4.8 Article

Activity of Single Insect Olfactory Receptors Triggered by Airborne Compounds Recorded in Self-Assembled Tethered Lipid Bilayer Nanoarchitectures

期刊

ACS APPLIED MATERIALS & INTERFACES
卷 15, 期 40, 页码 46655-46667

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsami.3c09304

关键词

bioelectronic nose; lipid bilayer; membraneproteins; ion channels; insect olfaction; Drosophila melanogaster

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Membrane proteins are difficult to study due to their location in the cellular membrane. To overcome this challenge, researchers have developed a model system using a self-assembled lipid bilayer nanoarchitecture. This system allows the measurement of insect olfactory receptors and provides direct evidence for ligand capture and olfactory receptor triggering facilitated by odorant binding proteins.
Membrane proteins are among the most difficult to study as they are embedded in the cellular membrane, a complex and fragile environment with limited experimental accessibility. To study membrane proteins outside of these environments, model systems are required that replicate the fundamental properties of the cellular membrane without its complexity. We show here a self-assembled lipid bilayer nanoarchitecture on a solid support that is stable for several days at room temperature and allows the measurement of insect olfactory receptors at the single-channel level. Using an odorant binding protein, we capture airborne ligands and transfer them to an olfactory receptor from Drosophila melanogaster (OR22a) complex embedded in the lipid membrane, reproducing the complete olfaction process in which a ligand is captured from air and transported across an aqueous reservoir by an odorant binding protein and finally triggers a ligand-gated ion channel embedded in a lipid bilayer, providing direct evidence for ligand capture and olfactory receptor triggering facilitated by odorant binding proteins. This model system presents a significantly more user-friendly and robust platform to exploit the extraordinary sensitivity of insect olfaction for biosensing. At the same time, the platform offers a new opportunity for label-free studies of the olfactory signaling pathways of insects, which still have many unanswered questions.

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