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High-level expression, single-step immunoaffinity purification and characterization of human tetraspanin membrane protein CD81

Takayama, H and Chelikani, P and Reeves, PJ and Zhang, S and Khorana, HG (2008) 'High-level expression, single-step immunoaffinity purification and characterization of human tetraspanin membrane protein CD81.' PLoS ONE, 3 (6). ISSN 1932-6203

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Abstract

The study of membrane protein structure and function requires their high-level expression and purification in fully functional form. We previously used a tetracycline-inducible stable mammalian cell line, HEK2935-TetR, for regulated high level expression of G-protein coupled receptors. We here report successfully using this method for high-level expression of de novo oligo-DNA assembled human CD81 gene. CD81 is a member of the vital tetraspanin membrane protein family. It has recently been identified as the putative receptor for the Hepatitis C Virus envelope E2 glycoprotein (HCV-E2). In this study we used a single-step rho=1D4-affinity purification method to obtain >95% purity from HEK2935-TetR-inducible stable cell lines. Using ELISA assay we determined that the affinity of the purified CD81 receptor for HCV-E2 protein is 3.8±1.2 nM. Using fluorescent confocal microscopy we showed that the inducibly overexpressed CD81 receptor in HEK2935 TetR cells is correctly located on the plasma membrane. We demonstrated that the combination of high-level expression of CD81 with efficient single-step immunoaffinity purification is a useful method for obtaining large quantities of CD81 membrane receptor suitable for detailed structural analyses of this elusive tetraspanin protein. Furthermore, this simple single-step immunoaffinity purification to high purity of membrane protein could be useful broadly for other membrane protein purifications, thus accelerating the determination of structures for large numbers of difficult-to-obtain membrane proteins. © 2008 Takayama et al.

Item Type: Article
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculty of Science and Health > Life Sciences, School of
Depositing User: Jim Jamieson
Date Deposited: 07 Oct 2011 14:16
Last Modified: 09 Sep 2019 08:15
URI: http://repository.essex.ac.uk/id/eprint/931

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