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CDK5R1 activator of cyclin-dependent kinase 5 (CDK5). Required for proper development of the central nervous system. The p35 form of this protein is cleaved by calpain, generating a p25 form, resulting in the prolonged activation and relocalization of the CDK5 from the cell periphery to nuclear and perinuclear regions. The p25 form accumulates in the brain neurons of patients with Alzheimer's disease, leading to aberrantly phosphorylated forms of the microtubule-associated protein tau, which contributes to Alzheimer's disease. Note: This description may include information from UniProtKB.
Protein type: Protein kinase, regulatory subunit
Chromosomal Location of Human Ortholog: 17q11.2
Cellular Component: axon; cell soma; contractile fiber; cytoplasm; cytosol; dendrite; dendritic spine; growth cone; intracellular membrane-bound organelle; membrane; neuromuscular junction; nucleoplasm; nucleus; perinuclear region of cytoplasm; plasma membrane; postsynaptic density
Molecular Function: cadherin binding; calcium ion binding; kinase activity; protein binding; protein kinase activity; protein kinase binding; protein serine/threonine kinase activator activity
Biological Process: acetylcholine receptor signaling, muscarinic pathway; axon guidance; axonal fasciculation; brain development; cell proliferation; ephrin receptor signaling pathway; ionotropic glutamate receptor signaling pathway; negative regulation of transcription, DNA-dependent; neurite development; neuron adhesion; neuron differentiation; neuron migration; peptidyl-serine phosphorylation; peptidyl-threonine phosphorylation; positive regulation of neuron apoptosis; regulation of cyclin-dependent protein kinase activity
Reference #:  Q15078 (UniProtKB)
Alt. Names/Synonyms: CD5R1; CDK5 activator 1; CDK5P35; CDK5R; CDK5R1; Cyclin-dependent kinase 5 activator 1; Cyclin-dependent kinase 5 activator 1, p25; Cyclin-dependent kinase 5 activator 1, p35; Cyclin-dependent kinase 5 regulatory subunit 1; cyclin-dependent kinase 5, regulatory subunit 1; cyclin-dependent kinase 5, regulatory subunit 1 (p35); MGC33831; NCK5A; neuronal CDK5 activator; p23; p25; p35; p35nck5a; regulatory partner for CDK5 kinase; Tau protein kinase II 23 kDa subunit; tau protein kinase II 23kDa subunit; TPKII regulatory subunit
Gene Symbols: CDK5R1
Molecular weight: 34,060 Da
Basal Isoelectric point: 9.44  Predict pI for various phosphorylation states
CST Pathways:  Alzheimer's Disease
Protein-Specific Antibodies or siRNAs from Cell Signaling Technology® Total Proteins
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