d-Serine utilization contributes to P

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d-Serine utilization contributes to P d-Serine utilization contributes to P. mirabilis fitness in a murine model of CAUTI. Proteus mirabilis strain HI4320 (WT) and the dsdA mutant were cultured in LB broth overnight, washed once in PBS, and adjusted to 2 × 106 CFU/ml. d-Serine utilization contributes to P. mirabilis fitness in a murine model of CAUTI. Proteus mirabilis strain HI4320 (WT) and the dsdA mutant were cultured in LB broth overnight, washed once in PBS, and adjusted to 2 × 106 CFU/ml. (A) CBA/J mice were transurethrally inoculated with 50 µl of either WT (n = 10) or dsdA (n = 11) strains at 1 × 105 CFU, and a 4-mm segment of silicone catheter tubing was advanced into the bladder during inoculation. Mice were euthanized 96 h postinoculation (hpi), and bacterial burden was determined in the urine, bladders, kidneys, and spleens. Each symbol represents the log10 CFU per milliliter of urine or gram of tissue from an individual mouse, gray bars represent the medians, and the dashed line indicates the limit of detection. *, P < 0.05 by nonparametric Mann-Whitney test. (B and C) CBA/J mice (n = 11) were inoculated as described above with a 1:1 mixture of WT and dsdA strains to determine fitness during cochallenge. (B) Each symbol represents the log10 CFU per milliliter of urine or gram of tissue from an individual mouse, with the WT and dsdA CFU connected by a black line. Gray bars represent the means, and the dashed line indicates the limit of detection. (C) A competitive index was calculated as described above. Each symbol represents the log10 CI for an individual mouse, error bars represent the medians and the dashed line indicates log10 CI = 0 (the expected value if the ratio of mutant/WT is 1:1). *, P < 0.05, **, P < 0.01 by Wilcoxon signed-rank test. Aimee L. Brauer et al. mSphere 2019; doi:10.1128/mSphere.00020-19