Salt effects on equilibrium and kinetics of the reaction of tetrakis(1-methyl-4-pyridinio)porphine with DNA.
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概要
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The association reaction of tetrakis(1-methyl-4-pyridinio)porphine (TMpyP) with salmon testes DNA has been investigated spectrophotometrically, statically, and kinetically in buffers containing different concentrations of Na<SUP>+</SUP>. Free TMpyP had an absorption maximum at 424 nm, which decreased with increasing DNA concentration. At the low Na<SUP>+</SUP> concentrations of less than 1.20×10<SUP>−1</SUP> mol dm<SUP>−3</SUP> the minimal absorbance at the wavelength was reached by less than 1×10<SUP>4</SUP> mol dm<SUP>−3</SUP> DNA. On the other hand, near the end of the titration at the high DNA concentrations at 2.20×10<SUP>1</SUP> mol dm<SUP>−3</SUP> Na<SUP>+</SUP>, the absorbance no longer continued to decrease but displayed a small absorbance increase. The dependence of the association constant on the Na<SUP>+</SUP> concentration indicated that less than one ion-pair contributed to a formation of the complex between TMpyP and DNA if there was the same reaction mechanism at the Na<SUP>+</SUP> concentration range used in the experiment. These results of the spectra and the association constants suggested that a mechanism of the reaction might be different at the low and high salt concentrations. Kinetic results by a micro stopped-flow method showed that the reaction was a single step at the low Na<SUP>+</SUP> concentration, while at the high Na<SUP>+</SUP> concentration it consisted of two steps.
- 公益社団法人 日本化学会の論文
著者
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Sugimoto Naoki
Department Of Cardiology Kanazawa Municipal Hospital
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Sasaki Muneo
Department Of Chemistry Faculty Of Science And Engineering Konan University
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Hasegawa Keiko
Department Of Applied Biological Science Tokyo Noko University
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