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- _5 value "Site-directed mutagenesis identified phenylalanine 79 and tyrosine 80 within the 3(10) helix region of p57 as crucial residues for kinase inhibition, supporting the structural evidence that the 3(10) helix binds deep inside the catalytic cleft of Cdk2, mimicking ATP. Mutations within the 3(10) helix region of the p57 molecule completely abolished the ability to arrest the cell cycle at G1 in vivo. These results indicate that this region is specifically utilized by p57 in selectively inhibiting cyclin A or E/Cdk2+ activities. Thus the 3(10) helix motif may confer a specific regulatory mechanism by which p57 differentially regulates Cdk2 and Cdk4 activities." provenance.
- _5 wasQuotedFrom 9632724 provenance.