Ca2+‐storage organelles

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Abstract
Intracellular Ca2+-storage organelles are found in virtually all eukaryotic cells. They play an important role in the regulation of the cytosolic free Ca2+ concentration and, thereby, in the regulation of cellular activity. Ca2+-storage organelles consist, in the simplest model of a Ca2+ pump, of a Ca2+-storage protein and a Ca2+-release channel. The primary structure of these functionally important proteins of Ca2+-storage organelles is similar in different cell types and conserved through evolution. In contrast, their spatial arrangement and, thus, the architecture of Ca2+-storage organelles may vary dramatically from one cell type to another