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DNA-binding properties and photocleavage activity of cationic water-soluble chlorophyll derivatives

机译:阳离子水溶性叶绿素衍生物的DNA结合性质和光解活性

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Three cationic water-soluble chlorin e(6) derivatives, that is, 6a-,gamma b-,7c-tris(2-trimethylammonioethyl)chlorin e6 (1), 6a-gamma b-,7c-tris(3-methylpyridiniummethyl)chlorin e6 (2), and 6a-,gamma b-, 7c-tris(2-trimethylammonioethyl)-2-(3-trimethylammonioprop-l-enyl)chlorin e(6) (3), have been designed and synthesized to allow the study of their DNA-binding and -photocleavage activities. The DNA-unwinding assay, measurements of melting temperatures of double-stranded DNA, and the induced CD and visible absorption spectra have revealed that 1 and 3 are intercalated into the base pairs of the double-helical DNA, while 2 is bound to outside the minor groove of the double-helical DNA. The cationic water-soluble chlorin e(6) derivatives effectively cleave the double-helical DNA under photo-irradiation and the DNA-photocleavage activity increases in the order 3 > 1 > 2. The DNA-binding and -photocleavage characteristics of the three cationic water-soluble chlorin e6 derivatives are influenced by aspects of their molecular structure, such as the kind, number, and position of the cationic substituents.
机译:三种阳离子水溶性二氢卟吩e(6)衍生物,即6a-,γb-,7c-三(2-三甲基氨乙基)二氢卟酚e6(1),6a-γb-,7c-三(3-甲基吡啶甲基)已设计并合成了二氢卟酚e6(2)和6a-,γb-,7c-三(2-三甲基铵乙基)-2-(3-三甲基铵丙-1-烯基)二氢卟酚e(6)(3)他们的DNA结合和-光裂解活性的研究。 DNA展开分析,双链DNA的解链温度测量以及诱导的CD和可见吸收光谱表明,1和3插入双螺旋DNA的碱基对中,而2结合到双螺旋DNA的碱基对中。双螺旋DNA的小沟。阳离子水溶性二氢卟酚e(6)衍生物可在光辐照下有效裂解双螺旋DNA,并且DNA的光裂解活性以3> 1> 2的顺序增加。这三种阳离子的DNA结合和-光裂解特性水溶性二氢卟酚e6衍生物受其分子结构方面的影响,例如阳离子取代基的种类,数量和位置。

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