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J Biol Chem, Vol. 275, Issue 14, 10477-10483, April 7, 2000
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From the The c-myc protooncogene product
(c-Myc) is a transcription factor and is rapidly induced in resting
cells following various mitogenic stimuli. c-Myc is thus suggested to
play an important role in the transition from quiescence to
proliferation. Despite numerous studies, including those on the
connection between cyclin E/cyclin-dependent kinase 2 and c-Myc, little
has been clarified about c-Myc in terms of the cell cycle regulation.
Here we show that c-Myc can directly bind to the carboxyl-terminal
region of the cyclin-dependent kinase inhibitor
p21cip1/waf1/sdi1 and thus partially relieves the p21 of the
inhibitory effect on DNA synthesis directed by the proliferating cell
nuclear antigen-dependent DNA polymerase
Graduate School of Pharmaceutical Sciences,
¶ College of Medical Technology, Hokkaido University, Kita-ku,
Sapporo 060-0812, Japan and § Faculty of Biological Science,
Nara Institute of Science and Technology, Ikoma,
Nara 630-0101, Japan
. As for
transcription, on the other hand, the p21 binding to the Myc box II
region of c-Myc blocks c-Myc-Max complex formation on the E-box and
thereby suppresses the transcriptional activation from the E-box by
c-Myc. These results suggest that c-Myc activates DNA replication via
inactivation of p21 and that p21, vice versa, represses the
transcriptional activity of c-Myc. The balance of the reciprocal
inactivation between c-Myc and p21 may determine the course of cellular
processes such as cell proliferation, differentiation, and apoptosis.
To whom correspondence should be addressed: Graduate School of
Pharmaceutical Sciences, Hokkaido University, Kita 12 Nishi 6, Kita-ku,
Sapporo 060-0812, Japan. Tel.: 81-11-706-3745; Fax: 81-11-706-4988;
E-mail: hiro@pharm.hokudai.ac.jp.
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