Efficient Plasmid DNA Cleavage by Copper(II) Complexes of 1,4,7-Triazacyclononane Ligands Featuring Xylyl-Linked Guanidinium Groups
作者:Linda Tjioe、Anja Meininger、Tanmaya Joshi、Leone Spiccia、Bim Graham
DOI:10.1021/ic102301n
日期:2011.5.16
s–1 for cleavage of form II DNA to form III was also able to be determined. The X-ray crystal structures of the copper(II) complexes of L1 and L3 show that the distorted square-pyramidal copper(II) coordination sphere is occupied by three nitrogen atoms from the tacn ring and two chloride ions. In both complexes, the protonated guanidinium pendants extend away from the metal and form hydrogen bonds
三个新的金属配位配体,大号1,大号2,和大号3,已经通过附加制备ø - ,米,以及- p分别-xylylguanidine吊坠,以1,4,7-三氮杂环的氮原子中的一个(tacn)。这些配体的铜(II)配合物能够加速模型磷酸二酯双(对硝基苯基)磷酸酯(BNPP)和[2-(羟丙基)-对硝基苯基]磷酸酯(HPNPP)内的PO键断裂。以及超螺旋pBR 322质粒DNA。它们对BNPP和HPNPP的反应性与非胍基化类似物[Cu(tacn)(OH)2)2 ] 2+和[Cu(1-苄基-tacn)(OH 2)2 ] 2+,但是它们切割质粒DNA的速率比这两种复合物中的任何一种都快得多。L 1的复合物[[Cu(L 1 H +)(OH 2)2 ] 3+)是该系列中最活跃的复合物,可将超螺旋质粒DNA(形式I)切割为松弛的环状形式(形式II), a k obs值为(2.7±0.3)×10 –4 s –1,与[C