Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9573304 | Biophysical Chemistry | 2005 | 7 Pages |
Abstract
Characterization of the interaction between DNA and small organic compounds is of considerable importance for gaining insights into the mechanism underlying molecular recognition, which could be highly relevant to drug design. In the present study, the interaction of a water-soluble cationic porphyrin, 5,10,15,20-tetrakis(N-methylpyridinium-4-yl)-21H,23H-porphyrin, with a self-complementary duplex DNA, d(GCTTAAGC)2, has been investigated by means of absorption, circular dichroism, and NMR spectroscopies. The optical studies indicated that TMPyP binds to the TTAA region of d(GCTTAAGC)2 with a binding constant of 2.5Ã106 Mâ1 and a stoichiometric ratio of 1:1. The observation of intermolecular nuclear Overhauser effect connectivities demonstrated that TMPyP binds in the major groove of d(GCTTAAGC)2. A model for the binding of TMPyP in the major groove of the AT-rich region of d(GCTTAAGC)2 is proposed.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Takako Ohyama, Hajime Mita, Yasuhiko Yamamoto,