کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1935092 1050658 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dynamics of an anti-VEGF DNA aptamer: A single-molecule study
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Dynamics of an anti-VEGF DNA aptamer: A single-molecule study
چکیده انگلیسی

Single-molecule fluorescence resonance energy transfer (SMFRET) was used to study the interaction of a 25-nucleotide (nt) DNA aptamer with its binding target, vascular endothelial growth factor (VEGF). Conformational dynamics of the aptamer were studied in the absence of VEGF in order to characterize fluctuations in the unbound nucleic acid. SMFRET efficiency distributions showed that, while the aptamer favors a base-paired conformation, there are frequent conversions to higher energy conformations. Conversions to higher energy structures were also demonstrated to be dependent on the concentration of Mg2+-counterion by an overall broadening of the SMFRET efficiency distribution at lower Mg2+ concentration. Introduction of VEGF caused a distinct increase in the frequency of lower SMFRET efficiencies, indicating that favorable interaction of the DNA aptamer with its VEGF target directs aptamer structure towards a more open conformation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical and Biophysical Research Communications - Volume 373, Issue 2, 22 August 2008, Pages 213–218
نویسندگان
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