Extending the Language of DNA Molecular Recognition by Polyamides: Unexpected Influence of Imidazole and Pyrrole Arrangement on Binding Affinity and Specificity
作者:Karen L. Buchmueller、Andrew M. Staples、Cameron M. Howard、Sarah M. Horick、Peter B. Uthe、N. Minh Le、Kari K. Cox、Binh Nguyen、Kimberly A. O. Pacheco、W. David Wilson、Moses Lee
DOI:10.1021/ja044359p
日期:2005.1.1
Pyrrole (Py) and imidazole (Im) polyamides can be designed to target specific DNA sequences. The effect that the pyrrole and imidazole arrangement, plus DNA sequence, have on sequence specificity and binding affinity has been investigated using DNA melting (DeltaT(M)), circular dichroism (CD), and surface plasmon resonance (SPR) studies. SPR results obtained from a complete set of triheterocyclic polyamides
可以设计吡咯 (Py) 和咪唑 (Im) 聚酰胺以靶向特定的 DNA 序列。已使用 DNA 熔解 (DeltaT(M))、圆二色性 (CD) 和表面等离子体共振 (SPR) 研究了吡咯和咪唑排列以及 DNA 序列对序列特异性和结合亲和力的影响。从一套完整的三杂环聚酰胺获得的 SPR 结果显示 f-ImPyIm 对其同源 DNA 的亲和力存在显着差异(K(eq) = 1.9 x 10(8) M(-1)) 和 f-PyPyIm 对其同源 DNA 的亲和力DNA (K(eq) = 5.9 x 10(5) M(-1)),在对这些化合物进行表征之前是无法预料的。此外,f-ImPyIm 对 CGCG 的亲和力是远霉素 A 对其同源物 AATT 的 10 倍。为了理解这种差异,三酰胺二聚体分为两个结构组:中央和终端配对。四个可能的中心配对显示出对其各自同源序列的选择性和亲和力降低:-ImPy > -PyPy-