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The protein encoded by this gene is a member of the cyclin-dependent protein kinase (CDK) family. CDK family members are highly similar to the gene products of Saccharomyces cerevisiae cdc28 , and Schizosaccharomyces pombe cdc2 , and are known to be important regulators of cell cycle progression .
Without cyclin, CDK is less active than in the cyclin-CDK heterodimer complex. [ 5 ] [ 6 ] CDKs phosphorylate proteins on serine (S) or threonine (T) residues. The specificity of CDKs for their substrates is defined by the S/T-P-X-K/R sequence, where S/T is the phosphorylation site, P is proline, X is any amino acid, and the sequence ends with ...
The CDK4 gene is located on chromosome 12 in humans. [7] The gene is composed of 4,583 base pairs which together code for the 303 amino acid protein with a molecular mass of 33,730 Da. [7] [8] All CDK proteins, including CDK4, have two lobes: the smaller N-terminal lobe (which contains an inhibitory G-loop), and the C terminal lobe (which contains an activation domain and a T-loop).
1018 n/a Ensembl ENSG00000250506 n/a UniProt Q00526 n/a RefSeq (mRNA) NM_001258 n/a RefSeq (protein) NP_001249 n/a Location (UCSC) Chr 17: 76 – 76.01 Mb n/a PubMed search n/a Wikidata View/Edit Human Cell division protein kinase 3 is an enzyme that in humans is encoded by the CDK3 gene. Function CDK3 complements cdc28 mutants of Saccharomyces cerevisiae suggesting that it may be involved in ...
Fig. 1 The diagram shows the role of Cdk1 in progression through the S. cerevisiae cell cycle. Cln3-Cdk1 leads to Cln1,2-Cdk1 activity, eventually resulting in Clb5,6-Cdk1 activity and then Clb1-4-Cdk1 activity. [5] When bound to its cyclin partners, Cdk1 phosphorylation leads to cell cycle progression.
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Then, the CDK inhibitor initiates a small helix into the cleft, blocking the cleft and blocking the active site of the CDK. Eventually, it releases the ATP out of the aperture of the CDK and deactivates it. Cyclin-dependent kinase inhibitor proteins use ATP as a phosphate contributor to phosphorylate serine and threonine residues. [5] [6]
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