Tyrosine phosphatase TpbA of pseudomonas aeruginosa controls extracellular DNA via cyclic diguanylic acid concentrations

Akihiro Ueda, Thomas K. Wood

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Inactivating the tyrosine phosphatase TpbA of Pseudomonas aeruginosa PA14 induces biofilm formation by 150-fold via increased production of the second messenger cyclic diguanylic acid (c-di-GMP). Here, we show the tpbA mutation reduces extracellular DNA (eDNA) and that increased expression of tpbA increases eDNA; hence, eDNA is inversely proportional to c-di-GMP concentrations. Mutations in diguanylate cyclases PA0169, PA4959 and PA5487 and phosphodiesterase PA4781 corroborate this trend. The tpbA mutation also decreases cell lysis while overexpression of tpbA increases cell lysis. To further link c-di-GMP concentrations and eDNA, the gene encoding phosphodiesterase PA2133 was overexpressed which increased eDNA and decreased biofilm formation by decreasing c-di-GMP. Furthermore, the effect of the tpbB mutation along with the tpbA mutation was examined because loss of TpbB restored the phenotypes controlled by enhanced c-di-GMP in the tpbA mutant. The tpbA tpbB double mutations restored eDNA to that of the PA14 wild-type level. These findings suggest that c-di-GMP, rather than TpbA, controls eDNA. Hence, TpbA acts as a positive regulator of eDNA and cell lysis by reducing c-di-GMP concentrations.

Original languageEnglish (US)
Pages (from-to)449-455
Number of pages7
JournalEnvironmental Microbiology Reports
Volume2
Issue number3
DOIs
StatePublished - Jun 2010

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Agricultural and Biological Sciences (miscellaneous)

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