulon. These data surprisingly reveal that a basic architectural element conserved in many actinobacteria such as mycobacteria, corynebacteria, streptomycetes and rhodococci may act as a global regulator of secondary metabolism and cell development.

Original languageEnglish
Pages (from-to)479-492
Number of pages14
JournalAntonie van Leeuwenhoek, International Journal of General and Molecular Microbiology
Issue number3
StatePublished - Mar 2012

Bibliographical note

Funding Information:
Acknowledgments This work was supported by WCU (World Class University) program (R322009000102130), NRL (National Research Lab) program (20090083035), and Basic Science Research Program (2010-0009942) through the National Research Foundation (NRF) grant funded by the Korean government (MEST), and by a VICI grant from the Dutch applied research council (STW) to GPvW.


  • Chromosome segregation
  • DNA replication
  • Development
  • HU
  • IHF
  • Nucleoid


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