Bacterial hybrid histidine kinases in plant-bacteria interactions.
Two-component signal transduction systems are essential for many bacteria to maintain homeostasis and adapt to environmental changes. Two-component signal transduction systems typically involve a membrane-bound histidine kinase that senses stimuli, autophosphorylates in the transmitter region and then transfers the phosphoryl group to the receiver domain of a cytoplasmic response regulator that mediates appropriate changes in bacterial physiology. Although usually found on distinct proteins, the transmitter and receiver modules are sometimes fused into a so-called hybrid histidine kinase (HyHK). Such structure results in multiple phosphate transfers that are believed to provide extra-fine-tuning mechanisms and more regulatory checkpoints than classical phosphotransfers. HyHK-based regulation may be crucial for finely tuning gene expression in a heterogeneous environment such as the rhizosphere, where intricate plant-bacteria interactions occur. In this review, we focus on roles fulfilled by bacterial HyHKs in plant-associated bacteria, providing recent findings on the mechanistic of their signalling properties. Recent insights into understanding additive regulatory properties fulfilled by the tethered receiver domain of HyHKs are also addressed.
Université de Lyon, Université Lyon 1, Ecologie Microbienne, CNRS UMR5557, INRA UMR1418, Villeurbanne, France.
Stéphanie
S
Borland
Université de Lyon, Université Lyon 1, Ecologie Microbienne, CNRS UMR5557, INRA UMR1418, Villeurbanne, France.
Claire
C
Prigent-Combaret
Université de Lyon, Université Lyon 1, Ecologie Microbienne, CNRS UMR5557, INRA UMR1418, Villeurbanne, France.
Florence
F
Wisniewski-Dyé
D001419:Bacteria / Q000201:enzymology* / Q000235:genetics; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D015964:Gene Expression Regulation, Bacterial; D000071677:Histidine Kinase / Q000235:genetics / Q000378:metabolism*; D010944:Plants / Q000382:microbiology*
D001426:Bacterial Proteins; D000071677:Histidine Kinase