Turgor pressure is a cellular parameter, important for a range of physiological processes in plants, like cell elongation, gas exchange and gravitropic/phototropic bending. Regulation of turgor pressure involves ion and water transport at the expense of metabolic energy (ATP). The primary pump in the plasma membrane (the H+-ATPase) is a key player in turgor regulation since it provides the driving force for ion uptake, followed by water influx through osmosis. Using the phytotoxin fusicoccin (a well-known activator of the ATPase) as a tool, 14-3-3 proteins were identified as regulators of the H+-ATPase. Since fusicoccin has a dramatic effect on K+ accumulation and cellular respiration as well, we studied whether 14-3-3 proteins play a role in the regulation of the mitochondrial F0F1-ATP synthase and ion channels in the vacuolar and plasma membranes. Besides the plasma membrane H+-ATPase, we have identified thus far at least four other transport proteins that are regulated by 14-3-3 proteins. The mechanism of regulation will be described and the possibility that 14-3-3 proteins act as coordinators of ion transporters with varied but interdependent functions will be discussed.
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Conference Article|
August 01 2002
Plant 14-3-3 proteins assist ion channels and pumps
A. H. de Boer
A. H. de Boer
1
1Vrije Universiteit, Faculty of Earth and Life Sciences, Department of Developmental Genetics, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands
1e-mail ahdeboer@bio.vu.nl
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Publisher: Portland Press Ltd
Received:
March 14 2002
Online ISSN: 1470-8752
Print ISSN: 0300-5127
© 2002 Biochemical Society
2002
Biochem Soc Trans (2002) 30 (4): 416–421.
Article history
Received:
March 14 2002
Citation
A. H. de Boer; Plant 14-3-3 proteins assist ion channels and pumps. Biochem Soc Trans 1 August 2002; 30 (4): 416–421. doi: https://doi.org/10.1042/bst0300416
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