Questo lavoro è stato supportato da un trattamento di HIV Ontario sovvenzione di funzionamento Research Network (ROG-G645) e la Canadian Institutes of Research Investigator Award Salute New (MSH-113554) per JEL, borse di studio e Università di Toronto per HA, FCA, e JDC. Gli autori desiderano ringraziare Marnie Fusco, Dafna Abelson e il Dott. Erica Ollmann Saphire at The Scripps Research Institute (La Jolla, CA) per le cellule che forniscono, le ebolavirus vettore di espressione GP e consigli generali.

<ol>
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M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Production+of+recombinant+protein+therapeutics+in+cultivated+mammalian+cells.">Production of recombinant protein therapeutics in cultivated mammalian cells.</a> Nat Biotechnol. 22, 1393-1398 (2004).</li><li>Lee, J. E., Fusco, M. H., Hessell, A. J., Burton, D. R., Saphire, E. O. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Techniques+and+tactics+used+in+determining+the+structure+of+trimeric,+prefusion+Ebola+virus+GP.">Techniques and tactics used in determining the structure of trimeric, prefusion Ebola virus GP.</a> Acta Cryst. 65, 1162-1180 (2009).</li><li>Aricescu, A. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Eukaryotic+expression:+developments+for+structural+proteomics.">Eukaryotic expression: developments for structural proteomics.</a> Acta. Crystallogr. D Biol. Crystallogr. 62, 1114-1124 (2006).</li><li>Aricescu, A. R., Lu, W., Jones, E. Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+time-+and+cost-efficient+system+for+high-level+protein+production+in+mammalian+cells.">A time- and cost-efficient system for high-level protein production in mammalian cells.</a> Acta. Crystallogr. D Biol. Crystallogr. D62, 1243-1250 (2006).</li><li>Chang, V. 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C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Structure+of+the+quaternary+complex+of+interleukin-2+with+its+alpha,+beta,+and+gammac+receptors.">Structure of the quaternary complex of interleukin-2 with its alpha, beta, and gammac receptors.</a> Science. 310, 1159-1163 (2005).</li></ol>

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Il 10-strato fabbriche di cellule sono una nave efficace per la produzione di quantità di milligrammi di proteina. Uno dei principali vantaggi di utilizzare la fabbrica della cellula rispetto ad altre imbarcazioni tradizionali, quali bottiglie, flaconi a rulli scuotere o filatore boccette, è che non richiedono l&#39;acquisto di eventuali attrezzature di laboratorio supplementare. Uno standard di CO 2 incubatore (circa 6.0 cu. Ft) sarà comodamente ospitare quattro 10-layer fabbriche di cellule (Fig....

<table border="1"><tbody><tr><td> Nome di reagente </td><td> Azienda </td><td> Numero di catalogo </td><td> Comments </td></tr><tr><td> Fosfatasi alcalina (BCIP / NBT) soluzione di substrato liquido </td><td> Sigma </td><td> B6404 </td><td></td></tr><tr><td> Antibiotica / antimicotica, 100X </td><td> Invitrogen </td><td> 15240062 </td><td></td></tr><tr><td> Anti-HA affinità matrice, clone 3F10 </td><td> Roche </td><td> 1815016 </td><td></td></tr><tr><td> Anti-HA mAb murino, clone 16B12 </td><td> Covance </td><td> MMS-101P </td><td></td></tr><tr><td> Pallone cultura cellulare, T75 2 cm coltura tessuto trattato </td><td> Corning </td><td> 430641 </td><td></td></tr><tr><td> Pallone cultura cellulare, T225 2 cm coltura tessuto trattato </td><td> Corning </td><td> 431082 </td><td></td></tr><tr><td>Piastre di coltura cellulare ,6-cultura e tessuto trattato </td><td> Corning </td><td> 3516 </td><td></td></tr><tr><td> Fabbrica della cellula, 10-layer CellSTACK </td><td> Corning </td><td> 3312 </td><td></td></tr><tr><td> Centramate Omega 5K Cassette </td><td> Coltre </td><td> OS005C12 </td><td></td></tr><tr><td> Centramate Omega 30K Cassette </td><td> Coltre </td><td> OS030C12 </td><td></td></tr><tr><td> Cromatografia su colonna in vetro, cm 1.0x10 </td><td> Kontes </td><td> 4204001010 </td><td></td></tr><tr><td> Ciprofloxacina </td><td> Sigma </td><td> 17850 </td><td></td></tr><tr><td> CO 2 </td><td></td><td></td><td></td></tr><tr><td> Eagle modificato da Dulbecco di supporto (DMEM) </td><td> Sigma </td><td> D5796 </td><td></td></tr><tr><td> Siero bovino fetale (FBS), inattivato a caldo </td><td> Invitrogen </td><td> 12484-028 </td><td></td></tr><tr><td> Fugene HD reagenti di trasfezione </td><td> Promega </td><td> 4709691001 </td><td></td></tr><tr><td> GeneJuice reagenti di trasfezione </td><td> EMD / Merck </td><td> 70967-6 </td><td></td></tr><tr><td> Glycine </td><td> Sigma </td><td> G8898 </td><td></td></tr><tr><td> Capra anti-topo IgG F (ab &#39;) 2 alcalina </td><td> Thermo Scientific </td><td> 31324 </td><td></td></tr><tr><td> fosfatasi-coniugato anticorpo </td><td></td><td></td><td></td></tr><tr><td> Emoagglutinina (HA) peptide, 100 mg </td><td> GenScript </td><td> sintesi personalizzata </td><td></td></tr><tr><td> (Sequenza: YPYDVPDYA, il 95% di purezza) </td><td></td><td></td><td></td></tr><tr><td> HEK 293T </td><td> ATCC </td><td> CRL-11268 </td><td></td></tr><tr><td> Household candeggina (4% w / v di ipoclorito di sodio) </td><td> Sono disponibili varie marche </td><td></td><td></td></tr><tr><td> Immobilon-P membrana PVDF </td><td> Millipore </td><td> IPVH07850 </td><td></td></tr><tr><td> Miniprep Kit purificazione plasmide, PureLink rapida </td><td> Invitrogen </td><td> K2100-11 </td><td></td></tr><tr><td> MaxiPrep kit di purificazione plasmide, PureLink HiPure </td><td> Invitrogen </td><td> K2100-07 </td><td></td></tr><tr><td> NaN 3 </td><td> Sigma </td><td> S8032 </td><td></td></tr><tr><td> pDISPLAY vettore di espressione </td><td> Invitrogen </td><td> V660-20 </td><td></td></tr><tr><td> Penicillina / streptomicina (pen / strep), 100X </td><td> Invitrogen </td><td> 15140-122 </td><td></td></tr><tr><td> Tampone fosfato salino (PBS), sterile 1X </td><td> Sigma </td><td> D8537 </td><td></td></tr><tr><td> Polietilenimmina (PEI), lineari 25 kDa </td><td> Polyscience </td><td> 23966 </td><td></td></tr><tr><td> Il latte scremato in polvere secca </td><td> Garofano </td><td></td><td></td></tr><tr><td> Stericup-GP PES vuoto unità di filtrazione, </td><td> Millipore </td><td> SCGPU05RE </td><td></td></tr><tr><td> 0,22 micron, 500 ml </td><td></td><td></td><td></td></tr><tr><td> Trypan blu </td><td> Invitrogen </td><td> 15250061 </td><td></td></tr><tr><td> Tripsina-EDTA, 0,05% (w / v) </td><td> Invitrogen </td><td> 25300-054 </td><td></td></tr><tr><td> Tween-20 </td><td> Sigma </td><td> P7949 </td><td></td></tr><tr><td> L&#39;acido valproico </td><td> Sigma </td><td> P4543 </td><td></td></tr><tr><td> Centramate sistema a flusso tangenziale </td><td> Coltre </td><td></td><td></td></tr><tr><td> CO 2 incubatore umidificato, standard 6.0 cu. ft </td><td> Sono disponibili varie marche </td><td></td><td></td></tr><tr><td> Elettroforesi e trasferimento unità </td><td> Sono disponibili varie marche </td><td></td><td></td></tr><tr><td> Incubatore, 37 ° C </td><td> Sono disponibili varie marche </td><td></td><td></td></tr></tbody></table>

a convenient and general expression platform for the production of secreted proteins from human cells

Ricombinante espressione della proteina in batteri, tipicamente E. coli, è stato la strategia più efficace per l&#39;espressione quantità milligrammo di proteine. Tuttavia, ospiti procariotici spesso non sono appropriati per l&#39;espressione di proteine ​​virali umani, o eucariotica a causa della tossicità della macromolecola estera, le differenze nei macchinari ripiegamento proteico, oppure a causa della mancanza di particolari modifiche co-o post-traduzionale di batteri. Sistemi di espressione basati sul lievito (P. pastoris o S. cerevisiae) 1,2, baculovirus-insetto infetto (S. frugiperda o T. ni) 3 celle, e privo di cellule in vitro sistemi di traduzione 2,4 sono stati utilizzati con successo per produrre proteine ​​di mammifero. Intuitivamente, la corrispondenza migliore è quella di utilizzare un ospite mammifero a garantire la produzione di proteine ​​ricombinanti che contengono gli opportuni modifiche post-traslazionali. Un certo numero di linee cellulari di mammifero (embrionale umano Kidney (HEK) 293, C V-1 in cellule O rigine trasportano il S V40 larget T-antigene (COS), ovariche di criceto cinese (CHO), e altri) sono stati utilizzati con successo per sovraesprimere quantità milligrammi di un certo numero di proteine ​​umane 5-9. Tuttavia, i vantaggi di utilizzare cellule di mammifero sono spesso contrastate da maggiori costi, necessità di apparecchiature di laboratorio specializzato, rese inferiori, proteine ​​e tempi lunghi per sviluppare linee cellulari stabili di espressione. Aumentare la resa e la produzione di proteine ​​più veloci, mantenendo bassi i costi, sono fattori importanti per molti laboratori accademici e commerciali. Qui, noi descriviamo un tempo e costi contenuti, in due parti procedura per l&#39;espressione di proteine ​​umane secrete da cellule HEK aderenti 293T. Questo sistema è in grado di produrre quantitativi microgrammi per milligrammo di proteina funzionale per studi strutturali, biofisico e biochimiche. La prima parte, costrutti multiple del gene di interesse sono produrred in parallelo e transitoriamente trasfettate in cellule HEK aderenti 293T in piccola scala. La rilevazione e l&#39;analisi di proteina ricombinante secreto nel mezzo di coltura cellulare viene effettuata mediante analisi western blot utilizzando anticorpi disponibili commercialmente diretti contro un vettore codificato tag proteina purificazione. Successivamente, costrutti adatti per produzione su larga scala di proteine ​​vengono trasfettate transitoriamente usando polietilenimmina (PEI) in 10-strato fabbriche di cellule. Le proteine ​​secrete in litro di volumi di terreno condizionato sono concentrate in quantità gestibili mediante filtrazione a flusso tangenziale, seguita da purificazione da anti-HA cromatografia di affinità. L&#39;utilità di questa piattaforma è provato dalla sua capacità di esprimere quantità di milligrammi di citochine, recettori delle citochine, recettori della superficie cellulare, i fattori intrinseci, di restrizione e glicoproteine ​​virali. Questo metodo è stato utilizzato con successo nella determinazione strutturale dei 5,10 trimeriche glicoproteina ebolavirus. <p class = &quot;jove_content&quot;&gt; In conclusione, questa piattaforma offre facilità d&#39;uso, velocità e scalabilità massimizzando al contempo la qualità delle proteine ​​e la funzionalità. Inoltre, nessuna attrezzatura aggiuntiva, diversa da una normale incubatore umidificato CO 2, è richiesto. Questa procedura può essere rapidamente esteso a sistemi di maggiore complessità, come co-espressione di complessi proteici, antigeni e anticorpi, la produzione di particelle simili a virus di vaccini, o produzione di adenovirus o lentivirus per la trasduzione di linee cellulari difficili.

Watch this Scientific Journal Video about A Convenient and General Expression Platform for the Production of Secreted Proteins from Human Cells at JoVE.com

A Convenient and General Expression Platform for the Production of Secreted Proteins from Human Cells

Nel periodo post-genomica umana, la disponibilità di proteine ​​ricombinanti in conformazione nativa è cruciale per la ricerca strutturali, funzionali e terapeutico e lo sviluppo. Qui viene descritto un test e larga scala sistema di espressione proteica in cellule renali embrionali umane 293T che possono essere utilizzati per produrre una varietà di proteine ​​ricombinanti.

Una piattaforma espressione conveniente e generale per la produzione di proteine ​​secrete da cellule umane

Recombinant protein expression in bacteria, typically E. coli, has been the most successful strategy for milligram quantity expression of proteins. ...

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21.0K Views.  University of Toronto. Nel periodo post-genomica umana, la disponibilità di proteine ​​ricombinanti in conformazione nativa è cruciale per la ricerca strutturali, funzionali e terapeutico e lo sviluppo. Qui viene descritto un test e larga scala sistema di espressione proteica in cellule renali embrionali umane 293T che possono essere utilizzati per produrre una varietà di proteine ​​ricombinanti.

Video: A Convenient and General Expression Platform for the Production of Secreted Proteins from Human Cells

The Preparation of Primary Hematopoietic Cell Cultures From Murine Bone Marrow for Electroporation

It is becoming increasingly apparent that electroporation is the most effective way to introduce plasmid DNA or siRNA into primary cells. The Gene Pulser MXcell  electroporation system and Gene Pulser  electroporation buffer were specifically developed to transfect nucleic acids into mammalian cells and difficult-to-transfect cells, such as primary and stem cells.This video demonstrates how to establish primary hematopoietic cell cultures from murine bone marrow, and then prepare them for electroporation in the MXcell system. We begin by isolating femur and tibia. Bone marrow from both femur and tibia are then harvested and cultures are established. Cultured bone marrow cells are then transfected and analyzed.

This procedure describes how to establish primary hematopoietic cell cultures from murine bone marrow and is followed by transfection using the Gene Pulser MXCell electroporation system.

La preparazione di colture primarie di cellule emopoietiche dal midollo osseo murino per elettroporazione

It is becoming increasingly apparent that electroporation is the most effective way to introduce plasmid DNA or siRNA into primary cells. The Gene Pulser ...

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Biologia

Staining of Proteins in Gels with Coomassie G-250 without Organic Solvent and Acetic Acid

In classical protein staining protocols using Coomassie Brilliant Blue (CBB), solutions with high contents of toxic and flammable organic solvents (Methanol, Ethanol or 2-Propanol) and acetic acid are used for fixation, staining and destaining of proteins in a gel after SDS-PAGE. To speed up the procedure, heating the staining solution in the microwave oven for a short time is frequently used. This usually results in evaporation of toxic or hazardous Methanol, Ethanol or 2-Propanol and a strong smell of acetic acid in the lab which should be avoided due to safety considerations. In a protocol originally published in two patent applications by E.M. Wondrak (US2001046709 (A1), US6319720 (B1)), an alternative composition of the staining solution is described in which no organic solvent or acid is used. The CBB is dissolved in bidistilled water (60-80mg of CBB G-250 per liter) and 35 mM HCl is added as the only other compound in the staining solution. The CBB staning of the gel is done after SDS-PAGE and thorough washing of the gel in bidistilled water. By heating the gel during the washing and staining steps, the process can be finished faster and no toxic or hazardous compunds are evaporating. The staining of proteins occurs already within 1 minute after heating the gel in staining solution and is fully developed after 15-30 min with a slightly blue background that is destained completely by prolonged washing of the stained gel in bidistilled water, without affecting the stained protein bands.

A short protocol for protein staining with Coomassie Brilliant Blue (CBB) G-250 in polyacrylamide gels is described without using organic solvents or acetic acid as in the classical staining procedures with CBB.

La colorazione delle proteine ​​in gel con Coomassie G-250, senza solventi organici acido acetico e

In classical protein staining protocols using Coomassie Brilliant Blue (CBB), solutions with high contents of toxic and flammable organic solvents ...

Using the Gene Pulser MXcell Electroporation System to Transfect Primary Cells with High Efficiency

It is becoming increasingly apparent that electroporation is the most effective way to introduce plasmid DNA or siRNA into primary cells. The Gene Pulser MXcell electroporation system and Gene Pulser electroporation buffer (Bio-Rad) were specifically developed to easily transfect nucleic acids into mammalian cells and difficult-to-transfect cells, such as primary and stem cells. We will demonstrate how to perform a simple experiment to quickly identify the best electroporation conditions. We will demonstrate how to run several samples through a range of electroporation conditions so that an experiment can be conducted at the same time as optimization is performed. We will also show how optimal conditions identified using 96-well electroporation plates can be used with standard electroporation cuvettes, facilitating the switch from electroporation plates to electroporation cuvettes while maintaining the same electroporation efficiency. In the video, we will also discuss some of the key factors that can lead to the success or failure of electroporation experiments.

This procedure shows how to use the Gene Pulser MXcell electroporation system to rapidly and easily identify the best electroporation conditions for mouse embryonic fibroblasts (MEFs) or other primary cells. Considerations for troubleshooting are also discussed in the associated video.

Utilizzando il sistema di elettroporazione Gene Pulser MXcell per trasfettare cellule primarie con alta efficienza

Using an Automated Cell Counter to Simplify Gene Expression Studies: siRNA Knockdown of IL-4 Dependent Gene Expression in Namalwa Cells

The use of siRNA mediated gene knockdown is continuing to be an important tool in studies of gene expression.  siRNA studies are being conducted not only to study the effects of downregulating single genes, but also to interrogate signaling pathways and other complex interaction networks.  These pathway analyses require both the use of relevant cellular models and methods that cause less perturbation to the cellular physiology.  Electroporation is increasingly being used as an effective way to introduce siRNA and other nucleic acids into difficult to transfect cell lines and primary cells without altering the signaling pathway under investigation. There are multiple critical steps to a successful siRNA experiment, and there are ways to simplify the work while improving the data quality at several experimental stages.  To help you get started with your siRNA mediated gene knockdown project, we will demonstrate how to perform a pathway study complete from collecting and counting the cells prior to electroporation through post transfection real-time PCR gene expression analysis.  The following study investigates the role of the transcriptional activator STAT6 in IL-4 dependent gene expression of CCL17 in a Burkitt lymphoma cell line (Namalwa).  The techniques demonstrated are useful for a wide range of siRNA-based experiments on both adherent and suspension cells.  We will also show how to streamline cell counting with the TC10 automated cell counter, how to electroporate multiple samples simultaneously using the MXcell electroporation system, and how to simultaneously assess RNA quality and quantity with the Experion automated electrophoresis system.

This procedure describes a quick and easy workflow to introduce siRNA into difficult to transfect cell lines and follow gene expression by real-time PCR. Use of an automated cell counter, multi-well electroporation plate, and automated electrophoresis station provide quick and reliable results without the need for expensive robotic handling.

L&#39;utilizzo di un contatore automatico cella per semplificare gli studi sull&#39;espressione genica: Knockdown siRNA di IL-4 genica dipendente nelle celle Namalwa

The use of siRNA mediated gene knockdown is continuing to be an important tool in studies of gene expression.  siRNA studies are being conducted not only ...

The MultiBac Protein Complex Production Platform at the EMBL

Proteomics research revealed the impressive complexity of eukaryotic proteomes in unprecedented detail. It is now a commonly accepted notion that proteins in cells mostly exist not as isolated entities but exert their biological activity in association with many other proteins, in humans ten or more, forming assembly lines in the cell for most if not all vital functions.1,2 Knowledge of the function and architecture of these multiprotein assemblies requires their provision in superior quality and sufficient quantity for detailed analysis. The paucity of many protein complexes in cells, in particular in eukaryotes, prohibits their extraction from native sources, and necessitates recombinant production. The baculovirus expression vector system (BEVS) has proven to be particularly useful for producing eukaryotic proteins, the activity of which often relies on post-translational processing that other commonly used expression systems often cannot support.3 BEVS use a recombinant baculovirus into which the gene of interest was inserted to infect insect cell cultures which in turn produce the protein of choice. MultiBac is a BEVS that has been particularly tailored for the production of eukaryotic protein complexes that contain many subunits.4 A vital prerequisite for efficient production of proteins and their complexes are robust protocols for all steps involved in an expression experiment that ideally can be implemented as standard operating procedures (SOPs) and followed also by non-specialist users with comparative ease. The MultiBac platform at the European Molecular Biology Laboratory (EMBL) uses SOPs for all steps involved in a multiprotein complex expression experiment, starting from insertion of the genes into an engineered baculoviral genome optimized for heterologous protein production properties to small-scale analysis of the protein specimens produced.5-8 The platform is installed in an open-access mode at EMBL Grenoble and has supported many scientists from academia and industry to accelerate protein complex research projects.

Protein complexes catalyze key cellular functions. Detailed functional and structural characterization of many essential complexes requires recombinant production. MultiBac is a baculovirus/insect cell system particularly tailored for expressing eukaryotic proteins and their complexes. MultiBac was implemented as an open-access platform, and standard operating procedures developed to maximize its utility.

Il MultiBac Protein Complex Piattaforma di produzione al EMBL

Proteomics  research revealed the impressive complexity of eukaryotic proteomes in  unprecedented detail. It is now a commonly accepted notion that ...

Efficient Production and Purification of Recombinant Murine Kindlin-3 from Insect Cells for Biophysical Studies

Kindlins are essential coactivators, with talin, of the cell surface receptors&#160;integrins and also participate in integrin outside-in signalling, and the control of gene transcription in the cell nucleus. The kindlins are ~75 kDa multidomain proteins and bind to an NPxY motif and upstream T/S cluster of the integrin &#946;-subunit cytoplasmic tail. The hematopoietically-important kindlin isoform, kindlin-3, is critical for platelet aggregation during thrombus formation, leukocyte rolling in response to infection and inflammation and osteoclast podocyte formation in bone resorption. Kindlin-3&#39;s role in these processes has resulted in extensive cellular and physiological studies. However, there is a need for an efficient method of acquiring high quality milligram quantities of the protein for further studies. We have developed a protocol, here described, for the efficient expression and purification of recombinant murine kindlin-3 by use of a baculovirus-driven expression system in Sf9 cells yielding sufficient amounts of high purity full-length protein to allow its biophysical characterization. The same approach could be taken in the study of the other mammalian kindlin isoforms.

Kindlins are fundamental to cell adhesion through integrins but studies of them have been hampered by the difficulty encountered in expressing them recombinantly in bacterial hosts. We describe here methods for their efficient production in baculovirus-infected insect cells.

Produzione efficiente e purificazione di ricombinante murino kindlina-3 da cellule di insetto per Biofisica Studies

Kindlins are essential coactivators, with talin, of the cell surface receptors&#160;integrins and also participate in integrin outside-in signalling, and ...

Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli

The production of recombinant membrane proteins for structural and functional studies remains technically challenging due to low levels of expression and the inherent instability of many membrane proteins once solubilized in detergents. A protocol is described that combines ligation independent cloning of membrane proteins as GFP fusions with expression in Escherichia coli detected by GFP fluorescence. This enables the construction and expression screening of multiple membrane protein/variants to identify candidates suitable for further investment of time and effort. The GFP reporter is used in a primary screen of expression by visualizing GFP fluorescence following SDS polyacrylamide gel electrophoresis (SDS-PAGE). Membrane proteins that show both a high expression level with minimum degradation as indicated by the absence of free GFP, are selected for a secondary screen. These constructs are scaled and a total membrane fraction prepared and solubilized in four different detergents. Following ultracentrifugation to remove detergent-insoluble material, lysates are analyzed by fluorescence detection size exclusion chromatography (FSEC). Monitoring the size exclusion profile by GFP fluorescence provides information about the mono-dispersity and integrity of the membrane proteins in different detergents. Protein: detergent combinations that elute with a symmetrical peak with little or no free GFP and minimum aggregation are candidates for subsequent purification. Using the above methodology, the heterologous expression in E. coli of SED (shape, elongation, division, and sporulation) proteins from 47 different species of bacteria was analyzed. These proteins typically have ten transmembrane domains and are essential for cell division. The results show that the production of the SEDs orthologues in E. coli was highly variable with respect to the expression levels and integrity of the GFP fusion proteins. The experiment identified a subset for further investigation.

Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli

A streamlined approach to screening for the expression of recombinant membrane proteins in Escherichia coli based on fusion to green fluorescent protein is presented.

Green Fluorescent Protein-base Espressione Proiezione di proteine ​​di membrana in<em&gt; Escherichia coli</em

The production of recombinant membrane proteins for structural and functional studies remains technically challenging due to low levels of expression and ...

Enrichment of Extracellular Matrix Proteins from Tissues and Digestion into Peptides for Mass Spectrometry Analysis

The extracellular matrix (ECM) is a complex meshwork of cross-linked proteins that provides biophysical and biochemical cues that are major regulators of cell proliferation, survival, migration, etc. The ECM plays important roles in development and in diverse pathologies including cardio-vascular and musculo-skeletal diseases, fibrosis, and cancer. Thus, characterizing the composition of ECMs of normal and diseased tissues could lead to the identification of novel prognostic and diagnostic biomarkers and potential novel therapeutic targets. However, the very nature of ECM proteins (large in size, cross-linked and covalently bound, heavily glycosylated) has rendered biochemical analyses of ECMs challenging. To overcome this challenge, we developed a method to enrich ECMs from fresh or frozen tissues and tumors that takes advantage of the insolubility of ECM proteins. We describe here in detail the decellularization procedure that consists of sequential incubations in buffers of different pH and salt and detergent concentrations and that results in 1) the extraction of intracellular (cytosolic, nuclear, membrane and cytoskeletal) proteins and 2) the enrichment of ECM proteins. We then describe how to deglycosylate and digest ECM-enriched protein preparations into peptides for subsequent analysis by mass spectrometry.

This protocol describes a procedure for enriching ECM proteins from tissues or tumors and deglycosylating and digesting the ECM-enriched preparations into peptides to analyze their protein composition by mass spectrometry.

Arricchimento della matrice extracellulare proteine ​​da tessuti e digestione in Peptidi per l&#39;analisi Spettrometria di Massa

The extracellular matrix (ECM) is a complex meshwork of cross-linked proteins that provides biophysical and biochemical cues that are major regulators of ...

High Yield Expression of Recombinant Human Proteins with the Transient Transfection of HEK293 Cells in Suspension

The art of producing recombinant proteins with complex post-translational modifications represents a major challenge for studies of structure and function. The rapid establishment and high recovery from transiently-transfected mammalian cell lines addresses this barrier and is an effective means of expressing proteins that are naturally channeled through the ER and Golgi-mediated secretory pathway. Here is one protocol for protein expression using the human HEK293F and HEK293S cell lines transfected with a mammalian expression vector designed for high protein yields. The applicability of this system is demonstrated using three representative glycoproteins that expressed with yields between 95-120 mg of purified protein recovered per liter of culture. These proteins are the human Fc&#947;RIIIa and the rat &#945;2-6 sialyltransferase, ST6GalI, both expressed with an N-terminal GFP fusion, as well as the unmodified human immunoglobulin G1 Fc. This robust system utilizes a serum-free medium that is adaptable for expression of isotopically enriched proteins and carbohydrates for structural studies using mass spectrometry and nuclear magnetic resonance spectroscopy. Furthermore, the composition of the N-glycan can be tuned by adding a small molecule to prevent certain glycan modifications in a manner that does not reduce yield.

Laboratory-scale production of eukaryotic proteins with appropriate post-translational modification represents a significant barrier. Here is a robust protocol with rapid establishment and turnaround for protein expression using a mammalian expression system. This system supports selective amino acid, selective labeling of proteins and small molecule modulators of glycan composition.

High Yield Espressione di proteine ​​ricombinanti umane con il Transient Trasfezione delle cellule HEK293 in sospensione

The art of producing recombinant proteins with complex post-translational modifications represents a major challenge for studies of structure and ...

Transient Expression and Cellular Localization of Recombinant Proteins in Cultured Insect Cells

Heterologous protein expression systems are used for the production of recombinant proteins, the interpretation of cellular trafficking/localization, and the determination of the biochemical function of proteins at the sub-organismal level. Although baculovirus expression systems are increasingly used for protein production in numerous biotechnological, pharmaceutical, and industrial applications, nonlytic systems that do not involve viral infection have clear benefits but are often overlooked and underutilized. Here, we describe a method for generating nonlytic expression vectors and transient recombinant protein expression. This protocol allows for the efficient cellular localization of recombinant proteins and can be used to rapidly discern protein trafficking within the cell. We show the expression of four&#160;recombinant proteins in a commercially available insect cell line, including two aquaporin proteins from the insect Bemisia tabaci, as well as subcellular marker proteins specific for the cell plasma membrane and for intracellular lysosomes. All recombinant proteins were produced as chimeras with fluorescent protein markers at their carboxyl termini, which allows for the direct detection of the recombinant proteins. The double transfection of cells with plasmids harboring constructs for the genes of interest and a known subcellular marker allows for live cell imaging and improved validation of cellular protein localization.

Nonlytic insect cell expression systems are underutilized for production, cellular trafficking/localization, and recombinant protein functional analysis. Here, we describe methods to generate expression vectors and subsequent transient protein expression in commercially available lepidopteran cell lines. The co-localization of Bemisia tabaci aquaporins with subcellular fluorescent marker proteins is also presented.

Espressione transitoria e Localizzazione cellulare di proteine ​​ricombinanti in cellule in coltura per insetti

Heterologous protein expression systems are used for the production of recombinant proteins, the interpretation of cellular trafficking/localization, and ...

Una piattaforma espressione conveniente e generale per la produzione di proteine ​​secrete da cellule umane

Una piattaforma espressione conveniente e generale per la produzione di proteine secrete da cellule umane