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|a Khorana, H. Gobind
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|a Massachusetts Institute of Technology. Center for Biomedical Engineering
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|a Massachusetts Institute of Technology. Department of Biology
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|a Massachusetts Institute of Technology. Department of Chemistry
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|a Khorana, H. Gobind
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|a Khorana, H. Gobind
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|a Zhang, Shuguang
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|a Chelikani, Prashen
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|a Takayama, Hidehito
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|a Zhang, Shuguang
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|a Chelikani, Prashen
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|a Takayama, Hidehito
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|a Reeves, Philip J.
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|a High-Level Expression, Single-Step Immunoaffinity Purification and Characterization of Human Tetraspanin Membrane Protein CD81
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|b Public Library of Science,
|c 2010-06-02T15:45:37Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/55362
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|a 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, HEK293S-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 HEK293S-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 HEK293S-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.
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|a en_US
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|a Article
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|t PLoS ONE
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