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Alex Costa1, Francesca Resentini2, Stefano Buratti2

  • 1Department of Biosciences, University of Milan, via Celoria 26, 20133 Milano, Italy; Institute of Biophysics, National Research Council of Italy (CNR), 20133 Milano, Italy.

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Plant calcium ATPases (ACAs and ECAs) regulate cellular calcium levels. This review details their biochemical properties and physiological roles in shaping calcium dynamics.

Keywords:
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Area of Science:

  • Plant molecular biology
  • Cellular physiology
  • Biochemistry

Background:

  • Calcium (Ca2+)-ATPases are essential ATP-dependent enzymes that maintain low cytosolic Ca2+ concentrations, preventing cellular damage.
  • In plants, two main types exist: Type IIB autoinhibited Ca2+-ATPases (ACAs) found in plasma membranes and endomembranes, and Type IIA ER-type Ca2+-ATPases (ECAs) primarily in ER and Golgi.
  • ACA activity is Ca2+-dependent, while ECAs are active at resting Ca2+ levels.

Approach:

  • This review synthesizes current knowledge on plant Ca2+-ATPases.
  • It highlights key biochemical characteristics of Type IIB (ACAs) and Type IIA (ECAs) pumps.
  • The review discusses their involvement in cellular Ca2+ dynamics in response to various stimuli.

Key Points:

  • ACAs and ECAs differ in localization, regulation, and basal activity.
  • ACAs are crucial for Ca2+ extrusion and signaling, regulated by Ca2+ itself.
  • ECAs maintain Ca2+ homeostasis within the ER and Golgi apparatus.

Conclusions:

  • Understanding the distinct roles of ACAs and ECAs is vital for comprehending plant Ca2+ signaling.
  • Recent research increasingly focuses on the physiological functions of these pumps beyond their biochemical characterization.
  • This review provides a comprehensive overview of their biochemical properties and their impact on cellular Ca2+ dynamics.