Complex-Formation of Ethidium Bromide with Poly[d(A-T)]·Poly[d(A-T)]

Complex-Formation of Ethidium Bromide with Poly[d(A-T)]·Poly[d(A-T)]
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溴化乙锭与聚[d(A-T)]·聚[d(A-T)]的络合

DOI:
10.1080/07391102.2005.10507017
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发表时间:
2005
影响因子:
4.4
通讯作者:
A. T. Karapetian
A. T. Karapetian
中科院分区:
生物学3区
文献类型:
--
作者:
P. O. Vardevanyan;A. Antonyan;M. Parsadanyan;H. Davtyan;Zaruhi R Boyajyan;A. T. Karapetian

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摘要研究了溴化乙锭(EtBr)在不同离子强度溶液中与双链(ds-)和单链(ss-)聚[d(A-T)]的相互作用。光学光谱和Scatchard分析结果表明,配体以“强”和“弱”的结合模式与多核苷酸的螺旋和螺旋结构相互作用。发现强相互作用类型的结合参数(结合常数k和与结合位点n对应的核苷酸数量)与Na+浓度无关。弱相互作用发生在低离子强度和/或高EtBr浓度。估计的EtBr与ss-和ds-多核苷酸的结合参数与EtBr- b - dna复合物的结合参数一致。获得的数据为EtBr与单链聚[d(a - t)]的堆叠相互作用提供了证据。
Abstract The interaction of Ethidium Bromide (EtBr) with double-stranded (ds-) and single-stranded (ss-) poly[d(A-T)] was studied in different ionic strengths solutions. Optical spectroscopy and Scatchard analysis results indicate that the ligand interacts to both helix and coiled structures of the polynucleotide by “strong” and “weak” binding modes. The association parameters (binding constant—K—and the number of nucleotides corresponding to a binding site—n) of the strong type of interaction were found to be independent of Na+ concentration. Weak interaction occurs at low ionic strength and/or high EtBr concentration. Estimated binding parameters of EtBr with ss- and ds-polynucleotide are in good agreement with those for EtBr-B-DNA complexes. Data obtained provided an evidence for a stacking interaction of EtBr with single stranded poly[d(A-T)].
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DOI: 10.1080/07391102.1991.10507875
发表时间: 1991
影响因子: 4.4
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通讯作者: Wilson,WD
DOI: 10.1073/pnas.84.24.8922
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DOI: --
发表时间: 1989
期刊: The Journal of biological chemistry
影响因子: --
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