Dual specificity protein phosphatase TpbA

UniProtKB accession:  A0A0H2ZFK2

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UniProtKB description:  Phosphatase that regulates diverse phenotypes in P.aeruginosa via regulation of the concentration of cellular c-di-GMP (PubMed:19543378). Acts by dephosphorylating the membrane-anchored diguanylate cyclase TpbB at tyrosine and serine/threonine sites, leading to inactivation of TpbB and reduced c-di-GMP production (PubMed:19543378, PubMed:20946878). The reduced cellular c-di-GMP concentration leads to reduced adhesin expression, reduced extracellular polysaccharide (EPS) production, pellicule production, cell aggregation and biofilm formation, and enhanced swimming and swarming (PubMed:19543378). It affects colony morphology and controls rugose colony formation (PubMed:19543378, PubMed:20946878). TpbA also acts as a positive regulator of extracellular DNA (eDNA, a major component of the biofilm matrix) and cell lysis by reducing c-di-GMP concentrations (PubMed:23766119). In vitro shows phosphatase activity toward p-nitrophenyl phosphate (pNPP), tyrosine phosphopeptides and a threonine phosphopeptide (PubMed:19543378, PubMed:20946878). Does not have phosphodiesterases (PDE) activity, and cannot degrade c-di-GMP (PubMed:20946878).