1. Institute of Biochemical Analysis, Xinzhou Teachers University, Xinzhou 034000, China 2. College of Light Industry and Food Science, South China University of Technology, Guangzhou 510640, China
Abstract：The interaction of two kinds of sulfated chitosans with DNA was investigated using fluorescence spectra，absorption spectra, alkaline denaturation curves, ionic strength, fluorescence quenching etc. The results showed that there were two modes of the interaction between sulfated chitosans and DNA/ ethidium bromide(EB): intercalative and electrostatic binding. Hyperchromic and bathochromic effects in the absorption spectra were observed when sulfated chitosans with a low degree of substitution (CT-L) or a high degree of substitution (CT-L) were bound to herring sperm DNA. The stability of DNA/EB was increased with the increase in alkaline denaturation pH in the presence of CT-H and CT-L. Meanwhile, a weak interaction of cationic Mg2+ and phosphate groups of DNA by electrostatic force binding was observed. The fluorescence was efficiently quenched in the presence of a micro-amounts of sulfated chitosans, which confirmed that there was a strong competitive binding interaction among EB, CT-H or CT-L and DNA. All of these demonstrated that different sulfated chitosans can be used as a type of hopeful target-pointed molecule of gene therapy.
张海容1,2,郭祀远2,李琳2,蔡妙颜2,郑必胜2 . 光谱法研究硫酸酯化壳聚糖与DNA的作用机理[J]. 光谱学与光谱分析, 2007, 27(11): 2294-2298.
ZHANG Hai-rong1,2,GUO Si-yuan2,LI Lin2,CAI Miao-yan2,ZHENG Bi-sheng2 . Study on the Binding Mode of Sulfated Chitosans with Nucleic Acids Using Spectral Analysis. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(11): 2294-2298.
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