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- W1528099054 abstract "The Mn2+-dependent endonuclease activity associated with the avian myeloblastosis virus RNA-directed DNA polymerase has been shown to be activated by ATP in the presence of Mg2+. In the presence of Mn2+ the endonucleolytic activity was stimulated about 3-fold by the addition of ATP. The earlier identified Mr = 40,000 Friend murine leukemia virus (F-MuLV)-associated endonuclease which functions in the presence of both Mg2+ and Mn2+ has also been shown to be similarly stimulated by ATP. For both endonuclease activities stimulation was only observed at ATP concentrations above 0.5 mM, and it did not increase upon elevating the ATP concentration above 2.5 mM. ADP and dATP also stimulated both activities, although not to the same extent as ATP. GTP had no apparent effect and AMP seemed to inhibit both activities. The effect ATP analogs had on the F-MuLV associated endonuclease activity could suggest that the endonuclease reaction in the presence of ATP might involve the cleavage of beta-gamma phosphate bonds in ATP. Neither adenyl-5'-yl imidodiphosphate nor (beta, gamma-methylene)adenosine 5'-triphosphate stimulated the activity, whereas significant stimulation was observed in the presence of (alpha, beta-methylene)adenosine 5'-triphosphate. Although no ATPase activity could be detected in the purified F-MuLV endonuclease preparation, the data do not exclude the possibility that ATP may be cleaved in amounts which are equivalent to the number of nicks introduced into DNA by the virus-associated endonuclease. In the presence of ATP and Mg2+ the F-MuLV-associated endonuclease nicked both supercoiled and linear DNA duplexes extensively, although the former was nicked more readily than the latter. Single-stranded DNA functioned poorly as a substrate. The nicks introduced by the enzyme contained a 5'-phosphoryl terminus and a 3'-hydroxyl group." @default.
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- W1528099054 date "1981-08-01" @default.
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- W1528099054 title "Effect of ATP on the Friend Murine leukemia virus-associated endonuclease activity and the endonuclease activity of the avian myeloblastosis virus RNA-directed DNA polymerase." @default.
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- W1528099054 doi "https://doi.org/10.1016/s0021-9258(18)43376-5" @default.
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