Study of a synthetic human olfactory receptor 17-4: Expression and purification from an inducible mammalian cell line

Brian L. Cook, Karin E. Ernberg, Hyeyoun Chung, Shuguang Zhang

Research output: Contribution to journalArticleResearchpeer-review

40 Citations (Scopus)

Abstract

In order to begin to study the structural and functional mechanisms of olfactory receptors, methods for milligram-scale purification are required. Here we demonstrate the production and expression of a synthetically engineered human olfactory receptor hOR17-4 gene in a stable tetracycline-inducible mammalian cell line (HEK293S). The olfactory receptor gene was fabricated from scratch using PCR-based gene-assembly, which facilitated codon optimization and attachment of a 9-residue bovine rhodopsin affinity tag for detection and purification. Induction of adherent cultures with tetracycline together with sodium butyrate led to hOR17-4 expression levels of ∼ 30 μg per 150 mm tissue culture plate. Fos-choline-based detergents proved highly capable of extracting the receptors, and fos-choline-14 (N-tetradecylphosphocholine) was selected for optimal solubilization and subsequent purification. Analysis by SDS-PAGE revealed both monomeric and dimeric receptor forms, as well as higher MW oligomeric species. A two-step purification method of immunoaffinity and size exclusion chromatography was optimized which enabled 0.13 milligrams of hOR17-4 monomer to be obtained at >90% purity. This high purity of hOR17-4 is not only suitable for secondary structural and functional analyses but also for subsequent crystallization trials. Thus, this system demonstrates the feasibility of purifying milligram quantities of the GPCR membrane protein hOR17-4 for fabrication of olfactory receptor-based bionic sensing device.

Original languageEnglish
Article numbere2920
JournalPLoS One
Volume3
Issue number8
DOIs
Publication statusPublished - 6 Aug 2008
Externally publishedYes

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Odorant Receptors
olfactory receptors
Purification
Cells
cell lines
Cell Line
Genes
choline
Choline
Tetracycline
tetracycline
purity
Bionics
biomimetics
Tissue culture
purification methods
receptors
rhodopsin
Rhodopsin
Butyric Acid

Cite this

Cook, Brian L. ; Ernberg, Karin E. ; Chung, Hyeyoun ; Zhang, Shuguang. / Study of a synthetic human olfactory receptor 17-4 : Expression and purification from an inducible mammalian cell line. In: PLoS One. 2008 ; Vol. 3, No. 8.
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abstract = "In order to begin to study the structural and functional mechanisms of olfactory receptors, methods for milligram-scale purification are required. Here we demonstrate the production and expression of a synthetically engineered human olfactory receptor hOR17-4 gene in a stable tetracycline-inducible mammalian cell line (HEK293S). The olfactory receptor gene was fabricated from scratch using PCR-based gene-assembly, which facilitated codon optimization and attachment of a 9-residue bovine rhodopsin affinity tag for detection and purification. Induction of adherent cultures with tetracycline together with sodium butyrate led to hOR17-4 expression levels of ∼ 30 μg per 150 mm tissue culture plate. Fos-choline-based detergents proved highly capable of extracting the receptors, and fos-choline-14 (N-tetradecylphosphocholine) was selected for optimal solubilization and subsequent purification. Analysis by SDS-PAGE revealed both monomeric and dimeric receptor forms, as well as higher MW oligomeric species. A two-step purification method of immunoaffinity and size exclusion chromatography was optimized which enabled 0.13 milligrams of hOR17-4 monomer to be obtained at >90{\%} purity. This high purity of hOR17-4 is not only suitable for secondary structural and functional analyses but also for subsequent crystallization trials. Thus, this system demonstrates the feasibility of purifying milligram quantities of the GPCR membrane protein hOR17-4 for fabrication of olfactory receptor-based bionic sensing device.",
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Study of a synthetic human olfactory receptor 17-4 : Expression and purification from an inducible mammalian cell line. / Cook, Brian L.; Ernberg, Karin E.; Chung, Hyeyoun; Zhang, Shuguang.

In: PLoS One, Vol. 3, No. 8, e2920, 06.08.2008.

Research output: Contribution to journalArticleResearchpeer-review

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