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Poly(ADP-ribose) polymerase 1 (PARP-1)-deficient mice are protected against septic shock, diabetes type I, stroke, and inflammation.
We report that primary cells from PARP-1 â/â animals are impaired in κB-dependent transcriptional activation induced by different stimuli involved in inflammatory and
genotoxic stress signaling. PARP-1 was also required for p65-mediated transcriptional activation. PARP-1 enzymatic inhibitors
did not inhibit the transcriptional activation of a κB-dependent reporter gene in wild type cells. Remarkably, neither the
enzymatic activity nor the DNA binding activity of PARP-1 was required for κB-dependent transcriptional activation in PARP-1 â/â cells complemented with different PARP-1 mutants. However, PARP-1 interacted in vitro directly with both subunits of NF-κB (p50 and p65), and mapping of the interaction domains revealed that both subunits bind
to different PARP-1 domains. Furthermore, a PARP-1 mutant lacking the enzymatic and DNA binding activity interacted comparably
to the wild type PARP-1 with p65 or p50. Finally, we showed that PARP-1 is activating the natural inducible nitric-oxide synthase
and P-selectin promoter in a κB-dependent manner upon stimulation of the cells with inflammatory stimuli or cotransfection
of p65. Our results provide evidence that neither the DNA binding nor the enzymatic activity of PARP-1 but its direct protein-protein
interaction with both subunits of NF-κB is required for its coactivator function, thus expanding the role of PARP-1 as an
essential and novel classical transcriptional coactivator for κB-dependent gene expression in vivo .
Sprache
Englisch
Identifikatoren
ISSN: 0021-9258
eISSN: 1083-351X
DOI: 10.1074/jbc.M106528200
Titel-ID: cdi_highwire_biochem_276_49_45588
Format
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