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Kawakami M, Juge N, Kato Y, Omote H, Moriyama Y, Miyaji T. Efficient Mass Spectral Analysis of Active Transporters Overexpressed in Escherichia coli. J Proteome Res 2018; 17:1108-1119. [PMID: 29350038 DOI: 10.1021/acs.jproteome.7b00777] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Structural analysis of purified active membrane proteins can be performed by mass spectrometry (MS). However, no large-scale expression systems for active eukaryotic membrane proteins are available. Moreover, because membrane proteins cannot easily be digested by trypsin and ionized, they are difficult to analyze by MS. We developed a method for mass spectral analysis of eukaryotic membrane proteins combined with an overexpression system in Escherichia coli. Vesicular glutamate transporter 2 (VGLUT2/SLC17A6) with a soluble α-helical protein and histidine tag on the N- and C-terminus, respectively, was overexpressed in E. coli, solubilized with detergent, and purified by Ni-NTA affinity chromatography. Proteoliposomes containing VGLUT2 retained glutamate transport activity. For MS analysis, the detergent was removed from purified VGLUT2 by trichloroacetic acid precipitation, and VGLUT2 was then subjected to reductive alkylation and tryptic digestion. The resulting peptides were detected with 88% coverage by matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) MS with or without liquid chromatography. Vesicular excitatory amino acid transporter and vesicular acetylcholine transporter were also detected with similar coverage by the same method. Thus this methodology could be used to analyze purified eukaryotic active transporters. Structural analysis with chemical modifiers by MS could have applications in functional binding analysis for drug discovery.
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Affiliation(s)
- Mamiyo Kawakami
- Department of Molecular Membrane Biology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences , Okayama 700-8530, Japan
| | - Narinobu Juge
- Department of Molecular Membrane Biology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences , Okayama 700-8530, Japan.,Advanced Science Research Center, Okayama University , Okayama 700-8530, Japan.,Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency , Kawaguchi 332-0012, Japan
| | - Yuri Kato
- Advanced Science Research Center, Okayama University , Okayama 700-8530, Japan
| | - Hiroshi Omote
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences , Okayama 700-8530, Japan
| | - Yoshinori Moriyama
- Department of Membrane Biochemistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences , Okayama 700-8530, Japan
| | - Takaaki Miyaji
- Department of Molecular Membrane Biology, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences , Okayama 700-8530, Japan.,Advanced Science Research Center, Okayama University , Okayama 700-8530, Japan
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Qiao L, Lee KJ, Ko K. Characterization of the Glycan Structures of Glycoprotein GA733-Fc Expressed in a Baculovirus-Insect Cell System. B KOREAN CHEM SOC 2015. [DOI: 10.1002/bkcs.10035] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Lu Qiao
- Department of Medicine, Therapeutic Protein Engineering Lab, College of Medicine; Chung-Ang University; Seoul 156-756 Korea
| | - Kyung Jin Lee
- Department of Medicine, Therapeutic Protein Engineering Lab, College of Medicine; Chung-Ang University; Seoul 156-756 Korea
| | - Kisung Ko
- Department of Medicine, Therapeutic Protein Engineering Lab, College of Medicine; Chung-Ang University; Seoul 156-756 Korea
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Debailleul F, Trubbia C, Frederickx N, Lauwers E, Merhi A, Ruysschaert JM, André B, Govaerts C. Nitrogen catabolite repressible GAP1 promoter, a new tool for efficient recombinant protein production in S. cerevisiae. Microb Cell Fact 2013; 12:129. [PMID: 24369062 PMCID: PMC3880969 DOI: 10.1186/1475-2859-12-129] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2013] [Accepted: 12/18/2013] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Decades of work requiring heterologous expression of eukaryotic proteins have shown that no expression system can be considered as the panacea and the appropriate expression strategy is often protein-dependent. In a large number of cases, yeasts have proven to be reliable organisms for heterologous protein expression by combining eukaryotic cellular organization with the ease of use of simpler microorganisms. RESULTS During this work, a novel promoter system based on the nitrogen catabolite regulation has been developed to produce the general amino acid permease (Gap1) in its natural host, the yeast Saccharomyces cerevisiae. A simple purification protocol was also established that allows to purify milligrams of Gap1 from cells cultivated in a five liters bio-reactor. In order to test the ability of the system to be used for expression of other proteins, the yeast specific transporter of γ-aminobutyric acid (Uga4), a human vesicular transporter of glutamate (Vglut1) and a small secreted glycoprotein (MD-2) were also expressed using the nitrogen catabolite regulation. All proteins were fused to GFP and their presence and localization were confirmed by western blot analysis and fluorescence microscopy. CONCLUSIONS Our work shows that the nitrogen catabolite repressible GAP1 promoter can be used to obtain high levels of recombinant protein while allowing for large biomass production in S. cerevisiae. This approach can be used to express membrane and soluble proteins from higher eukaryotes (from yeast to human). Therefore, this system stands as a promising alternative to commonly used expression procedure in yeasts.
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Affiliation(s)
- Fabien Debailleul
- S.F.M.B., Université Libre de Bruxelles, Blvd. du Triomphe, Bâtiment BC, local 1C4.208, B-1050 Bruxelles, Belgium
| | - Cataldo Trubbia
- S.F.M.B., Université Libre de Bruxelles, Blvd. du Triomphe, Bâtiment BC, local 1C4.208, B-1050 Bruxelles, Belgium
| | - Nancy Frederickx
- S.F.M.B., Université Libre de Bruxelles, Blvd. du Triomphe, Bâtiment BC, local 1C4.208, B-1050 Bruxelles, Belgium
| | - Elsa Lauwers
- Lab Physiologie Moléculaire de la Cellule, Université Libre de Bruxelles, IBMM, rue des Pr. Jeener et Brachet, 12, 6041 Gosselies, Belgium
| | - Ahmad Merhi
- Lab Physiologie Moléculaire de la Cellule, Université Libre de Bruxelles, IBMM, rue des Pr. Jeener et Brachet, 12, 6041 Gosselies, Belgium
| | - Jean-Marie Ruysschaert
- S.F.M.B., Université Libre de Bruxelles, Blvd. du Triomphe, Bâtiment BC, local 1C4.208, B-1050 Bruxelles, Belgium
| | - Bruno André
- Lab Physiologie Moléculaire de la Cellule, Université Libre de Bruxelles, IBMM, rue des Pr. Jeener et Brachet, 12, 6041 Gosselies, Belgium
| | - Cédric Govaerts
- S.F.M.B., Université Libre de Bruxelles, Blvd. du Triomphe, Bâtiment BC, local 1C4.208, B-1050 Bruxelles, Belgium
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Liguz-Lecznar M, Skangiel-Kramska J. Vesicular glutamate transporters VGLUT1 and VGLUT2 in the developing mouse barrel cortex. Int J Dev Neurosci 2007; 25:107-14. [PMID: 17289331 DOI: 10.1016/j.ijdevneu.2006.12.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2006] [Revised: 12/18/2006] [Accepted: 12/19/2006] [Indexed: 10/23/2022] Open
Abstract
Three vesicular glutamate transporters have been identified in mammals. Two of them, VGLUT1 and VGLUT2, define the glutamatergic phenotype and their distribution in the brain is almost complementary. In the present study we examined the distribution and expression levels of these two VGLUTs during postnatal development of the mouse barrel cortex. We also investigated changes in the localization of VGLUT1 and VGLUT2 within particular compartments of the barrel field (barrels/septa) during its development. We found differences in the time course of developmental expression, with VGLUT1 peaking around P14, while VGLUT2 increased gradually until adulthood. Over the examined period (P3 - adult) both transporters had stronger expression in the barrel interiors, and in this compartment VGLUT2 dominated, whereas in the inter-barrel septa VGLUT1 dominated over VGLUT2. Furthermore, we found that some nerve terminals in the barrel cortex coexpressed both transporters until adulthood. Colocalization was observed within the barrels, but not within the septa.
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Affiliation(s)
- M Liguz-Lecznar
- Laboratory of Molecular Basis of Brain Plasticity, Department of Molecular and Cellular Neurobiology, Nencki Institute of Experimental Biology, 3 Pasteur St., 02-093 Warsaw, Poland
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Raunser S, Haase W, Bostina M, Parcej DN, Kühlbrandt W. High-yield expression, reconstitution and structure of the recombinant, fully functional glutamate transporter GLT-1 from Rattus norvegicus. J Mol Biol 2005; 351:598-613. [PMID: 16024041 DOI: 10.1016/j.jmb.2005.06.036] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2005] [Revised: 06/14/2005] [Accepted: 06/15/2005] [Indexed: 10/25/2022]
Abstract
The glutamate transporter GLT-1 from Rattus norvegicus was expressed at high level in BHK cells using the Semliki Forest virus expression system. BHK cells infected with viral particles carrying the GLT-1 gene exhibited 30-fold increased aspartate uptake compared to control cells. The expression level of GLT-1 as determined by binding of labelled substrate to membrane preparations was about 3.5 x 10(6) functional transporters per cell, or 61 pmol GLT-1 per milligram of membrane protein. Purification of the His-tagged protein by Ni2+-NTA affinity chromatography enabled the routine production and purification of milligram quantities of fully functional transporter. Transport activity required reducing conditions and the addition of extra lipid throughout the purification. The apparent molecular mass of the recombinant transporter was 73 kDa or 55 kDa, corresponding to the glycosylated and non-glycosylated form, respectively. Both forms were active upon separation on a lectin column and reconstitution into liposomes. Glycosylated and non-glycosylated GLT-1 were transported to the plasma membrane with equal efficiency. Our results show that N-glycosylation does not affect the trafficking or the transport activity of GLT-1. The low-resolution structure of GLT-1 was determined by electron microscopy and single particle reconstruction.
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Affiliation(s)
- Stefan Raunser
- Department of Structural Biology, Max-Planck-Institute of Biophysics, 60439 Frankfurt am Main, Germany
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