a novel signaling network essential for regulating pseudomonas aeruginosa biofilm development一种新的信号调控网络必不可少的铜绿假单胞菌生物膜的发展.pdfVIP
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a novel signaling network essential for regulating pseudomonas aeruginosa biofilm development一种新的信号调控网络必不可少的铜绿假单胞菌生物膜的发展
A Novel Signaling Network Essential for Regulating
Pseudomonas aeruginosa Biofilm Development
Olga E. Petrova, Karin Sauer*
Department of Biological Sciences, Binghamton University, Binghamton, New York, United States of America
Abstract
The important human pathogen Pseudomonas aeruginosa has been linked to numerous biofilm-related chronic infections.
Here, we demonstrate that biofilm formation following the transition to the surface attached lifestyle is regulated by three
previously undescribed two-component systems: BfiSR (PA4196-4197) harboring an RpoD-like domain, an OmpR-like BfmSR
(PA4101-4102), and MifSR (PA5511-5512) belonging to the family of NtrC-like transcriptional regulators. These two-
component systems become sequentially phosphorylated during biofilm formation. Inactivation of bfiS, bfmR, and mifR
arrested biofilm formation at the transition to the irreversible attachment, maturation-1 and -2 stages, respectively, as
indicated by analyses of biofilm architecture, and protein and phosphoprotein patterns. Moreover, discontinuation of bfiS,
bfmR, and mifR expression in established biofilms resulted in the collapse of biofilms to an earlier developmental stage,
indicating a requirement for these regulatory systems for the development and maintenance of normal biofilm architecture.
Interestingly, inactivation did not affect planktonic growth, motility, polysaccharide production, or initial attachment.
Further, we demonstrate the interdependency of this two-component systems network with GacS (PA0928), which was
found to play a dual role in biofilm formation. This work describes a novel signal transduction network regulating
committed biofilm developmental steps following attachment, in which phosphorelays and two sigma factor-d
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