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Mol. Cell. Biol., 06 1995, 3154-3163, Vol 15, No. 6
JH Kupper, M Muller, MK Jacobson, J Tatsumi-Miyajima, DL Coyle, EL Jacobson and A Burkle
Poly(ADP-ribosyl)ation is a posttranslational modification of nuclear
proteins catalyzed by poly(ADP-ribose) polymerase (PARP; EC 2.4.2.30), with
NAD+ serving as the substrate. PARP is strongly activated upon recognition
of DNA strand breaks by its DNA-binding domain. Experiments with
low-molecular-weight inhibitors of PARP have led to the view that PARP
activity plays a role in DNA repair and possibly also in DNA replication,
cell proliferation, and differentiation. Accumulating evidence for
nonspecific inhibitor effects prompted us to develop a molecular genetic
system to inhibit PARP in living cells, i.e., to overexpress selectively
the DNA-binding domain of PARP as a dominant negative mutant. Here we
report on a cell culture system which allows inducible, high-level
expression of the DNA-binding domain. Induction of this domain leads to
about 90% reduction of poly(ADP-ribose) accumulation after
gamma-irradiation and sensitizes cells to the cytotoxic effect of
gamma-irradiation and of N-methyl-N'-nitro-N- nitrosoguanidine. In
contrast, induction does not affect normal cellular proliferation or the
replication of a transfected polyomavirus replicon. Thus, trans-dominant
inhibition of the poly(ADP-ribose) accumulation occurring after
gamma-irradiation or N-methyl-N'-nitro-N- nitrosoguanidine is specifically
associated with a disturbance of the cellular recovery from the inflicted
damage.
Copyright © 1995, American Society for Microbiology
trans-dominant inhibition of poly(ADP-ribosyl)ation sensitizes cells against gamma-irradiation and N-methyl-N'-nitro-N-nitrosoguanidine but does not limit DNA replication of a polyomavirus replicon
Abteilung 0610, Angewandte Tumorvirologie, Deutsches Krebsforschungszentrum, Heidelberg, Germany.
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