کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1173901 961710 2010 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A label-free assay of exonuclease activity using a pyrosequencing technique
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
A label-free assay of exonuclease activity using a pyrosequencing technique
چکیده انگلیسی

Enzymes with 3′–5′ exonuclease activities are important in promoting the accuracy of DNA replication and DNA repair by proofreading. The alteration of the function of these enzymes by endogenous or exogenous effectors could, therefore, have a considerable impact on DNA replication and ultimately on genome integrity. We have developed a label-free high-throughput screening method for quantifying the effects of different reagents on exonuclease activity. The assay is based on a hairpin-forming biotinylated oligonucleotide substrate that contains one or more exonuclease-resistant phosphorothioate nucleotides. The activity and specificity of the selected 3′–5′ exonuclease is determined indirectly using a sensitive pyrosequencing reaction after cleanup of the samples. In this pyrosequencing step, the amount of nucleotides filled into each position of the exonucleolytically degraded 3′ end of the substrate can be recorded quantitatively and equals the amount of the nucleotides removed by the exonuclease. This system allows the estimation of both processivity and efficiency of the exonuclease activity. We have employed compounds reported in the literature to inhibit the exonuclease activities of either exonuclease III or the large fragment of polymerase I (Klenow fragment) to evaluate the assay.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytical Biochemistry - Volume 405, Issue 1, 1 October 2010, Pages 11–18
نویسندگان
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