Unique and Overlapping Functions of the Exo1, Mre11 and Pso2 Nucleases in DNA Repair

Overview

Journal DNA Repair (Amst)

Publisher Elsevier

Specialties Biochemistry
Molecular Biology

Date 2008 Feb 26

PMID 18295552

Citations 8

Authors

Alicia F Lam

Berit O Krogh

Lorraine S Symington

Affiliations

Soon will be listed here.

Abstract

The Mre11 and Pso2 nucleases function in homologous recombination and interstrand cross-link (ICL) repair pathways, respectively, while the Exo1 nuclease is involved in homologous recombination and mismatch repair. Characterization of the sensitivity of single, double and triple mutants for these nucleases in Saccharomyces cerevisiae to various DNA damaging agents reveals complex interactions that depend on the type of DNA damage. The pso2 mutant is uniquely sensitive to agents that generate ICLs and mre11-H125N shows the highest sensitivity of the single mutants for ionizing radiation and methyl methane sulfonate. However, elimination of all three nucleases confers higher sensitivity to IR than any of the single or double mutant combinations indicating a high degree of redundancy and versatility in the response to DNA damage. In response to ICL agents, double-strand breaks are still formed in the triple nuclease mutant indicating that none of these nucleases are responsible for unhooking cross-links.

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