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- W2143168119 abstract "Werner syndrome is a rare autosomal recessive disease characterized by a premature aging phenotype, genomic instability, and a dramatically increased incidence of cancer and heart disease. Mutations in a single gene encoding a 1432-amino acid helicase/exonuclease (hWRN) have been shown to be responsible for the development of this disease. We have cloned, overexpressed, and purified a minimal, 171-amino acid fragment of hWRN that functions as an exonuclease. This fragment, encompassing residues 70-240 of hWRN (hWRN-N(70-240)), exhibits the same level of 3'-5' exonuclease activity as the previously described exonuclease fragment encompassing residues 1-333 of the full-length protein. The fragment also contains a 5'-protruding DNA strand endonuclease activity at a single-strand-double-strand DNA junction and within single-stranded DNA, as well as a 3'-5' exonuclease activity on single-stranded DNA. We find hWRN-N(70-240) is in a trimer-hexamer equilibrium in the absence of DNA when examined by gel filtration chromatography and atomic force microscopy. Upon addition of DNA substrate, hWRN-N(70-240) forms a hexamer and interacts with the recessed 3'-end of the DNA. Moreover, we find that the interaction of hWRN-N(70-240) with the replication protein PCNA also causes this minimal, 171-amino acid exonuclease region to form a hexamer. Thus, the active form of this minimal exonuclease fragment of human WRN appears to be a hexamer. The implications these results have on our understanding of hWRN's roles in DNA replication and repair are discussed." @default.
- W2143168119 created "2016-06-24" @default.
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- W2143168119 date "2002-02-08" @default.
- W2143168119 modified "2023-09-26" @default.
- W2143168119 title "A Minimal Exonuclease Domain of WRN Forms a Hexamer on DNA and Possesses both 3‘−5‘ Exonuclease and 5‘-Protruding Strand Endonuclease Activities" @default.
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- W2143168119 doi "https://doi.org/10.1021/bi0157161" @default.
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