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Article Addendum

A role for PCNA2 in translesion synthesis by Arabidopsis thaliana DNA polymerase η

Bernard A. Kunz

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Eukaryotic DNA polymerase η (Polη) confers ultraviolet (UV) resistance by catalyzing translesion synthesis (TLS) past UV photoproducts. Polη has been studied extensively in budding yeast and mammalian cells, where its interaction with monoubiquitylated proliferating cell nuclear antigen (PCNA) is necessary for its biological activity. Recently, in collaboration with other investigators, our laboratory demonstrated that Arabidopsis thaliana Polη is required for UV resistance in plants. Furthermore, the purified enzyme can perform TLS opposite a cyclobutane pyrimidine dimer and interacts with PCNA. Intriguingly, the biological activity of Polη in a heterologous yeast assay depends on co expression with Arabidopsis PCNA2 and Polη sequences implicated in binding PCNA or ubiquitin. We suggest that interaction of Arabidopsis Polη with ubiquitylated PCNA2 is required for TLS past UV photoproducts by Polη.

Addendum to: Anderson HJ, Vonarx EJ, Pastushok L, Nakagawa M, Katafuchi A, Gruz P, Di Rubbo A, Grice DM, Osmond MJ, Sakamoto AN, Nohmi T, Xiao W, Kunz BA. Arabidopsis thaliana Y family DNA polymerase η catalyses translesion synthesis and interacts functionally with PCNA2. Plant J 2008; doi: 10.1111/j.1365-313X.2008.03562.x.

Authors

Bernard A. Kunz

School of Life and Environmental Sciences, Deakin University, Geelong, Victoria, Australia

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