A novel function of Streptomyces integration host factor (sIHF) in the control of antibiotic production and sporulation in Streptomyces coelicolor.
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.
Department of Microbial Engineering, College of Engineering, Konkuk University, Seoul, Korea.
Yung-Hun
YH
Yang
Eunjung
E
Song
Joost
J
Willemse
Sung-Hee
SH
Park
Woo-Seong
WS
Kim
Eun-jung
EJ
Kim
Bo-Rahm
BR
Lee
Ji-Nu
JN
Kim
Gilles P
GP
van Wezel
Byung-Gee
BG
Kim
D000880:Anthraquinones / Q000378:metabolism; D001426:Bacterial Proteins / Q000096:biosynthesis / Q000235:genetics; D004269:DNA, Bacterial / Q000378:metabolism; D015180:Electrophoresis, Gel, Two-Dimensional; D004926:Escherichia coli; D017353:Gene Deletion; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D006358:Hot Temperature; D034982:Integration Host Factors / Q000235:genetics / Q000502:physiology*; D008854:Microscopy, Electron; D008856:Microscopy, Fluorescence; D011353:Prodigiosin / Q000031:analogs & derivatives / Q000096:biosynthesis / Q000378:metabolism; D040901:Proteomics; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D013171:Spores, Bacterial / Q000502:physiology / Q000648:ultrastructure; D013194:Staining and Labeling; D048372:Streptomyces coelicolor / Q000235:genetics / Q000378:metabolism* / Q000502:physiology; D000095622:Benzoisochromanequinones
D000880:Anthraquinones; D001426:Bacterial Proteins; D004269:DNA, Bacterial; D034982:Integration Host Factors; D011353:Prodigiosin; D011993:Recombinant Fusion Proteins; C047347:undecylprodigiosin; C013390:actinorhodin; D000095622:Benzoisochromanequinones