Journal
MOLECULAR AND CELLULAR BIOLOGY
Volume 25, Issue 21, Pages 9734-9740Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/MCB.25.21.9734-9740.2005
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- NCI NIH HHS [R01 CA107650, CA 107650] Funding Source: Medline
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The Rev1 protein of Saccharomyces cerevisiae functions in translesion synthesis (TLS) together with DNA polymerase (Pol) xi, which is comprised of the Rev3 catalytic and the Rev7 accessory subunits. Rev1, a member of the Y family of Pols, differs from other members in its high degree of specificity for incorporating a C opposite template G as well as opposite an abasic site. Although Rev1 is indispensable for Pol xi-dependent TLS, its DNA synthetic activity is not required for many of the Pol xi-dependent lesion bypass events. This observation has suggested a structural role for Rev1 in this process. Here we show that in yeast, Rev1 forms a stable complex with Rev7, and the two proteins copurify. Importantly, the polymerase-associated domain (PAD) of Rev1 mediates its binding to Rev7. These observations reveal a novel role for the PAD region of Rev1 in protein-protein interactions, and they raise the possibility of a similar involvement of the PAD of other Y family Pols in protein-protein interactions. We discuss the possible roles of Rev1 versus the Rev1-Rev7 complex in TLS.
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