Solution 19F nuclear Overhauser effects in structural studies of the cytoplasmic domain of mammalian rhodopsin

Proceedings of the National Academy of Sciences of the United States of America
Michele C LoewenH Gobind Khorana

Abstract

19F nuclear Overhauser effects (NOEs) between fluorine labels on the cytoplasmic domain of rhodopsin solubilized in detergent micelles are reported. Previously, high-resolution solution (19)F NMR spectra of fluorine-labeled rhodopsin in detergent micelles were described, demonstrating the applicability of this technique to studies of tertiary structure in the cytoplasmic domain. To quantitate tertiary contacts we have applied a transient one-dimensional difference NOE solution (19)F NMR experiment to this system, permitting assessment of proximities between fluorine labels specifically incorporated into different regions of the cytoplasmic face. Three dicysteine substitution mutants (Cys-140-Cys-316, Cys-65-Cys-316, and Cys-139-Cys-251) were labeled by attachment of the trifluoroethylthio group through a disulfide linkage. Each mutant rhodopsin was prepared (8-10 mg) in dodecylmaltoside and analyzed at 20 degrees C by solution (19)F NMR. Distinct chemical shifts were observed for all of the rhodopsin (19)F labels in the dark. An up-field shift of the Cys-316 resonance in the Cys-65-Cys-316 mutant suggests a close proximity between the two residues. When analyzed for (19)F-(19)F NOEs, a moderate negative enhancement was observed...Continue Reading

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Citations

Feb 24, 2007·Journal of Biomolecular NMR·Karla WernerH Gobind Khorana
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