Olfactory Receptor Proteins: Expression, Characterization and Partial Purification

Uri Gat, Elina Nekrasova, Doron Lancet*, Michael Natochin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


A rat olfactory epithelium cDNA library was screened for olfactory receptor clones. One of the positively hybridizing cDNA clones was sequenced and found to encode a new member of the olfactory receptor superfamily. This cDNA, termed olp4, was used as a model of olfactory receptor for expression, both in vitro and in vivo. Expression of olp4, as well as of another previously cloned olfactory receptor (F5), was monitored by immunoprecipitation with a monoclonal antibody directed against a Flag peptide epitope tag, inserted at the N‐terminus of the open reading frame, and a specific polyclonal antibody against a C‐terminal peptide of olp4. Translation in vitro, followed by immunoprecipitation, showed a major olp4‐specific band of 27–29 kDa. The olp4 and F5 polypeptides were found to be inserted into microsomal membranes as expected for integral membrane proteins. Expression in vivo of Flag‐olp4 in Sf9 insect cells, using the baculovirus expression system, showed a specific polypeptide of the same size as the in vitro species, with an additional band of 34 kDa, which is most likely a glycosylated form. Fluorescence cytometry and immunohistochemical assays demonstrated the localization of the Flag‐olp4 product on the cell surface of the infected host Sf9 cells, with the N‐terminus and C‐terminus in the proper orientation. Affinity chromatography was used for the partial purification of the olp4 polypeptide from infected Sf9 cells. The identification and purification of this expressed olfactory receptor polypeptide could open the way for further characterization and functional studies of the olfactory receptor superfamily members.

Original languageAmerican English
Pages (from-to)1157-1168
Number of pages12
JournalEuropean Journal of Biochemistry
Issue number3
StatePublished - Nov 1994
Externally publishedYes


Dive into the research topics of 'Olfactory Receptor Proteins: Expression, Characterization and Partial Purification'. Together they form a unique fingerprint.

Cite this