Neurocalcin-delta (NCALD)

Neurocalcin-delta (NCALD) is a neuronal calcium sensor protein highly enriched in the brain, belonging to the visinin-like protein (VSNL) subfamily of EF-hand calcium-binding proteins[1][5][6]. It contains an N-terminal myristoylation signal and four EF-hand calcium binding loops, with the mature protein binding three calcium ions[5][6]. At low cytoplasmic calcium, NCALD is mostly cytosolic, but elevated calcium leads to a conformational change that exposes its myristoyl group, promoting membrane association, especially with mitochondria and the endoplasmic reticulum[1][5]. NCALD modulates Ca²⁺-sensitive signaling pathways, including regulating clathrin-mediated endocytosis, neurotransmitter release, axonal growth, and adult neurogenesis, potentially through interaction with proteins like MAP3K10 and the JNK pathway[1][5]. Reduction of NCALD confers protection in spinal muscular atrophy (SMA) models by ameliorating defects in spinal motor neurons—however, complete knockout in mice leads to impaired adult neurogenesis and hippocampal morphology, suggesting dosage sensitivity and a critical role in neuronal maturation[1]. NCALD is not a classical therapeutic target such as a receptor or enzyme; it is a regulatory calcium sensor, and no known drugs directly target NCALD or its pathway in clinical use[5][6]. Mutations or abnormal expression of NCALD are associated with neurodegenerative disease risk, particularly in SMA. There is no evidence it is routinely used as a biomarker or that it presents direct therapeutic safety issues, but disrupting its function in adults can impair neurogenesis[1][6].

Other names

neurocalcin deltaNCALDneurocalcin-deltaneurocalcinvisinin-like protein 2 (VILIP2)