Cooperative interaction between metallosurfactants, derived from the [Ru(2,2′-bpy)3]2+ complex, and DNA

被引:18
|
作者
Lebron, J. A. [1 ]
Ostos, F. J. [1 ]
Moya, M. L. [1 ]
Lopez-Lopez, M. [2 ]
Carrasco, C. J. [3 ]
Lopez-Cornejo, P. [1 ]
机构
[1] Univ Seville, Dept Quim Fis, E-41012 Seville, Spain
[2] Univ Huelva, Fac Ciencias Expt, Dept Ingn Quim Quim Fis & Quim Organ, E-21071 Huelva, Spain
[3] Univ Seville, Fac Quim, Dept Quim Inorgan, ES-41071 Seville, Spain
关键词
DNA; Cooperative mode; Condensation of DNA; Metallosurfactant; Cyclodextrin; RUTHENIUM(II) COMPLEXES; ETHIDIUM-BROMIDE; BINDING; SURFACTANTS; ASSOCIATION; POLYLYSINE; COMPACTION;
D O I
10.1016/j.colsurfb.2015.08.052
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
With the idea of improving and advancing the design and preparation of new reagents based on cationic surfactants for gene therapy, two luminescent metallosurfactants derived from the [Ru(2,2'-bpy)(3)](2+) complex were synthesized. Their interaction with DNA and the effect they exert on the conformation of the polynucleotide were studied by using different techniques. The equilibrium binding constants, K-b, of the two surfactants to DNA were obtained at different molar ratios X= [surfactant]/[DNA]. The observed sigmoidal dependence of K-b on X confirms the cooperative character of the binding. After the addition of a determined surfactant concentration, the condensation of the polymer was observed. The amount of surfactant needed to produce this conformational change is lower for the double stranded surfactant than for the single chain surfactant due to a stronger hydrophobic interaction. The addition of a-cyclodextrin molecules to the metallosurfactant/DNA solutions results in polynucleotide decompaction, which confirms the importance of the hydrophobic interactions in the condensation of the polynucleotide. Results also show the importance of choosing both a proper system to study and the most seeming measuring technique to use. It is demonstrated that, in some cases, the use of several techniques is desirable to obtain reliable and accurate results. (c) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:817 / 824
页数:8
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