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XB-ART-23248
Mol Biol Cell November 1, 1992; 3 (11): 1279-94.

Identification of the domains in cyclin A required for binding to, and activation of, p34cdc2 and p32cdk2 protein kinase subunits.

Kobayashi H , Stewart E , Poon R , Adamczewski JP , Gannon J , Hunt T .


Abstract
The binding of cyclin A to p34cdc2 and p32cdk2 and the protein kinase activity of the complexes has been measured by cell-free translation of the corresponding mRNA in extracts of frog eggs, followed by immunoprecipitation. A variety of mutant cyclin A molecules have been constructed and tested in this assay. Small deletions and point mutations of highly conserved residues in the 100-residue "cyclin box" abolish binding and activation of both p34cdc2 and p32cdk2. By contrast, large deletions at the N-terminus have no effect on kinase binding and activation, until they remove residues beyond 161, where the first conserved amino acids are found in all known examples of cyclin A. At the C-terminus, removal of 14 or more amino acids abolishes activity. We also demonstrate that deletion of, or point mutations, in the cyclin A homologue of the 10-residue "destruction box," previously described in cyclin B (Glotzer et al., 1991) abolish cyclin proteolysis at the transition from M-phase to interphase.

PubMed ID: 1333843
PMC ID: PMC275694
Article link: Mol Biol Cell
Grant support: [+]
Genes referenced: ccnb1.2 cdk1 tbx2

References [+] :
Brizuela, p13suc1 acts in the fission yeast cell division cycle as a component of the p34cdc2 protein kinase. 1988, Pubmed


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