Histidine kinases in plants: cross talk between hormone and stress responses.
Two-component signaling pathways involve sensory histidine kinases (HK), histidine phosphotransfer proteins (HpT) and response regulators (RR). Recent advancements in genome sequencing projects for a number of plant species have established the TCS family to be multigenic one. In plants, HKs operate through the His-Asp phosphorelay and control many physiological and developmental processes throughout the lifecycle of plants. Despite the huge diversity reported for the structural features of the HKs, their functional redundancy has also been reported via mutant approach. Several sensory HKs having a CHASE domain, transmembrane domain(s), transmitter domain and receiver domain have been reported to be involved in cytokinin and ethylene signaling. On the other hand, there are also increasing evidences for some of the sensory HKs to be performing their role as osmosensor, clearly indicating toward a possible cross-talk between hormone and stress responsive cascades. In this review, we bring out the latest knowledge about the structure and functions of histidine kinases in cytokinin and ethylene signaling and their role(s) in development and the regulation of environmental stress responses.
Stress Physiology and Molecular Biology Laboratory, School of Life Sciences: Jawaharlal Nehru University, New Delhi, India.
Ramsong
R
Nongpiur
Praveen
P
Soni
Ratna
R
Karan
Sneh L
SL
Singla-Pareek
Ashwani
A
Pareek
D000071677:Histidine Kinase; D008954:Models, Biological; D010937:Plant Growth Regulators / Q000378:metabolism*; D010944:Plants / Q000201:enzymology* / Q000235:genetics; D011494:Protein Kinases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction; D013312:Stress, Physiological
D010937:Plant Growth Regulators; D011494:Protein Kinases; D000071677:Histidine Kinase