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Sensor domains of two-component regulatory systems Cheung J; Hendrickson WACurr Opin Microbiol 2010[Apr]; 13 (2): 116-23Two-component systems regulate crucial cellular processes in microorganisms, and each comprises a homodimeric histidine kinase receptor and a cytoplasmic response regulator. Histidine kinases, often membrane associated, detect environmental input at sensor domains and propagate resulting signals to catalytic cytoplasmic transmitter domains. Recent studies on the great diversity of sensor domains reveal patterns of domain organization and biochemical properties that provide insight into mechanisms of signaling. Despite the enormous sequence variability found within sensor input domains, they fall into a relatively small number of discrete structural classes. Subtle rearrangements along a structurally labile dimer interface, in the form of possible sliding or rotational motions, are propagated from the sensor domain to the transmitter domain to modulate activity of the receptor.|*Catalytic Domain[MESH]|*Gene Expression Regulation, Bacterial[MESH]|*Signal Transduction[MESH]|Bacteria/chemistry/enzymology/*metabolism[MESH]|Bacterial Proteins/*chemistry/genetics/metabolism[MESH]|Histidine Kinase[MESH]|Models, Molecular[MESH]|Protein Kinases/*chemistry/genetics/metabolism[MESH] |