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    J Biol Chem. 1998 Aug 21;273(34):21447-50.

    Nuclease activities in a complex of human recombination and DNA repair factors Rad50, Mre11, and p95.

    Trujillo KM, Yuan SS, Lee EY, Sung P.

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    Department of Molecular Medicine/Institute of Biotechnology, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78245-3207, USA.

    Abstract

    Genetic studies in yeast have indicated a role of the RAD50 and MRE11 genes in homologous recombination, telomere length maintenance, and DNA repair processes. Here, we purify from nuclear extract of Raji cells a complex consisting of human Rad50, Mre11, and another protein factor with a size of about 95 kDa (p95), which is likely to be Nibrin, the protein encoded by the gene mutated in Nijmegen breakage syndrome. We show that the Rad50-Mre11-p95 complex possesses manganese-dependent single-stranded DNA endonuclease and 3' to 5' exonuclease activities. These nuclease activities are likely to be important for recombination, repair, and genomic stability.

    PMID:
    9705271
    [PubMed - indexed for MEDLINE]
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