Regulation of organelle function

Calcium (Ca²⁺) is an important regulator of organelle function throughout the cell. In the endoplasmic reticulum (ER), luminal Ca²⁺ supports protein folding and quality control by helping the cell identify and respond to misfolded proteins. In mitochondria, Ca²⁺ regulates key metabolic enzymes that drive energy production, linking mitochondrial Ca²⁺ uptake to ATP generation. In lysosomes, Ca²⁺ release helps regulate autophagy and other lysosomal processes.

Transfer of Ca²⁺

Where does cellular Ca²⁺ come from, and how does it move between organelles? These questions are an active area of research in cell biology and neuroscience. The traditional model viewed Ca²⁺ primarily as entering the cell through channels in the plasma membrane, followed by sequestration into intracellular organelles. We now know that Ca²⁺ is also transferred directly between organelles through specialized contact sites and signaling pathways.

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