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J. Biol. Chem., Vol. 277, Issue 25, 22304-22313, June 21, 2002
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From the Infections of bacteria and viruses induce host
defense reactions known as innate responses including the activation of
interferon regulatory factor-3 (IRF-3), critical for the activation of
type I interferon system. Upon immediate early signals triggered by the
infection, IRF-3 is phosphorylated and a homodimer results. The
homodimer complexes with the coactivator CREB-binding protein (CBP)/p300 in the nucleus; thus, holocomplex of IRF-3 competent in DNA
binding is generated. We showed CBP/p300 to be indispensable for the
DNA binding activity of the holocomplex and to aid the binding through
direct interaction with the DNA. We demonstrated that p300 binds with
the IRF-3 homodimer via a Q-rich domain and that an intact histone
acetyltransferase (HAT) domain is indispensable for the DNA binding of
the holocomplex along with a CH3 domain, which connects the HAT and
Q-rich domains. These results highlight a novel function of CBP/p300:
direct involvement in sequence-specific DNA binding.
Furthermore, the critical function of these domains in virus-induced
gene activation was demonstrated in vivo by using p300 mutants.
Department of Tumor Cell Biology, Tokyo
Metropolitan Institute of Medical Science, 3-18-22 Honkomagome,
Bunkyo-ku, Tokyo 113-8613 and the § Chromatin Function in
Leukemogenesis Project, National Cancer Center Research Institute,
5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan
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