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JM Nerbonne, RE Sheridan, LD Chabala and HA Lester
The cis and trans isomers of the photoisomerizable compound, 3,3'-bis- [alpha-(trimethylammonium)methyl]azobenzene (Bis-Q), were purified by high-performance liquid chromatography using the ion-pair partitioning technique on a reverse-phase column. Solutions of cis-Bis-Q are stable at -20 degrees; at 25 degrees, thermal isomerization proceeds at a rate of 0.65%/day. cis-Bis-Q is less than 1% as potent a nicotinic agonist as the trans configuration. At concentrations of 1.5 microM or less, cis-Bis-Q exerts little or no blockade of the conductances induced by agonists. In voltage-clamped Electrophorus electroplaques exposed to cis-Bis-Q, laser flashes induce cis leads to trans photoisomerizations and increase the agonist-induced current by a factor of 20 within a few milliseconds.
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D. S. Dahan, M. I. Dibas, E. J. Petersson, V. C. Auyeung, B. Chanda, F. Bezanilla, D. A. Dougherty, and H. A. Lester A fluorophore attached to nicotinic acetylcholine receptor {beta}M2 detects productive binding of agonist to the {alpha}{delta} site PNAS, July 6, 2004; 101(27): 10195 - 10200. [Abstract] [Full Text] [PDF] |
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