Three-State Diagram for DNA |
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Authors: | Valery I Ivanov Dmitry Yu Krylov Elvira E Minyat |
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Institution: | Institute of Molecular Biology, USSR Academy of Sciences , Vavilov Str. 32, Moscow , 117984 , USSR |
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Abstract: | Abstract Experimental phase diagrams (A form, B form, Coil) were built in the coordinates (a, alcohol fraction: T, temperature) for the natural DNAs and poly d(A-T). The main parameter of the B-A transition,—cooperativity length, v o, was estimated by the slopes of the branches A-B, A-Coil, B-Coil in the vicinity of the triple point: v o +AD0- 10-20 base pairs, which corresponds to the energy for the B/A junction of 1.2–1.8 kcal/mol. We discovered two new effects which are due to the coexistence of the three different conformations in one polymeric molecule: an increase in the melting temperature above that for the ‘ideal’ triple point (i.e. for the case of the ideal phase transitions); a widening of the melting curve within the B-A transition range. The physics of these phenomena is discussed. |
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Keywords: | Leishmania eIF-4A Adjuvant epitope Homology modeling Molecular dynamics |
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