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- W1546701310 abstract "ABSTRACT The flap endonuclease (FEN) of the hyperthermophilic archaeon Methanococcus jannaschii was expressed in Escherichia coli and purified to homogeneity. FEN retained activity after preincubation at 95°C for 15 min. A pseudo-Y-shaped substrate was formed by hybridization of two partially complementary oligonucleotides. FEN cleaved the strand with the free 5′ end adjacent to the single-strand–duplex junction. Deletion of the free 3′ end prevented cleavage. Hybridization of a complementary oligonucleotide to the free 3′ end moved the cleavage site by 1 to 2 nucleotides. Hybridization of excess complementary oligonucleotide to the free 5′ end failed to block cleavage, although this substrate was refractory to cleavage by the 5′-3′ exonuclease activity of Taq DNA polymerase. For verification, the free 5′ end was replaced by an internally labeled hairpin structure. This structure was a substrate for FEN but became a substrate for Taq DNA polymerase only after exonucleolytic cleavage had destabilized the hairpin. A circular duplex substrate with a 5′ single-stranded branch was formed by primer extension of a partially complementary oligonucleotide on virion φX174. This denaturation-resistant substrate was used to examine the effects of temperature and solution properties, such as pH, salt, and divalent ion concentration on the turnover number of the enzyme." @default.
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- W1546701310 date "1998-10-15" @default.
- W1546701310 modified "2023-10-16" @default.
- W1546701310 title "Methanococcus jannaschii Flap Endonuclease: Expression, Purification, and Substrate Requirements" @default.
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- W1546701310 doi "https://doi.org/10.1128/jb.180.20.5406-5412.1998" @default.
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