genome-wide chromatin immunoprecipitation sequencing analysis shows that whib is a transcription factor that cocontrols its regulon with whia to initiate developmental cell division in streptomyces

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ID: 199551
2016
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Abstract
WhiB is the founding member of a family of proteins (the WhiB-like [Wbl] family) that carry a [4Fe-4S] iron-sulfur cluster and play key roles in diverse aspects of the biology of actinomycetes, including pathogenesis, antibiotic resistance, and the control of development. In Streptomyces, WhiB is essential for the process of developmentally controlled cell division that leads to sporulation. The biochemical function of Wbl proteins has been controversial; here, we set out to determine unambiguously if WhiB functions as a transcription factor using chromatin immunoprecipitation sequencing (ChIP-seq) in Streptomyces venezuelae. In the first demonstration of in vivo genome-wide Wbl binding, we showed that WhiB regulates the expression of key genes required for sporulation by binding upstream of ~240 transcription units. Strikingly, the WhiB regulon is identical to the previously characterized WhiA regulon, providing an explanation for the identical phenotypes of whiA and whiB mutants. Using ChIP-seq, we demonstrated that in vivo DNA binding by WhiA depends on WhiB and vice versa, showing that WhiA and WhiB function cooperatively to control expression of a common set of WhiAB target genes. Finally, we show that mutation of the cysteine residues that coordinate the [4Fe-4S] cluster in WhiB prevents DNA binding by both WhiB and WhiA in vivo.
Reference Key
bush2016mbiogenome-wide Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Matthew J. Bush;Govind Chandra;Maureen J. Bibb;Kim C. Findlay;Mark J. Buttner
Journal synlett
Year 2016
DOI
10.1128/mBio.00523-16
URL
http://mbio.asm.org/cgi/content/full/7/2/e00523-16
Keywords
Microbiology

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