Journal
NUCLEIC ACIDS RESEARCH
Volume 43, Issue 17, Pages 8268-8282Publisher
OXFORD UNIV PRESS
DOI: 10.1093/nar/gkv747
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Funding
- National Natural Science Foundation for Young Scientists of China [31000049]
- Natural Science Basis Research Plan in ShaanXi Province of China [2010JQ3008]
- Program for the academic backbone of excellent young of Northwest University [338050069]
- Project of Tianjin, China [13TXSYJC40100]
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AlgR is a key transcriptional regulator required for the expression of multiple virulence factors, including type IV pili and alginate in Pseudomonas aeruginosa. However, the regulon and molecular regulatory mechanism of AlgR have yet to be fully elucidated. Here, among 157 loci that were identified by a ChIP-seq assay, we characterized a gene, mucR, which encodes an enzyme that synthesizes the intracellular second messenger cyclic diguanylate (c-diGMP). A Delta algR strain produced lesser biofilm than did the wild-type strain, which is consistent with a phenotype controlled by c-di-GMP. AlgR positively regulates mucR via direct binding to its promoter. A Delta algR Delta mucR doublemutant produced lesser biofilm than did the single Delta algR mutant, demonstrating that c-di-GMP is a positive regulator of biofilm formation. AlgR controls the levels of c-di-GMP synthesis via direct regulation of mucR. In addition, the cognate sensor of AlgR, FimS/AlgZ, also plays an important role in P. aeruginosa virulence. Taken together, this study provides new insights into the AlgR regulon and reveals the involvement of c-di-GMP in the mechanism underlying AlgR regulation.
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