Calcium signaling

Calcium signaling is the use of calcium ions (Ca²⁺) to communicate and drive intracellular processes often as a step in signal transduction. Ca²⁺ is important for cellular signalling, for once it enters the cytosol of the cytoplasm it exerts allosteric regulatory effects on many enzymes and proteins. Ca²⁺ can act in signal transduction resulting from activation of ion channels or as a second messenger caused by indirect signal transduction pathways such as G protein-coupled receptors.