Secretagogin, EF-hand calcium binding protein (SCGN)

Secretagogin (SCGN) is a **hexa-EF-hand calcium-binding protein** highly expressed in pancreatic islets, various brain regions, and the gastrointestinal tract. It acts as a **calcium sensor** protein, undergoing conformational change upon Ca2+ binding, which enables interaction with target proteins like SNAP-25, modulating regulated exocytosis in neurons and endocrine cells. Secretagogin is implicated in **insulin secretion**, **modulation of neuronal growth**, synapse function, and **stress hormone release**. Deficiency or dysregulation of secretagogin has been associated with **neurodevelopmental disorders** and altered **beta cell function** in diabetes. Structurally, it is closely related to other EF-hand proteins such as calbindin and calretinin, but its lower Ca2+ affinity and sensor-like dynamics distinguish its function in signaling rather than mere buffering. Secretagogin may serve as a cellular marker for certain neuroendocrine or neuronal populations and is under investigation as a **potential biomarker** rather than a current therapeutic drug target

Other names

SecretagoginSCGNSECRETDJ501N12.8SEGNCALBLcalbindin-likesetaginEF-hand calcium binding protein

Not applicable; currently, no drugs directly targeting secretagogin are described in the literature or clinical use.