1. FTIR analysis of GPCR activation using azido probes
- Author
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Shixin Ye, Thomas P. Sakmar, Thomas Huber, and Reiner Vogel
- Subjects
Azides ,Rhodopsin ,Stereochemistry ,Phenylalanine ,viruses ,Static Electricity ,Article ,Receptors, G-Protein-Coupled ,Spectroscopy, Fourier Transform Infrared ,Static electricity ,Fourier transform infrared spectroscopy ,Spectroscopy ,Molecular Biology ,G protein-coupled receptor ,chemistry.chemical_classification ,biology ,Chemistry ,Electron Spin Resonance Spectroscopy ,Cell Biology ,biochemical phenomena, metabolism, and nutrition ,Stop codon ,Amino acid ,Models, Structural ,Molecular Probes ,biology.protein ,Molecular probe - Abstract
We demonstrate the site-directed incorporation of an IR-active amino acid, p-azido-L-phenylalanine (azidoF, 1), into the G protein-coupled receptor rhodopsin using amber codon suppression technology. The antisymmetric stretch vibration of the azido group absorbs at approximately 2,100 cm(-1) in a clear spectral window and is sensitive to its electrostatic environment. We used FTIR difference spectroscopy to monitor the azido probe and show that the electrostatic environments of specific interhelical networks change during receptor activation.
- Published
- 2009
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