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• W3102669448 abstract "Abstract Mammalian odorant receptors are a diverse and rapidly evolving set of G protein-coupled receptors expressed in olfactory cilia membranes. Most odorant receptors show little to no cell surface expression in non-olfactory cells due to endoplasmic reticulum retention, which has slowed down biochemical studies. Here, we provide evidence that structural instability and divergence from conserved residues of individual odorant receptors underlie intracellular retention using a combination of large-scale screening of odorant receptors cell surface expression in heterologous cells, point mutations, structural modeling, and machine learning techniques. We demonstrate the importance of conserved residues by synthesizing “consensus” odorant receptors that show high levels of cell surface expression similar to conventional G protein-coupled receptors. Furthermore, we associate in silico structural instability with poor cell surface expression using molecular dynamics simulations. We propose an enhanced evolutionary capacitance of olfactory sensory neurons that enable the functional expression of odorant receptors with cryptic mutations. Significance Statement Odor detection in mammals depends on the largest family of G protein-coupled receptors, the odorant receptors, which represent ∼2% of our protein-coding genes. The vast majority of odorant receptors are trapped within the cell when expressed in non-olfactory cells. The underlying causes of why odorant receptors cannot be functionally expressed in non-olfactory cells have remained enigmatic for over 20 years. Our study points to divergence from a consensus sequence as a key factor in a receptor’s inability to function in non-olfactory cells, which in turn, helps explain odorant receptors’ exceptional functional diversity and rapid evolution. We also show the success of protein engineering strategies for promoting odorant receptor cell surface expression." @default.
• W3102669448 created "2020-11-23" @default.
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• W3102669448 date "2019-04-10" @default.
• W3102669448 modified "2023-10-14" @default.
• W3102669448 title "Structural instability and divergence from conserved residues underlie intracellular retention of mammalian odorant receptors" @default.
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• W3102669448 doi "https://doi.org/10.1101/605337" @default.
• W3102669448 hasPublicationYear "2019" @default.
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