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The 3′ to 5′ exonuclease activity located in the DNA polymerase delta subunit of Saccharomyces cerevisiae is required for accurate replication.
Author(s) -
Simon M.,
Giot L.,
Faye G.
Publication year - 1991
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1002/j.1460-2075.1991.tb07751.x
Subject(s) - biology , exonuclease , marie curie , dna polymerase , saccharomyces cerevisiae , microbiology and biotechnology , dna replication , protein subunit , genetics , dna , physics , gene , european union , economic policy , business
In Saccharomyces cerevisiae, DNA polymerase delta (POLIII), the product of the CDC2 (POL3) gene, possesses, in its N‐terminal half, the well conserved 3‐domain 3′ to 5′ exonuclease site. Strains selectively mutagenized in this site display a mutator phenotype detected as a drastically increased spontaneous forward mutation rate to canavanine resistance or as an elevated reversion rate to lysine prototrophy. Assays on a partially purified extract of the mutant giving the largest mutator effect indicate that the 3′ to 5′ exonuclease activity is reduced below the detection limit whereas the DNA polymerizing activity has wild‐type level. Therefore, our results provide experimental support for the hypothesis that the exonucleolytic proofreading activity associated with DNA polymerase delta resides on the DNA polymerase delta subunit and enhances the fidelity of DNA replication in yeast.