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J. Biol. Chem., Vol. 277, Issue 9, 7157-7164, March 1, 2002
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tros
§,
íková
,
From the The recently cloned gene
p73 is a close homologue of p53, which is a
crucial tumor suppressor gene for preventing the malignant transformation of cells by inducing cell cycle arrest and apoptosis. Previous reports have shown that architectural DNA-bending/looping chromosomal proteins HMGB1 and HMGB2 (formerly known as HMG1 and HMG2),
which function in a number of biological processes including transcription and DNA repair, interact in vitro with p53
and stimulate p53 binding to DNA containing p53 consensus sites. Here,
we report that HMGB1 physically interacts with two splicing variants of p73,
Institute of Biophysics, Academy of Sciences
of the Czech Republic, 612 65 Brno, Czech Republic, and the
¶ Division of Biochemistry, Chiba Cancer Center Research
Institute, Chiba 260-8717, Japan
and
(pull-down assay), and enhances binding of p73 to specific cognate DNA sites (gel-shift assay). Both HMG box domains of
HMGB1, A and B, interact with p73
. Association of HMGB1 with p73,
like the demonstrated ability of HMGB1 to stimulate p73 binding to
different p53-responsive elements, requires the oligomerization region
and/or region between DNA-binding domain and oligomerization domain of
p73 (residues 312-381). Transient transfections revealed that
ectopically expressed or endogenous HMGB1 and HMGB2 (antisense strategy) significantly inhibit in vivo both p73
/
-
and p53-dependent transactivation from the Bax
gene promoter (and much less from Mdm2 and
p21waf1 promoters) in p53-deficient SAOS-2
cells. In contrast, HMGB1 and HGMB2 stimulate p73- or
p53-dependent transactivation in p53-deficient H1299 cells,
irrespective of the promoter used. Our results suggest that
ubiquitously expressed HMGB1 and HMGB2 have potential to cell- and promoter-specifically down- or
up-regulate in vivo transcriptional activity of different
members of the p53 family. A possible mechanism of
HMGB1-mediated modulation of p73- and p53-dependent
transactivation is discussed.
.)., and by a grant-in-aid from the Ministry of Health and Welfare of Japan for a New
10-year Strategy of Cancer Control (to A. N.).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
§
Supported by the Foundation for Promotion of Cancer Research. To
whom correspondence may be addressed: Inst. of Biophysics, Academy of
Sciences of the Czech Republic, Královopolská 135, 612 65 Brno, Czech Republic. Tel.: 420-5-41517183; Fax: 420-5-41211293; E-mail: stros@ibp.cz.
To whom correspondence may be addressed: Division of
Biochemistry, Chiba Cancer Center Research Inst., 666-2 Nitona,
Chuoh-ku, Chiba 260-8717, Japan. Tel.: 81-43-264-5431; Fax:
81-43-265-4459; E-mail:
akiranak@chiba-ccri.chuo.chiba.jp.
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