کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1932143 1050573 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Selective binding of tumor suppressor p53 protein to topologically constrained DNA: Modulation by intercalative drugs
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Selective binding of tumor suppressor p53 protein to topologically constrained DNA: Modulation by intercalative drugs
چکیده انگلیسی

Selective binding of the wild type tumor suppressor protein p53 to negatively and positively supercoiled (sc) DNA was studied using intercalative drugs chloroquine (CQ), ethidium bromide, acridine derivatives and doxorubicin as a modulators of the level of DNA supercoiling. The p53 was found to lose gradually its preferential binding to negatively scDNA with increasing concentrations of intercalators until the DNA negative superhelix turns were relaxed. Formation of positive superhelices (due to further increasing intercalator concentrations) rendered the circular duplex DNA to be preferentially bound by the p53 again. CQ at concentrations modulating the closed circular DNA topology did not prevent the p53 from recognizing a specific target sequence within topologically unconstrained linear DNA. Experiments with DNA topoisomer distributions differing in their superhelix densities revealed the p53 to bind selectively DNA molecules possessing higher number of negative or positive superturns. Possible modes of the p53 binding to the negatively or positively supercoiled DNA and tentative biological consequences are discussed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical and Biophysical Research Communications - Volume 393, Issue 4, 19 March 2010, Pages 894–899
نویسندگان
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