Identification of Salmonella enterica serovar Typhimurium genes associated with growth suppression in stationary-phase nutrient broth cultures and in the chicken intestine

被引:23
作者
Rychlik, I
Martin, G
Methner, U
Lovell, M
Cardova, L
Sebkova, A
Sevcik, M
Damborsky, J
Barrow, PA [1 ]
机构
[1] AFRC, Inst Anim Hlth, Compton Lab, Newbury RG20 7NN, Berks, England
[2] Vet Res Inst, CS-62132 Brno, Czech Republic
[3] Fed Inst Consumer Hlth Protect & Vet Med, D-07745 Jena, Germany
[4] Masaryk Univ, Natl Ctr Biomol Res, CS-61137 Brno, Czech Republic
关键词
Salmonella enterica sv; Typhimurium; growth inhibition; quorum-sensing system; stationary phase; yhjH;
D O I
10.1007/s00203-002-0458-7
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Over 2,800 Tn5 insertion mutants of Salmonella enterica sv. Typhimurium were screened for the loss of ability to suppress the multiplication of a spectinomycin-resistant (SpC(r)) but otherwise isogenic S. enterica sv. Typhimurium strain, when the Spc(r) mutant was added to 24-h LB broth cultures of the mutants. Selected "growth nonsuppressive" (GNS) mutants were defective in respiration (insertions in arcA and fnr), amino acid biosynthesis (aroA and aroD), nutrient uptake and its regulation (tdcC and crp), and chemotaxis (fliD). In the last GNS mutant, the transposon inactivated yhjH, an ORF with unknown function which shows sequence similarity to di-guanylate cyclase and to novel two-component signal transduction proteins. In newly hatched chickens, all of the mutants, with the exception of the fliD mutant, were also unable to suppress colonization of the alimentary tract by the parent strain inoculated 1 day later. Defined mutations in luxS or sdiA, genes which contribute to quorum sensing in S. enterica sv. Typhimurium, had no effect on the stationary-phase growth suppression. Analysis of a transcriptional fusion construct indicated that yhjH was moderately expressed in the exponential phase of growth and up-regulated upon entry into stationary phase. Expression of yhjH was also considerably suppressed by the addition of supernatant from a 24-h stationary-phase S. enterica sv. Typhimurium culture, suggesting that the gene belongs to a new sensing and signaling regulatory pathway in S. enterica sv. Typhimurium.
引用
收藏
页码:411 / 420
页数:10
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