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Olfactory Receptors: Location and Structure01:03

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The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
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Signal sequences are short amino acid sequences that guide newly synthesized proteins to their proper location within the cell. Classical signal sequences are fifteen to sixty amino acids long and present at the N-terminus of a polypeptide chain. Each signal sequence has a conserved segment of basic residues towards their N terminus, a hydrophobic core, and a C-terminus rich in polar residues. The C-terminus also contains a signal cleavage site and features a -3 -1 sequence motif. The -3-1...
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Updated: Oct 5, 2025

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Sequence coevolution and structure stabilization modulate olfactory receptor expression.

Soumadwip Ghosh1, Claire A de March2, Sergio Branciamore1

  • 1Department of Computational and Quantitative Medicine, Beckman Research Institute of the City of Hope, Duarte, CA, USA.

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Summary
This summary is machine-generated.

Researchers enhanced the expression of olfactory receptors (ORs) using computational methods. This breakthrough enables protein purification for structural studies and odorant-receptor interaction research.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • Olfactory receptors (ORs) are Class A G-protein coupled receptors (GPCRs) activated by odorants.
  • No three-dimensional structure of an OR is currently available due to poor expression in heterologous systems.
  • Poor protein expression is a major bottleneck for OR structural and functional studies.

Purpose of the Study:

  • To design and generate human OR mutants with enhanced heterologous expression.
  • To enable protein purification for structural and biochemical studies of ORs.
  • To facilitate high-throughput deorphanization and understanding of odorant-OR interactions.

Main Methods:

  • Identified computable physical properties that predict OR and Class A GPCR expression.
  • Employed an iterative computational prediction-experimental testing cycle.
  • Focused on mutations in intracellular loop 1 (ICL1) and helix 8, and allosteric mutations.

Main Results:

  • Generated human OR mutants exhibiting expression levels comparable to successfully solved GPCR structures.
  • Identified key properties like amino acid coevolution and ICL1-helix 8 interaction strength for enhancing expression.
  • Mutants demonstrated functional responses to known odorants.

Conclusions:

  • Developed a computational method to significantly enhance heterologous expression of mammalian ORs.
  • This method will accelerate OR purification for structural and biochemical analyses.
  • Facilitates understanding of odorant-OR interactions and high-throughput OR deorphanization.