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Mol. Cell. Biol., 01 1995, 338-344, Vol 15, No. 1
EJ Smith and JR Nevins
The interaction of the retinoblastoma susceptibility gene product (Rb)-
related p107 protein with the E2F transcription factor in S-phase cells
facilitates the formation of a multicomponent complex also containing
cyclin A and the p33cdk2 kinase. We have created a series of p107 mutants
to assess the ability of p107 to inhibit E2F function and the role of the
cyclin A/cdk2 complex in this process. We find that p107 mutants that do
not bind to E2F also fail to repress E2F-dependent transcription. Moreover,
we find that the ability of p107 to suppress E2F-dependent transcription is
not dependent on the ability of p107 to associate with cyclin A/cdk2.
Finally, an analysis of the ability of the p107 mutant proteins to suppress
cell growth suggests that both E2F- dependent and E2F-independent events
correlate with this activity.
Copyright © 1995, American Society for Microbiology
The Rb-related p107 protein can suppress E2F function independently of binding to cyclin A/cdk2
Department of Genetics, Howard Hughes Medical Institute, Duke University Medical Center, Durham, North Carolina 27710.
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