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- W2069453402 abstract "Abstract We have investigated the ways by which magnesium (II), calcium (II) and barium (II) and their ATP complexes bind to B-DNA. Effects on native calf thymus DNA conformation were studied and compared with those involving the uncomplexed metal ions and the polymer. It was found that MgATP−2, CaATP−2 and BaATP−2, interact with the phosphates of the polynucleotide; only BaATP −2 appears to bind also through the bases. ATP complexes cause transitions mainly to the B family. The C form is induced by small amounts of MgATP −2 or CaATP−2. At high complex concentrations (r = 2.5 or 5) the polynucleotide adopts the ψ conformation, while BaATP−2 induces this transition at r = 0.6. A contribution of the A form is observed in the case of CaATP-DNA at r = 0.6 and at the beginning of the reaction in the Ba-DNA system at 22°C, for r = 5. The alkaline earth metal ions induce a stabilization of the B conformation. Structural changes with magnesium (II) at r = 2.5 are interpreted in terms of a B to C transition. Calcium (II) at r = 5 produces the A form. In other cases the alkaline earth metal ions stabilize the B conformation. It was found that they all interact with the phosphates of the polynucleotide. The binding ratio, r, is an important factor in all structural changes. Key Words: DNAgroup IIA cationsATP complexescircular dichroismthermal Denaturation" @default.
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- W2069453402 date "1998-01-01" @default.
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- W2069453402 title "DNA BINDING STUDIES OF MAGNESIUM(II), CALCIUM(II), BARIUM(II) AND ATP COMPLEXES" @default.
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- W2069453402 doi "https://doi.org/10.1080/00958979808022865" @default.
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