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Mol. Cell. Biol., Dec 1995, 6535-6544, Vol 15, No. 12
KK Wong, X Zou, KT Merrell, AJ Patel, KB Marcu, S Chellappan and K Calame
The v-abl oncogene of Abelson murine leukemia virus encodes a deregulated
form of the cellular nonreceptor tyrosine kinase. v-Abl activates c-myc
transcription, and c-Myc is an essential downstream component in the v-Abl
transformation program. To explore the mechanism by which v-Abl activates
c-myc transcription, a cotransfection assay was developed. We show that
transactivation of a c-myc promoter by v- Abl requires the SH1 (tyrosine
kinase) and SH2 domains of v-Abl; the C- terminal domains are not required
for transactivation. The assay also identified the E2F site in the c-myc
promoter as a v-Abl-responsive element. In addition, multimerized E2F sites
were shown to be sufficient to confer v-Abl-dependent activation on a
minimal promoter. This is the first identification of a v-Abl response
element for transcriptional activation. v-Abl tyrosine kinase-dependent
changes in proteins binding the c-myc E2F site were also demonstrated,
including induction of a complex containing DP1, p107, cyclin A, and cdk2.
Identification of v-Abl-dependent changes in E2F-binding proteins provides
an important link between v-Abl, transcription, cell cycle regulation, and
control of cellular growth.
Copyright © 1995, American Society for Microbiology
v-Abl activates c-myc transcription through the E2F site
Integrated Program in Cellular, Molecular and Biophysical Studies, Columbia University College of Physicians and Surgeons, New York, New York 10032, USA.
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