The LuxR homolog ExpR, in combination with the Sin quorum sensing system, plays a central role in Sinorhizobium meliloti gene expression.

@article{Hoang2004TheLH,
  title={The LuxR homolog ExpR, in combination with the Sin quorum sensing system, plays a central role in Sinorhizobium meliloti gene expression.},
  author={Hanh H. Hoang and Anke Becker and Juan E.G. Gonz{\'a}lez},
  journal={Journal of bacteriology},
  year={2004},
  volume={186 16},
  pages={5460-72}
}
Quorum sensing, a population density-dependent mechanism for bacterial communication and gene regulation, plays a crucial role in the symbiosis between alfalfa and its symbiont Sinorhizobium meliloti. The Sin system, one of three quorum sensing systems present in S. meliloti, controls the production of the symbiotically active exopolysaccharide EPS II. Based on DNA microarray data, the Sin system also seems to regulate a multitude of S. meliloti genes, including genes that participate in low… CONTINUE READING

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