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Regulation of the swarming inhibitor disA in Proteus mirabilis
Bree A Szostek1, Philip N Rather
1Department of Microbiology and Immunology, Emory University, Atlanta, GA, USA.
Abstract:
The disA gene encodes a putative amino acid decarboxylase that inhibits swarming in Proteus mirabilis. 5' rapid amplification of cDNA ends (RACE) and deletion analysis were used to identify the disA promoter. The use of a disA-lacZ fusion indicated that FlhD(4)C(2), the class I flagellar master regulator, did not have a role in disA regulation. The putative product of DisA, phenethylamine, was able to inhibit disA expression, indicating that a negative regulatory feedback loop was present. Transposon mutagenesis was used to identify regulators of disA and revealed that umoB (igaA) was a negative regulator of disA. Our data demonstrate that the regulation of disA by UmoB is mediated through the Rcs phosphorelay.
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