Proton and calcium pumping P-type ATPases and their regulation of plant responses to the environment

Plant plasma membrane H+-ATPases and Ca2+-ATPases maintain low cytoplasmic concentrations of H+ and Ca2+, respectively, and are essential for plant growth and development. These low concentrations allow plasma membrane H+-ATPases to function as electrogenic voltage stats, and Ca2+-ATPases as "o...

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Veröffentlicht in:Plant physiology (Bethesda) Jg. 187; H. 4; S. 1856
Hauptverfasser: Fuglsang, Anja T, Palmgren, Michael
Format: Journal Article
Sprache:Englisch
Veröffentlicht: United States 04.12.2021
Schlagworte:
Adaptation, Physiological - drug effects
Calcium - metabolism
Calcium-Transporting ATPases - metabolism
Cell Membrane - metabolism
Ion Pumps - metabolism
Plant Physiological Phenomena - drug effects
Protein Transport - drug effects
Proton-Translocating ATPases - metabolism
Signal Transduction - drug effects
ISSN:1532-2548, 1532-2548
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Zusammenfassung:Plant plasma membrane H+-ATPases and Ca2+-ATPases maintain low cytoplasmic concentrations of H+ and Ca2+, respectively, and are essential for plant growth and development. These low concentrations allow plasma membrane H+-ATPases to function as electrogenic voltage stats, and Ca2+-ATPases as "off" mechanisms in Ca2+-based signal transduction. Although these pumps are autoregulated by cytoplasmic concentrations of H+ and Ca2+, respectively, they are also subject to exquisite regulation in response to biotic and abiotic events in the environment. A common paradigm for both types of pumps is the presence of terminal regulatory (R) domains that function as autoinhibitors that can be neutralized by multiple means, including phosphorylation. A picture is emerging in which some of the phosphosites in these R domains appear to be highly, nearly constantly phosphorylated, whereas others seem to be subject to dynamic phosphorylation. Thus, some sites might function as major switches, whereas others might simply reduce activity. Here, we provide an overview of the relevant transport systems and discuss recent advances that address their relation to external stimuli and physiological adaptations.
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ISSN:1532-2548
1532-2548
DOI:10.1093/plphys/kiab330