Abstract
We report here the results of human olfactory receptor (OR) 17-40 stimulation with some odorants probed by means of the double-channel surface plasmon resonance platform NanoSPR-6. OR 17-40 tagged with N-terminal cmyc sequence was heterologously co-expressed with Gαolf protein in yeast, and receptor-carrying nanosomes were prepared from yeast membrane fraction. Then, receptors were specifically captured via anti-cmyc antibody attached to the gold-coated substrate in orientated or random way. Measurement of odorants effects were carried out in the presence of GTP-γ-S in differential mode in order to compensate bulk changes of refractive index. For the first time, biosensing efficiency of olfactory films was discussed in terms of their thickness and Gαolf accessibility to GTP-γ-S. Bell-shaped response profile with two maxima (near 1 nM and near 1 μM) was established for helional, which is documented as highly specific agonist of OR 17-40. Unrelated odorant heptanal used as control, did not evoke significant variations of differential signal.
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Abbreviations
- GPCRs:
-
G protein-coupled receptors
- ORs:
-
Olfactory receptors
- SAM:
-
Self-assembled monolayer
- SPR:
-
Surface plasmon resonance
- PBS:
-
Phosphate-buffered saline
- AFM:
-
Atomic force microscopy
- CV:
-
Cyclic voltammetry
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Acknowledgments
Vladimir I. Chegel appreciates financial support from NATO CLG grant PDD (CP)-(CBP.NUKR.CLG981776). Irina Benilova was supported by EGIDE (France) through the doctoral Bourse Eiffel.
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Benilova, I., Chegel, V.I., Ushenin, Y.V. et al. Stimulation of human olfactory receptor 17-40 with odorants probed by surface plasmon resonance. Eur Biophys J 37, 807–814 (2008). https://doi.org/10.1007/s00249-008-0272-5
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DOI: https://doi.org/10.1007/s00249-008-0272-5