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J. Biol. Chem., Vol. 276, Issue 11, 7932-7936, March 16, 2001
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From the Overexpression of the transcription factor
YY1 activates DNA synthesis in differentiated primary human coronary
artery smooth muscle cells. Overexpression of the retinoblastoma
protein together with YY1 blocked this effect. In growth-arrested
cells, YY1 resides in a complex with the retinoblastoma protein, but
the complex is not detected in serum-stimulated S phase cultures,
indicating that the interaction of the retinoblastoma protein and YY1
is cell cycle-regulated. Recombinant retinoblastoma protein directly interacts with YY1, destabilizing the interaction of YY1 with DNA and
inhibiting its transcription initiator function in vitro. We conclude that in differentiated cells elevation of the nuclear level
of YY1 protein favors progression into the S phase, and we propose that
this activity is regulated by its interaction with the retinoblastoma protein.
Department of Medicine, Beth Israel
Deaconess Medical Center, Harvard Medical School,
Boston, Massachuttes 02215 and the § Department of
Molecular Biology, Princeton University,
Princeton, New Jersey 08544
To whom correspondence should be addressed: Div. of
Endocrinology, Dept. of Medicine, Beth Israel Deconess Medical Center, Harvard Medical School, 99 Brookline Ave., R313, Boston, MA 02215. Tel.: 617-632-0522; Fax: 617-667-2927; E-mail:
ausheva@caregroup.harvard.edu.
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