Calcium-binding motif

Calcium-binding motifs are conserved structural elements within proteins that facilitate the binding of calcium ions (Ca2+), enabling proteins to function as calcium sensors, buffers, or transporters. The most prominent of these is the EF-hand motif, a helix-loop-helix structure found in proteins like calmodulin and troponin C, which undergoes a conformational change upon calcium binding to regulate downstream signaling. Other significant motifs include the C2 domain, which mediates membrane docking, and the annexin fold. While these motifs are not typically considered individual therapeutic targets, the specific proteins that contain them are critical in various diseases, including cardiovascular disorders, neurodegeneration, and cancer. Pharmacological intervention often involves small molecules that either block the calcium-binding site or stabilize specific conformational states to modulate protein activity. However, the ubiquity of these motifs across hundreds of human proteins poses a significant challenge for achieving drug specificity and avoiding off-target effects.

Other names

EF-handC2 domainAnnexin foldEGF-like domainRTX motifCalcium-binding domainCa2+-binding motif

Modulation of calcium-dependent conformational changes and protein-protein interactions