この作品は、JEL、およびHA、FCA、とJDCのトロントフェローシップの大学にオンタリオ州のHIV治療ネットワーク研究オペレーティング·グラント（ROG-G645）と保健研究の新しい奨励賞のカナダ研究所（MSH-113554）でサポートされていました。著者らは、細胞を提供するためのスクリップス研究所（カリフォルニア州ラホーヤ）、エボラウイルスGPの発現ベクターと一般的なアドバイスでマーニーフスコ、Dafnaアベルソン博士とエリカOllmannサファイアに感謝します。

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利害の衝突が宣言されません。

10層の細胞の工場は、蛋白質のミリグラム量の生産のための効果的な容器です。このようなローラーボトル、振盪フラスコまたはスピナーフラスコのような他の伝統的な船、上のセルファクトリを使用する主な利点は、追加の実験装置を購入する必要がないということです。標準的なCO 2インキュベーター（〜6.0立方フィート）は、簡単に4つの10層の細胞工場（ 図2）を収...

<table border="1"><tbody><tr><td> 試薬の名前 </td><td> 会社 </td><td> カタログ番号 </td><td>コメント</td></tr><tr><td>アルカリホスファターゼ（BCIP / NBT）液体基質溶液</td><td>シグマ</td><td> B6404 </td><td></td></tr><tr><td>抗生物質/抗真菌剤、100X </td><td>インビトロジェン</td><td> 15240062 </td><td></td></tr><tr><td>抗HAアフィニティマトリックス、クローン3F10 </td><td>ロシュ社</td><td> 1815016 </td><td></td></tr><tr><td>抗HAマウスmAb、クローン16B12 </td><td> Covance </td><td> MMS-101P </td><td></td></tr><tr><td>細胞培養フラスコ、処理されたT75 cm 2の組織培養</td><td>コー​​ニング</td><td> 430641 </td><td></td></tr><tr><td>細胞培養フラスコ、処理されたT225 cm 2の組織培養</td><td>コー​​ニング</td><td> 431082 </td><td></td></tr><tr><td>治療-1,6 - ウェル組織培養細胞培養プレート</td><td>コー​​ニング</td><td> 3516 </td><td></td></tr><tr><td>セルファクトリ、10層のCellSTACK </td><td>コー​​ニング</td><td> 3312 </td><td></td></tr><tr><td>セントラオメガ5Kカセット</td><td>ポール</td><td> OS005C12 </td><td></td></tr><tr><td>セントラオメガ30Kカセット</td><td>ポール</td><td> OS030C12 </td><td></td></tr><tr><td>クロマトグラフィーガラスカラム、1.0×10センチメートル</td><td> Kontes </td><td> 4204001010 </td><td></td></tr><tr><td>シプロフロキサシン</td><td>シグマ</td><td> 17850 </td><td></td></tr><tr><td> CO 2 </td><td></td><td></td><td></td></tr><tr><td>ダルベッコ改変イーグル培地（DMEM） </td><td>シグマ</td><td> D5796 </td><td></td></tr><tr><td>ウシ胎児血清（FBS）、不活化熱</td><td>インビトロジェン</td><td> 12484-028 </td><td></td></tr><tr><td>トランスフェHDトランスフェクション試薬</td><td>プロメガ</td><td> 4709691001 </td><td></td></tr><tr><td> GeneJuiceトランスフェクション試薬</td><td> EMD /メルク</td><td> 70967から6 </td><td></td></tr><tr><td>グリシン</td><td>シグマ</td><td> G8898 </td><td></td></tr><tr><td>ヤギ抗マウスIgG F（ab &#39;）2をアルカリ性</td><td>サーモフィッシャーサイエンティフィック</td><td> 31324 </td><td></td></tr><tr><td>ホスファターゼ標識抗体</td><td></td><td></td><td></td></tr><tr><td>ヘマグルチニン（HA）ペプチド、100 mgの</td><td> Genscript </td><td>カスタム合成</td><td></td></tr><tr><td> （シーケンス：YPYDVPDYA 95％純度） </td><td></td><td></td><td></td></tr><tr><td> HEK 293T細胞</td><td> ATCC </td><td> CRL-11268 </td><td></td></tr><tr><td> HouseholD漂白剤（4％w / vの次亜塩素酸ナトリウム） </td><td>様々なブランドが利用可能です</td><td></td><td></td></tr><tr><td>イモビロン-P PVDF膜</td><td>ミリポア</td><td> IPVH07850 </td><td></td></tr><tr><td>ミニプレップのプラスミド精製キット、PureLinkクイック</td><td>インビトロジェン</td><td> K2100-11 </td><td></td></tr><tr><td> MaxiPrepプラスミド精製キットPureLink HiPure </td><td>インビトロジェン</td><td> K2100-07 </td><td></td></tr><tr><td> NaN 3を </td><td>シグマ</td><td> S8032 </td><td></td></tr><tr><td> pDISPLAY発現ベクター</td><td>インビトロジェン</td><td> V660-20 </td><td></td></tr><tr><td> 100Xペニシリン/ストレプトマイシン（ペン/連鎖球菌） </td><td>インビトロジェン</td><td> 15140-122 </td><td></td></tr><tr><td>リン酸緩衝生理食塩水（PBS）、滅菌1X </td><td>シグマ</td><td> D8537 </td><td></td></tr><tr><td>ポリエチレンイミン（PEI）、線形25kDaの</td><td> Polyscience </td><td> 23966 </td><td></td></tr><tr><td>ミルク乾燥粉末をすくい取る</td><td>カーネーション</td><td></td><td></td></tr><tr><td> Stericup-GP PES真空ろ過装置、 </td><td>ミリポア</td><td> SCGPU05RE </td><td></td></tr><tr><td> 0.22μmの、500mlの容量</td><td></td><td></td><td></td></tr><tr><td>トリパンブルー</td><td>インビトロジェン</td><td> 15250061 </td><td></td></tr><tr><td>トリプシン-EDTA、0.05％（w / v）の</td><td>インビトロジェン</td><td> 25300-054 </td><td></td></tr><tr><td> Tween-20を</td><td>シグマ</td><td> P7949 </td><td></td></tr><tr><td>バルプロ酸</td><td>シグマ</td><td> P4543 </td><td></td></tr><tr><td>タンジェンシャルフローシステムセントラ</td><td>ポール</td><td></td><td></td></tr><tr><td> CO 2の加湿インキュベーター、標準6.0立方。フィート</td><td>様々なブランドが利用可能です</td><td></td><td></td></tr><tr><td>電気泳動およびトランスファーユニット</td><td>様々なブランドが利用可能です</td><td></td><td></td></tr><tr><td>インキュベーター、37°C </td><td>様々なブランドが利用可能です</td><td></td><td></td></tr></tbody></table>

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

細菌における組換えタンパク質の発現、一般的にE.大腸菌は 、蛋白質のミリグラム量の発現のための最も成功した戦略であった。しかし、原核生物宿主は、多くの人間は、ウイルスまたは真核生物の外国の高分子の毒性に起因するタンパク質、タンパク質の折り畳み機構の違い、または特定のCO-または細菌の翻訳後修飾の不足のための発現に応じてではありません。酵母（P.パストリスもしくはS.セレビシエ ）1,2、バキュロウイルス感染昆虫（S. frugiperdaまたは T NI）セル3、 および in vitro翻訳システムにおいて 、無細胞に基づく発現系は、2,4は正常にするために使用されている哺乳動物のタンパク質を生成します。直感的に、ベストマッチは、適切な翻訳後修飾を含む組換えタンパク質の生産を確保するために哺乳動物宿主を使用することです。哺乳動物細胞株の数（ヒト胚キッドネイ（HEK）S V40 larget T-抗原（COS）、チャイニーズハムスター卵巣（CHO）などを運ぶO riginで293、C V-1細胞）は、正常ヒトタンパク質の数ミリグラムの量を過剰発現するように利用されてきた5-9しかし、哺乳動物細胞を使用することの利点は、多くの場合、安定発現細胞株を開発するコストが高く、特殊な実験装置の要件は、低タンパク質の収量と、長い時間によって打ち消されています。コストを低く維持しながら、より高速な収率と生産するタンパク質を増加し、多くの学術的、商業的な研究所の主要な要因である。 ここでは、時間とコスト効率に優れ、接着HEK 293T細胞から分泌されるヒトタンパ​​ク質の発現のための2つの部分から成る手順を説明します。このシステムは、構造生物物理学的および生化学的研究のために機能的な蛋白質のミリグラム量にグラムを生産することが可能です。最初の部分は、目的の遺伝子の複数の構文が生成さです。並行して一時的に小さなスケールの付着HEK 293T細胞にトランスフェクションのd。細胞培養培地中に分泌された組換えタンパク質の検出および分析は、ベクトルでエンコードされたタンパク質精製タグに対する市販の抗体を用いたウェスタンブロット分析によって実行されます。その後、大規模なタンパク質の生産に適したコンストラクトを一過性に10層の細胞工場でポリエチレンイミン（PEI）を用いてトランスフェクトされる。馴化培地リットルボリュームに分泌されるタンパク質は、抗-HAアフィニティークロマトグラフィーによって精製してタンジェンシャルフローろ過を使用して、管理しやすい量に集中している。このプラットフォームのユーティリティは、サイトカイン、サイトカイン受容体、細胞表面受容体、本質的な制限要因、およびウイルスの糖蛋白質のミリグラム量を表現する能力によって証明されています。このメソッドは、成功した三量体エボラウイルス糖タンパク質5,10の構造決定で使用されています。 2インキュベーター以外の追加の機器は、必要ありません。この手順は、急速にそのようなタンパク質複合体、抗原と抗体、ワクチン、または困難な細胞株の形質導入のためのアデノウイルスまたはレンチウイルスの生産のためのウイルス様粒子の生産の共発現として、より複雑なシステムに拡張することができます。

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

ポストヒトゲノム時代において、ネイティブコンフォメーションにおける組換えタンパク質の可用性は、構造、機能および治療の研究開発に不可欠である。ここでは、テストと組換えタンパク質のさまざまなを生成するために使用することができるヒト胚性腎臓293T細胞における大規模タンパク質発現系を記述します。

ヒト細胞から分泌タンパク質の生産のための便利で一般式プラットフォーム

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

a-convenient-general-expression-platform-for-production-secreted

Research

JoVE Journal

Biology

21.0K ビュー.  University of Toronto. ポストヒトゲノム時代において、ネイティブコンフォメーションにおける組換えタンパク質の可用性は、構造、機能および治療の研究開発に不可欠である。ここでは、テストと組換えタンパク質のさまざまなを生成するために使用することができるヒト胚性腎臓293T細胞における大規模タンパク質発現系を記述します。

ビデオ: 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.

エレクトロポレーションのためのマウス骨髄からの一次造血細胞培養の準備

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

生物学

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.

クーマシー有機溶媒および酢酸のないG - 250でゲル中のタンパク質の染色

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.

高効率で初代培養細胞をトランスフェクトするためにジーンパルサーMXcellのエレクトロポレーションシステムの使用

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.

ナマルバ細胞におけるIL - 4依存性遺伝子発現のsiRNAのノックダウン：遺伝子発現研究を簡素化する自動化セルカウンターの使い方

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.

EMBLでMultiBacタンパク質複合体生産プラットフォーム

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.

生物物理学研究のための昆虫細胞からの効率的な生産と組換えマウスKindlin-3の精製

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.

膜タンパク質の緑色蛍光タンパク質ベースの発現スクリーニングで<em&gt;エシェリヒア·コリ</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.

質量分析のためのペプチドに組織および消化から細胞外マトリックスタンパク質の濃縮

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.

懸濁液中のHEK293細胞の一過性トランスフェクションによる組換えヒトタンパ​​ク質のハイ・イールド式

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.

培養昆虫細胞における一過性発現および組換えタンパク質の細胞内局在

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