This family includes the fifth essential DNA polymerase in yeast EC:2.7.7.7. Pol5p is localised exclusively to the nucleolus and binds near or at the enhancer region of rRNA-encoding DNA repeating units.

1: The fifth essential DNA polymerase phi in Saccharomyces cerevisiae is localized to the nucleolus and plays an important role in synthesis of rRNA. Shimizu K, Kawasaki Y, Hiraga S, Tawaramoto M, Nakashima N, Sugino A; Proc Natl Acad Sci U S A 2002;99:9133-9138. PMID:12093911