Poly (ADP‐ribose) polymerase inhibits DNA replication by human replicative DNA polymerase α, δ and ε in vitro
- 19 December 1994
- journal article
- research article
- Published by Wiley in FEBS Letters
- Vol. 356 (2-3) , 261-266
- https://doi.org/10.1016/0014-5793(94)01280-6
Abstract
The influence of poly (ADP-ribose) polymerase (PARP) and poly ADP-ribosylation on DNA synthesis supported by human replicative DNA polymerase (DNA pol) α, δ, and ε has been examined using the replication system containing poly(dA)4500-oligo(dT)12–18 as the template primer. PARP alone inhibited the pol activities in a dose-dependent manner even in the presence of the accessory factors for DNA pol δ, proliferating cell nuclear antigen (PCNA) and activator 1 (A1; RF-C). Both DNA pol α and ε activities were decreased approximately 10-fold under the poly ADP-ribosylating condition. In contrast, DNA synthesis by DNA pol δ holoenzyme was not affected by poly ADP-ribosylation like prokaryotic DNA pol's. The analysis of poly(dT) formed by DNA pol α and ε indicated that poly ADP-ribosylation mainly reduced the frequency of replication. These observations suggest a possibility that PARP acts as a negative regulator for the initiation of DNA replication upon cellular DNA damage.Keywords
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