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1 Institute for Virus Research, Kyoto University, 53 Shogoin-Kawaracho, Sakyo-ku, Kyoto 606-8507, Japan
2 Graduate School of Medicine, Nagoya University, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan
3 Graduate School of Frontier Biosciences, Osaka University, 1-3 Yamadaoka, Suita, Osaka 565-0871, Japan
4 RIKEN, DRI and CREST, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Pol
is one of many DNA polymerases involved in translesion DNA synthesis (TLS). It belongs to the Y-family of polymerases along with Pol
, Pol
and hREV1. Unlike Pol
encoded by the xeroderma pigmentosum variant (XPV) gene, Pol
is unable to bypass UV-induced DNA damage in vitro, but it is able to bypass benzo[a]pyrene (B[a]P)-adducted guanines accurately and efficiently. In an attempt to identify factor(s) targeting Pol
to its cognate DNA lesion(s), we searched for Pol
-interacting proteins by using the yeast two-hybrid assay. We found that Pol
interacts with a C-terminal region of hREV1. Pol
and Pol
were also found to interact with the same region of hREV1. The interaction between Pol
and hREV1 was confirmed by pull-down and co-immunoprecipitation assays. The C-terminal region of hREV1 is known to interact with hREV7, a non-catalytic subunit of Pol
that is another structurally unrelated TLS enzyme, and we show that Pol
and hREV7 bind to the same C-terminal region of hREV1. Thus, our results suggest that hREV1 plays a pivotal role in the multi-enzyme, multi-step process of translesion DNA synthesis.
* Correspondence: E-mail: hohmori{at}virus.kyoto-u.ac.jp
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