Reference: Pabla R, et al. (2008) Regulation of Saccharomyces cerevisiae DNA polymerase eta transcript and protein. Radiat Environ Biophys 47(1):157-68

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Abstract


RAD30-encoded DNA polymerase eta functions as a translesion polymerase that can bypass the most frequent types of UV-induced pyrimidine photoproducts in an error-free manner. Although its transcript is UV-inducible in Saccharomyces cerevisiae, Rad30 (studied as a Rad30-Myc fusion) is a stable protein whose levels do not fluctuate following UV treatment or during cell cycle progression. Rad30 protein is subject to monoubiquitination whose level is upregulated in G1 and downregulated during S-phase reentry. This downregulation is accelerated in UV-treated cells. A missense mutation (L577Q) of the ubiquitin binding domain (UBZ) confers a reduced degree of ubiquitination outside of G1 and a complete failure to stably interact with ubiquitinated substrates. This mutation confers a phenotype resembling a complete RAD30 deletion, thus attesting to the significance of the UBZ motif for polymerase eta function in vivo.

Reference Type
Journal Article
Authors
Pabla R, Rozario D, Siede W
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