Recognition and processing of double-stranded DNA by ExoX, a distributive 3′–5′ exonuclease

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Recognition and processing of double-stranded DNA by ExoX, a distributive 3′–5′ exonuclease

Members of the DnaQ superfamily are major 3'-5' exonucleases that degrade either only single-stranded DNA (ssDNA) or both ssDNA and double-stranded DNA (dsDNA). However, the mechanism by which dsDNA is recognized and digested remains unclear. Exonuclease X (ExoX) is a distributive DnaQ exonuclease that cleaves both ssDNA and dsDNA substrates. Here, we report the crystal structures of Escherichi...

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Isolation of cell free fetal DNA (cffDNA) from maternal serum usually leads to very low concentrations of DNA impeding further resolving through conventional methods of electrophoresis. Although several protocols have been described for capillary electrophoresis (CE) of double stranded DNA, they usually need using special polymers or coated capillaries which degrade over time. Herein, we propos...

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ژورنال

عنوان ژورنال: Nucleic Acids Research

سال: 2013

ISSN: 1362-4962,0305-1048

DOI: 10.1093/nar/gkt495