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- W2365389849 abstract "The influence of new water soluble cationic metalloporphyrin Cu(II)TOEPyP(4) (meso-tetra-(4-N-oxy- ethylpyridyl)), analogue of Cu(II)TMPyP(4), on thermody- namic stability of DNA at various molar ratios of r = porphyrin/DNA b.p. (0 r 0.12) has been studied. It has been shown that Cu(II)TOEPyP(4) is a strong stabilizing agent for calf thymus DNA increasing its melting tempera- ture from 75.5 to 99.5 C, in the range 0 r 0.06. The melting enthalpy (DHm) does not change in the range 0.002 r 0.06 and it equals to 11.6 ± 0.8 cal/g. At r ( 0.07, DHm and Tm decrease, and at r = 0.12 they equal to 6.4 ± 0.6 cal/g and 92.5 C, accordingly. We suggest that such centers of binding are the well documented 5 0 CG3 0 sites and G-quadruplex at r 0.01, and negatively charged phosphate groups at r ( 0.01. On the basis of DHm invari- ability with simultaneous increase of Tm in the range 0.002 r 0.06, it is shown that the DNA-Cu(II)TOE- PyP(4) complex melting is not of an enthalpic nature but of an entropic one. The two-phase helix-coil transition of DNA at r 0.01 is considered as a result of porphyrin redistri- bution in the melting process." @default.
- W2365389849 created "2016-06-24" @default.
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- W2365389849 date "2012-01-01" @default.
- W2365389849 modified "2023-09-27" @default.
- W2365389849 title "Jamlet R. MonaselidzeMaya T. KiladzeMaya Z. Gorgoshidze • David G. KhachidzeVasil G. BregadzeEteri M. Lomidze •" @default.
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