期刊
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
卷 22, 期 18, 页码 5853-5856出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.bmcl.2012.07.085
关键词
Dipyrrole-polyamide; Synthesis; Cu(II) complex; DNA cleavage
资金
- Program for New Century Excellent Talents in University [NCET-11-0920]
- National Natural Science Foundation of China [21102070]
- Department of Education of Guangdong Province of China
- Opening Project of Key Laboratory of Green Catalysis of Sichuan Institutes of High Education [LYJ11010]
Inspired by the potent DNA-cleaving activity of the Cu(II) complex of monopyrrole-polyamide dimer 1 (i.e., 1@Cu2+), we designed a new dimeric dipyrrole-polyamide analog 2 with the aim to optimize the catalytic activities of the metal complexes of this type of polypyrrole-polyamides. Compound 2 was prepared in 50% yield from the reaction of 1-methyl-4-[(1-methyl-4-nitro-1H-pyrrole-2-carbonyl)-amino]1H-pyrrole-2-carboxylic acid with 2,2'-(ethane-1,2-diylbis(oxy))diethanamine, and fully characterized on the basis of NMR (H-1 and C-13), MS (ESI and HR) and IR. Spectrophotometric titration, ESI-MS and conductivity measurements indicated that compound 2 formed a 1: 1 complex with Cu2+ ion (i.e., 2@Cu2+). Agarose gel electrophoresis studies indicated that 2@Cu2+ was capable of efficiently converting pBR322 DNA into open circular and linear forms under physiological conditions, most probably via an oxidative mechanism. Its overall catalytic activity was estimated to be at least 30-fold higher than that of 1@Cu2+. The fact that the cleaving activities of these Cu(II) complexes parallel, exactly, their binding affinities, raises the possibility that the cleaving activities of polypyrrole-polyamide derivatives of the type can be regulated by the binding affinities. (C) 2012 Elsevier Ltd. All rights reserved.
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