Two-component systems in plant signal transduction.
In plants, two-component systems play important roles in signal transduction in response to environmental stimuli and growth regulators. Genetic and biochemical analyses indicate that sensory hybrid-type histidine kinases, ETR1 and its homologs, function as ethylene receptors and negative regulators in ethylene signaling. Two other hybrid-type histidine kinases, CKI1 and ATHK1, are implicated in cytokinin signaling and osmosensing processes, respectively. A data base search of Arabidopsis ESTs and genome sequences has identified many homologous genes encoding two-component regulators. We discuss the possible origins and functions of these two-component systems in plants.
Urao
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Biological Resources Division, Japan International Research Center for Agricultural Science, Ministry of Agriculture, Forestry and Fisheries, 1-2 Ohwashi, Tsukuba, Ibaraki 305, Japan.
Yamaguchi-Shinozaki
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Shinozaki
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D017360:Arabidopsis / Q000201:enzymology / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D015398:Signal Transduction