Journal
INFECTION AND IMMUNITY
Volume 71, Issue 2, Pages 1026-1030Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/IAI.71.2.1026-1030.2003
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Funding
- NIAID NIH HHS [F32 AI051078, AI23328, F32 AI51078] Funding Source: Medline
- NIDDK NIH HHS [R01 DK047920] Funding Source: Medline
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Proteus mirabilis, a cause of complicated urinary tract infection, produces urease, an essential virulence factor for this species. UreR, a member of the AraC/XylS family of transcriptional regulators, positively activates expression of the ure gene cluster in the presence of urea. To specifically evaluate the contribution of UreR to urease activity and virulence in the urinary tract, a ureR mutation was introduced into P. mirabilis H14320 by homologous recombination. The isogenic ureR::aphA mutant, deficient in UreR production, lacked measurable urease activity. Expression was not detected in the UreR-deficient strain by Western blotting with monoclonal antibodies raised against UreD. Urease activity and UreD expression were restored by complementation of the mutant strain with ureR expressed from a low-copy-number plasmid. Virulence was assessed by transurethral cochallenge of CBA mice with wild-type and mutant strains. The isogenic ureR::aphA mutant of H14320 was outcompeted in the urine (P = 0.004), bladder (P = 0.016), and kidneys (P less than or equal to 0.001) 7 days after inoculation. Thus, UreR is required for basal urease activity in the absence of urea, for induction of urease by urea, and for virulence of P. mirabilis in the urinary tract.
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