1887

Abstract

Transcriptional regulation mediates adaptation of pathogens to environmental stimuli and is important for host colonization. The genome sequence reveals a surprisingly small set of regulators, mostly of unknown function, suggesting an intricate regulatory network. Interestingly, lacks the homologues of ubiquitous regulators involved in stress response found in many other Gram-negative bacteria. Nonetheless, is predicted to encode the sole LysR-type regulator in the genome, and thus may be involved in major adaptation pathways. A mutant strain was constructed and found to be attenuated in its ability to colonize 1-day-old chicks. Complementation of the mutation restored the colonization ability to wild-type levels. The mutant strain was also outcompeted in a competitive colonization assay of the piglet intestine. Oxygraphy was carried out for what is believed to be the first time with the Oroboros Oxygraph-2k on and revealed a role for Cj1000 in controlling O consumption. Furthermore, microarray analysis of the mutant revealed both direct and indirect regulatory targets, including genes involved in energy metabolism and oxidative stress defences. These results highlight the importance of Cj1000 regulation in host colonization and in major physiological pathways.

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2013-06-01
2021-10-20
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