Reference: Araki H, et al. (1992) DNA polymerase II, the probable homolog of mammalian DNA polymerase epsilon, replicates chromosomal DNA in the yeast Saccharomyces cerevisiae. EMBO J 11(2):733-40

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Abstract

Two temperature-sensitive DNA polymerase II mutants (pol2-9 and pol2-18) of the yeast Saccharomyces cerevisiae were isolated by the plasmid shuffling method. DNA polymerase II activity partially purified from both mutants was thermolabile, while DNA polymerase I and III activities remained thermotolerant. At the restrictive temperature, the pol2 mutants were defective in chromosomal DNA replication and exhibited the dumbbell terminal morphology typical of DNA replication mutants. The POL2 transcript accumulated periodically during the cell cycle, peaking at the G1/S boundary in the same manner as the transcripts of more than 10 other DNA replication genes. These results indicate that DNA polymerase II participates in nuclear DNA replication. The similarities in structure and activities between the DNA polymerases of yeast and mammals make it likely that mammalian DNA polymerase epsilon too is required for chromosomal DNA replication.

Reference Type
Journal Article
Authors
Araki H, Ropp PA, Johnson AL, Johnston LH, Morrison A, Sugino A
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