Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 105, Issue 48, Pages 18947-18952Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0808215105
Keywords
MvaT; MvaU; Pseudomonas aeruginosa
Categories
Funding
- National Institutes of Health [AI069007, AI057754]
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The histone-like nucleoid structuring protein, H-NS, is a prominent global regulator of gene expression. Many Gram-negative bacteria contain multiple members of the H-NS family of proteins. Thus, a key question is whether H-NS family members have overlapping or distinct functions. To address this question we performed genome-wide location analyses with MvaT and MvaU, the two H-NS family members present in Pseudomonas aeruginosa. We show that MvaT and MvaU bind the same chromosomal regions, coregulating the expression of approximate to 350 target genes. We show further that like H-NS in enteric bacteria, which functions as a transcriptional silencer of foreign DNA by binding to AT-rich elements, MvaT and MvaU bind preferentially to AT-rich regions of the chromosome. Our findings establish that H-NS paralogs can function coordinately to regulate expression of the same set of target genes, and suggest that MvaT and MvaU are involved in silencing foreign DNA elements in P. aeruginosa.
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