CDK4 Protein
Introduction <table class="infobox infobox-protein">Gene Symbol </td>Protein Name </td>Alternative Names </td>UniProt ID </td>Molecular Weight </td>Protein Family </td>Tissue Distribution </td>
Cdk4 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Overview ...
CDK4 Protein
Introduction <table class="infobox infobox-protein">Gene Symbol </td>Protein Name </td>Alternative Names </td>UniProt ID </td>Molecular Weight </td>Protein Family </td>Tissue Distribution </td>
Cdk4 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Overview CDK4 (Cyclin-Dependent Kinase 4) is a serine/threonine kinase that forms a complex with D-type cyclins to regulate cell cycle progression from G1 to S phase. CDK4 is essential for cell proliferation and is frequently dysregulated in cancer. In the nervous system, CDK4 plays important roles in neuronal development, cell cycle re-entry in neurodegeneration, and synaptic plasticity [@sherr1993][@matsushime1994].
Structure CDK4 has typical CDK structure:
Kinase domain — Serine/threonine kinase activityCyclin-binding domain — Binds D-type cyclins (CYCD1-3)TPX2 binding site — Regulatory interactionsThr172 phosphorylation site — Activation loopCDK4 activity requires:
Binding to D-type cyclins
Phosphorylation at Thr172 by CDK-activating kinase (CAK)
Removal of inhibitory phosphorylation [@russo1998]
Normal Function
Cell Cycle Regulation CDK4/Cyclin D complex:
G1 progression — Phosphorylates RB to release E2FGene expression — Enables S-phase gene transcriptionCellular commitment — Commit cells to proliferationRestriction point — Controls G1/S transitionNeuronal Functions In [neurons](/entities/neurons):
Development — Required for neurogenesisCell cycle control — Post-mitotic neurons exit cell cycleSynaptic plasticity — Regulates synaptic protein synthesisMemory formation — Activity-dependent cell cycle re-entry [@liu2009][@abdurashidova2012]Role in Neurodegeneration
Alzheimer's Disease CDK4 is critically involved in AD:
Cell cycle re-entry — Post-mitotic neurons re-enter cell cycle[Aβ](/proteins/amyloid-beta) toxicity — Aβ induces CDK4 activation[Tau](/proteins/tau) phosphorylation — CDK4 can phosphorylate tauNeuronal death — Aberrant cell cycle leads to [apoptosis](/entities/apoptosis)CDK4 inhibitors are being explored for AD treatment [@sudthonguang2015].
Parkinson's Disease
Cell cycle dysregulation — Activated in PD brainsDopaminergic neuron loss — Contributes to neurodegeneration[α-Synuclein](/proteins/alpha-synuclein) toxicity — May interact with α-synuclein pathwayStroke
Ischemic injury — CDK4 activated after strokeTherapeutic potential — CDK4 inhibitors may be neuroprotectiveTherapeutic Implications CDK4 is a therapeutic target:
Cancer therapy — CDK4/6 inhibitors (palbociclib, ribociclib)Neurodegeneration — CDK4 inhibitors for AD and PDCombination therapy — May enhance other treatmentsKey Publications
PMID: 8125168 (https://pubmed.ncbi.nlm.nih.gov/8125168/) — Discovery of CDK4PMID: 8286351 (https://pubmed.ncbi.nlm.nih.gov/8286351/) — CDK4/Cyclin D structurePMID: 10625657 (https://pubmed.ncbi.nlm.nih.gov/10625657/) — CDK4 in cell cyclePMID: 15857886 (https://pubmed.ncbi.nlm.nih.gov/15857886/) — CDK4 in neuronal functionsPMID: 18559509 (https://pubmed.ncbi.nlm.nih.gov/18559509/) — CDK4 in Alzheimer's diseasePMID: 21479819 (https://pubmed.ncbi.nlm.nih.gov/21479819/) — CDK4 inhibition for neurodegeneration
See Also
[CDK4 Gene](/genes/cdk4)
[CDK6 Gene](/genes/cdk6)
[Cell Cycle](/mechanisms/cell-cycle)
[Alzheimer's Disease](/diseases/alzheimers-disease)
Background The study of Cdk4 Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
External Links
[PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
[Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
[Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data
References
Sherr CJ, et al, (1993) (1993)
Matsushime H, et al, (1994) (1994)
Russo AA, et al, (1998) (1998)
Liu J, et al, (2009) (2009)
Abdurashidova G, et al, (2012) (2012)
Sudthonguang C, et al, (2015) (2015) Show full description