CDK5/p25 Recombinant Protein

This gene encodes a proline-directed serine/threonine kinase that is a member of the cyclin-dependent kinase family of proteins. Unlike other members of the family, the protein encoded by this gene does not directly control cell cycle regulation. Instead the protein, which is predominantly expressed at high levels in mammalian postmitotic central nervous system neurons, functions in diverse processes such as synaptic plasticity and neuronal migration through phosphorylation of proteins required for cytoskeletal organization, endocytosis and exocytosis, and apoptosis. In humans, an allelic variant of the gene that results in undetectable levels of the protein has been associated with lethal autosomal recessive lissencephaly-7. Alternative splicing results in multiple transcript variants. [provided by RefSeq, May 2015]

CDK5: a protein kinase of the CDK family. Unlike other members of this family, it is not activated by cyclins but by p35 (CDK5R1) and p39. An important regulator of neuronal positioning during brain development. May also play a role in synaptogenesis and neurotransmission. Substrates include TAU, MAP2, NF-H and -M, Nudel, PDE6, beta-catenin, amphyphysin, dynamin I, synapsin 1, Munc-18, and NMDA receptor 2A. Plays a role in myogenesis, haematopoietic cell differentiation, spermatogenesis, insulin secretion, and lens differentiation. Implicated in the pathology of neurofibrillary tangles and formation of senile plaques, hallmarks of Alzheimer?s disease. Induces tau phosphorylation and aggregation and neurofibrillary tangle deposition and neurodegeneration in in vitro and in vivo animal models. Brain samples from Alzeimer?s pateints show elevated CDK5 activity.

Protein type: CDK family; CDK/CDK5 subfamily; CDK5 subfamily; CMGC group; Cell cycle regulation; EC 2.7.11.1; Kinase, protein; Protein kinase, CMGC; Protein kinase, Ser/Thr (non-receptor)

Chromosomal Location of Human Ortholog: 7q36.1

Cellular Component: axon; cell junction; cell soma; cytoplasm; cytosol; dendrite; growth cone; membrane; neuromuscular junction; nucleoplasm; nucleus; plasma membrane; postsynaptic density

Molecular Function: acetylcholine receptor activator activity; cyclin-dependent protein kinase activity; ErbB-2 class receptor binding; ErbB-3 class receptor binding; kinase activity; protein binding; protein kinase activity; protein serine/threonine kinase activity; tau-protein kinase activity

Biological Process: axon extension; cell proliferation; negative regulation of proteolysis; negative regulation of transcription, DNA-dependent; neurite development; neuron apoptosis; neuron differentiation; neuron migration; oligodendrocyte differentiation; peptidyl-serine phosphorylation; phosphorylation; positive regulation of neuron apoptosis; regulation of apoptosis; regulation of macroautophagy; regulation of synaptic plasticity; synaptic transmission; synaptic vesicle endocytosis; synaptic vesicle exocytosis; synaptogenesis

Disease: Lissencephaly 7 With Cerebellar Hypoplasia