期刊
PLANT JOURNAL
卷 86, 期 1, 页码 50-61出版社
WILEY
DOI: 10.1111/tpj.13151
关键词
Arabidopsis thaliana; heterotrimeric G-proteins; regulator of G-protein signaling; RGS1; phospholipase D alpha 1; protein-protein interaction; GAP activity; abscisic acid; G-protein cycle regulation
资金
- NIFA/AFRI [2015-67013-22964]
- NSF [MCB-1157944]
- Div Of Molecular and Cellular Bioscience
- Direct For Biological Sciences [1157944] Funding Source: National Science Foundation
Heterotrimeric G-proteins comprised of G alpha, G beta and G gamma subunits are important signal transducers in all eukaryotes. In plants, G-proteins affect multiple biotic and abiotic stress responses, as well as many developmental processes, even though their repertoire is significantly limited compared with that in metazoan systems. One canonical and three extra-large G alpha, 1 G beta and 3 G gamma proteins represent the heterotrimeric G-protein complex in Arabidopsis, and a single regulatory protein, RGS1, is one of the few known biochemical regulators of this signaling complex. This quantitative disparity between the number of signaling components and the range of processes they influence is rather intriguing. We now present evidence that the phospholipase D alpha 1 protein is a key component and modulator of the G-protein complex in affecting a subset of signaling pathways. We also show that the same G-protein subunits and their modulators exhibit distinct physiological and genetic interactions depending on specific signaling and developmental pathways. Such developmental plasticity and interaction specificity likely compensates for the lack of multiplicity of individual subunits, and helps to fine tune the plants' responses to constantly changing environments.
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