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- W1528334506 abstract "The radA gene is an archaeal homolog of bacterial recA and eukaryotic RAD51 genes, which are critical components in homologous recombination and recombinational DNA repair. We cloned the radA gene from a hyperthermophilic archaeon, Pyrobaculum islandicum, overproduced the radA gene product in Escherichia coli and purified it to homogeneity. The purified P. islandicum RadA protein maintained its secondary structure and activities in vitro at high temperatures, up to 87 °C. It also showed high stability of 18.3 kcal·mol−1 (76.5 kJ·mol−1) at 25 °C and neutral pH. P. islandicum RadA exhibited activities typical of the family of RecA-like proteins, such as the ability to bind ssDNA, to hydrolyze ATP in a DNA-dependent manner and to catalyze DNA strand exchange. At 75 °C, all DNAs tested stimulated ATPase activity of the RadA. The protein exhibited a break in the Arrhenius plot of ATP hydrolysis at 75 °C. The cooperativity of ATP hydrolysis and ssDNA-binding ability of the protein above 75 °C were higher than at lower temperatures, and the activation energy of ATP hydrolysis was lower above this break point temperature. These results suggest that the ssDNA-dependent ATPase activity of P. islandicum RadA displays a temperature-dependent capacity to exist in two different catalytic modes, with 75 °C being the critical threshold temperature." @default.
- W1528334506 created "2016-06-24" @default.
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- W1528334506 date "2000-02-01" @default.
- W1528334506 modified "2023-10-16" @default.
- W1528334506 title "The RadA protein from a hyperthermophilic archaeon Pyrobaculum islandicum is a DNA-dependent ATPase that exhibits two disparate catalytic modes, with a transition temperature at 75 °C" @default.
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- W1528334506 doi "https://doi.org/10.1046/j.1432-1327.2000.01108.x" @default.
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