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Mol. Cell. Biol., 12 1996, 6623-6633, Vol 16, No. 12
PD Adams, WR Sellers, SK Sharma, AD Wu, CM Nalin and WG Kaelin Jr
Understanding how cyclin-cdk complexes recognize their substrates is a
central problem in cell cycle biology. We identified an E2F1-derived
eight-residue peptide which blocked the binding of cyclin A and E-cdk2
complexes to E2F1 and p21. Short peptides spanning similar sequences in
p107, p130, and p21-like cdk inhibitors likewise bound to cyclin A-cdk2 and
cyclin E-cdk2. In addition, these peptides promoted formation of stable
cyclin A-cdk2 complexes in vitro but inhibited the phosphorylation of the
retinoblastoma protein by cyclin A- but not cyclin B-associated kinases.
Mutation of the cyclin-cdk2 binding motifs in p107 and E2F1 likewise
prevented their phosphorylation by cyclin A- associated kinases in vitro.
The cdk inhibitor p21 was found to contain two functional copies of this
recognition motif, as determined by in vitro kinase binding/inhibition
assays and in vivo growth suppression assays. Thus, these studies have
identified a cyclin A- and E-cdk2 substrate recognition motif. Furthermore,
these data suggest that p21- like cdk inhibitors function, at least in
part, by blocking the interaction of substrates with cyclin-cdk2 complexes.
Copyright © 1996, American Society for Microbiology
Identification of a cyclin-cdk2 recognition motif present in substrates and p21-like cyclin-dependent kinase inhibitors
Dana-Farber Cancer Institute and Harvard Medical School, Boston, Massachusetts 02118, USA.
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