与单氨基/单阳离子对应物相比,正交定位的二氨基/双阳离子聚酰胺 (PA) 具有良好的水溶性和增强的结合亲和力,同时保留了 DNA 小沟和序列特异性。描述了以下二氨基 PA 的合成和 DNA 结合特性:fI P I ( 3a )、fI P P ( 4 )、f -P IP ( 5 ) 和 fP P P ( 6 )。磷表示1-丙基氨基连接到杂环的N1-位的位点。通过 DNase I 足迹、热变性、圆二色滴定、生物传感器表面等离子体共振 (SPR) 和等温滴定量热法 (ITC) 研究评估二氨基 PA 与 DNA 的结合。根据 SPR 研究,与单氨基类似物 f- 相比,fI P I ( 3a ) 结合更强烈 ( K eq = 2.4 × 10 8 M -1 ) 并且与其同源序列 5'-ACGCGT-3' 具有相当的序列选择性IPI ( 1 )。fI P I ( 3a的结合) 到 5'-ACGCGT-3'
Orthogonally Positioned Diamino Pyrrole- and Imidazole-Containing Polyamides: Synthesis of 1-(3-Substituted-propyl)-4-nitropyrrole-2-carboxylic Acid and 1-(3-Chloropropyl)-4-nitroimidazole-2-carboxylic Acid
摘要:
Pyrrole- and imidazole-containing polyamides can be tailored to recognize the DNA 6-8 base pair sequence. We found that adding a second amino group via the N1-position of pyrrole or imidazole in polyamides could enhance their DNA binding affinity and water solubility while retaining sequence specificity. Synthesis of the key 1-substituted-4-nitropyrrole (and imidazole)-2-carboxylic acid building blocks are described. [Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) for the following free supplemental resource(s): Full experimental and spectral details.]
Design, synthesis and DNA binding properties of orthogonally positioned diamino containing polyamide f-IPI
作者:Balaji Babu、Yang Liu、Adam Plaunt、Camille Riddering、Ross Ogilvie、Laura Westrate、Ryan Davis、Amanda Ferguson、Hilary Mackay、Toni Rice、Sameer Chavda、David Wilson、Shicai Lin、Konstantinos Kiakos、John A. Hartley、Moses Lee
DOI:10.1016/j.bbrc.2010.12.073
日期:2011.1
An orthogonally positioned diamino/dicationic polyamide f-IPI 2 was synthesized. It has enhanced binding affinity, and it showed comparable sequence specificity to its monoamino/monocationic counterpart f-IPI 1. Results from CD and DNase I footprinting studies confirmed the minor groove binding and selectivity of polyamides 1 and 2 for the cognate sequence 5'-ACGCGT-3'. SPR studies provided their binding constants: 2.4 x 10(8) M-1 for diamino 2, which is similar to 4 times higher than 5.4 x 10(7) M-1 for its monoamino analogue 1. (C) 2010 Elsevier Inc. All rights reserved.