產(chǎn)品全名: Gα13 Pull-Down Activation Assay Kit
規(guī)格: 30 Assays
品牌: 美國 NewEast Biosciences
應(yīng)用: Pull-Down
監(jiān)測: Active Gα13-GTP level
Gα13 Pull-Down Activation Assay Kit
Cat. # 80401
Introduction
A. Background
A structurally diverse repertoire of ligands, from photons to large peptides, activates GPCRs to elicit their physiological functions. Ligand-bound GPCRs, in turn, function as guanine nucleotide exchange factors catalyzing the exchange of GDP bound on the Gα subunit with GTP in the presence of Gβγ, causing the dissociation of the Gα subunit from the Gβγ dime to form two functional units (Gα and Gβγ). Both Gα and Gβγ subunits signal to various cellular signaling pathways. Based on the sequence and functional homologies, G proteins are grouped into four families: Gs, Gi, GGq, and G12. As increasing numbers of effectors and interacting proteins for these G proteins have been identified, the physiological processes in which G proteins participate are multiplying.
Among the four subfamilies of G proteins, the function of G12/13 subfamily is less well understood. In this family, there are two members, G12 and G13, that are expressed ubiquitously. Gα12 knockout mice appeared normal. Gα13 knockout mice displayed embryonic lethality (~E9.5). The Gα13-/- mouse embryos had defective vascular systems. G13 is also essential for receptor tyrosine kinase-induced migration of fibroblast and endothelial cells.
B. Assay Principle
The Gα13 Activation Assay Kit uses configuration-specific anti-Gα13-GTP Mouse monoclonal antibody to measure Gα13-GTP levels in cell extracts or in vitro GTPγS loading Gα13 activation assays. Anti-Gα13-GTP mouse monoclonal antibody is first incubated with cell lysates containing Gα13-GTP. Next, the GTP-bound Gα13 is pulled down by protein A/G agarose. Finally, the precipitated Gα13-GTP is detected through immunoblot analysis using anti-Gα13 mouse monoclonal antibody.
C. Kit Components
1. Anti-Gα13-GTP Mouse Monoclonal Antibody (Cat. # 26902): One vial – 35 μL (1 mg/ml) in PBS, pH 7.4, containing 50% glycerol. This antibody specifically recognizes Gα13-GTP from all vertebrates.
2. Protein A/G Agarose (Cat. # 30301): One vial – 600 μL of 50% slurry.
3. 5X Assay/Lysis Buffer (Cat. # 30302): One bottle – 30 mL of 250 mM Tris-HCl, pH 8, 750mM NaCl, 50 mM MgCl2, 5 mM EDTA, 5% Triton X-100.
4. Anti-Gα13 Mouse monoclonal Antibody (Cat. # 21005): One vial – 50 μL (1mg/mL) in PBS, pH 7.4, contained 50% glycerol.
5. 100X GTPγS (Cat. # 30303): One vial – 50 μl at 10 mM, use 5 μL of GTPγS for GTP-labeling of 0.5 mL of cell lysate.
6. 100X GDP (Cat. # 30304): One vial – 50 μl at 100 mM, use 5 μL of GDP for GDP-labeling of 0.5 mL of cell lysate.
7. HRP-Goat Anti-Rabbit IgG (Cat. #29002): 50 μL (0.4 mg/mL) in PBS, pH 7.4, contained 50% glycerol.
D. Materials Needed but Not Supplied
1. Stimulated and non-stimulated cell lysates
2. Protease inhibitors
3. 4°C tube rocker or shaker
4. 0.5 M EDTA at pH 8.0
5. 1.0 M MgCl2
6. 2X reducing SDS-PAGE sample buffer
7. Electrophoresis and immunoblotting systems
8. Immunoblotting wash buffer such as TBST (10 mM Tris-HCl, pH 7.4, 0.15 M NaCl, 0.05% Tween-20)
9. Immunoblotting blocking buffer (TBST containing 5% Non-fat Dry Milk or 3% BSA)
10. ECL Detection Reagents
E. Example Results
The following figure demonstrates example results seen with the Gα13 Activation Assay Kit. For reference only.
Gα13 Activation Assay. MEF cells were treated with (lane 2) or without (lane 1) LPA. Cell lysates were incubated with an anti-Gα13-GTP monoclonal antibody (Cat. # 26902) (top panel). The precipitated active Gα13 was immunoblotted with an anti-Gα13 rabbit polyclonal antibody (Cat. # 21005). The bottom panel shows the Western blot with anti-Gα13 of the cell lysates used (5% of that used in the top panel).
Assay Procedure
A. Reagent Preparation
1X Assay/Lysis Buffer: Mix the 5X Stock (Cat. # 30301) briefly and dilute to 1X in deionized water. Just prior to usage, add protease inhibitors such as 1 mM PMSF, 10 μg/mL leupeptin, or 10 μg/mL aprotinin.
B. Sample Preparation
Adherent Cells
1. Culture cells (one 10-cm plate, ~107 cells) to approximately 80-90% confluence. Stimulate the cells with activator or inhibitor as desired.
2. Aspirate the culture media and wash twice with ice-cold PBS.
3. Completely remove the final PBS wash and add ice-cold 1X Assay/Lysis Buffer (See Reagent Preparation) to the cells (0.5-1 mL per 10 cm tissue culture plate).
4. Place the culture plates on ice for 10-20 minutes.
5. Detach the cells from the plates by scraping with a cell scraper.
6. Transfer the lysates to appropriate size tubes and place on ice.
7. If nuclear lysis occurs, the cell lysates may become viscous and difficult to pipette. If this occurs, lysates can be passed through a 27?-gauge syringe needle 3-4 times to shear the genomic DNA.
8. Clear the lysates by centrifuging at 12,000 x g and 4°C for 10 minutes.
9. Collect the supernatant and store the sample (~1-2 mg of total protein) on ice for immediate use, or snap freeze and store at -70°C for future use.
Adherent Cells
1. Culture cells and stimulate with activator or inhibitor as desired.
2. Perform a cell count and then pellet the cells through centrifugation.
3. Aspirate the culture media and wash twice with ice-cold PBS.
4. Completely remove the final PBS wash and add ice-cold 1X Assay/Lysis Buffer (See Reagent Preparation) to the cell pellet (0.5-1 mL per 107 cells).
5. Lyse the cells by repeated pipetting.
6. Transfer the lysates to appropriate size tubes and place them on ice.
7. If nuclear lysis occurs, the cell lysates may become viscous and difficult to pipette. If this occurs, lysates can be passed through a 27?-gauge syringe needle 3-4 times to shear the genomic DNA.
8. Clear the lysates by centrifuging at 12,000 x g and 4°C for 10 minutes.
9. Collect the supernatant and store sample on ice for immediate use, or snap freeze and store at -70°C for future use.
C. In vitro GTPγS/GDP Protein for Positive and Negative controls
Note: In vivo stimulation of cells will activate approximately 10% of the available Gα13, whereas in vitro GTPγS protein loading will activate nearly 90% of Gα13.
1. Aliquot 0.5 mL of cell extract (or 1 μg of purified Gα13 protein) into two microcentrifuge tubes.
2. To each tube, add 20 μL of 0.5 M EDTA (final concentration of 20 mM).
3. Positive control: add 5 μL of 100 X GTPγS (Cat. # 30302) to the 1st tube
4. Negative control: add 5 μL of 100 X GDP (Cat. # 30304) to the 2nd tube.
5. Incubate both tubes at 30°C for 30 minutes with agitation.
6. Stop loading by placing the tubes on ice and adding 32.5 μL of 1 M MgCl2 (final concentration of 60 mM).
D. Affinity Precipitation of Activated G Protein
1. Aliquot 0.5-1 mL of cell lysates (about 1 mg of total cellular protein) to a microcentrifuge tube.
2. Adjust the volume to 1 mL with 1X Assay/Lysis Buffer (See Reagent Preparation).
3. Add 1 μL anti-Gα13-GTP antibody (Cat. # 26902).
4. Prepare the protein A/G Agarose bead slurry (Cat. # 30301) by resuspending through vertexing or titrating.
5. Quickly add 20 μL of resuspended bead slurry to above tube.
6. Incubate the tube at 4°C for 1 hour with gentle agitation.
7. Pellet the beads through centrifugation at 5,000 x g for 1 min.
8. Aspirate and discard the supernatant (making sure not to disturb or remove the bead pellet.
9. Wash the beads 3 times with 0.5 mL of 1X Assay/Lysis Buffer, centrifuging and aspirating each time.
10. After the third wash, pellet the beads through centrifugation and carefully remove all the supernatant.
11. Resuspend the bead pellet in 20 μL of 2X reducing SDS- PAGE sample buffer.
12. Boil the sample for 5 minutes.
13. Centrifuge it at 5,000 x g for 10 seconds.
E. Western Blot Analysis
1. Load 15 μL/well of pull-down supernatant to a polyacrylamide gel (17%). It is recommended to include a pre-stained MW standard (as an indicator of a successful transfer in step 3 below).
2. Perform SDS-PAGE following the manufacturer’s instructions.
3. Transfer the gel proteins to a PVDF or nitrocellulose membrane following the manufacturer’s instructions.
Note: Steps 4-11 are at room temperature with agitation
4. Following electroblotting, immerse the PVDF membrane in 100% Methanol for 15 seconds, and then allow it to dry at room temperature for 5 minutes.
Note: If Nitrocellulose is used instead of PVDF, step 4 Should be skipped.
5. Block the membrane with 5% non-fat dry milk or 3% BSA in TBST for 1 he at room temperature with constant agitation.
6. Wash the blotted membrane three times with TBST, 5 minutes each time.
7. Incubate the membrane with anti-Gα13 Mouse Monoclonal Antibody (Cat. # 21005), which has been freshly diluted 1: 50~500 (depending on the amount of Gα13 proteins in your sample) in 5% non-fat dry milk or 3% BSA in TBST, for 1-2 her at room temperature with constant agitation or at 4°C overnight.
8. Wash the blotted membrane three times with TBST, 5 minutes each time.
9. Incubate the membrane with a secondary antibody (Cat. # 29002), which has been freshly diluted 1: 1000 in 5% non-fat dry milk or 3% BSA in TBST, for 1 he at room temperature with constant agitation.
10. Wash the blotted membrane three times with TBST, 5 minutes each time.
11. Use the detection method of your choice such as ECL.
關(guān)鍵字： Gα13 活性檢測試劑盒;
武漢費(fèi)斯德生物科技有限公司是美國NewEast Biosciences在中國的辦事處，也是目前國內(nèi)唯一經(jīng)銷處。
目前客戶使用產(chǎn)品發(fā)表超過1000谷歌學(xué)術(shù)文獻(xiàn)，其中論文分布排名前50刊物上。
NewEast Biosciences 在十二年前率先研發(fā)倆種獨(dú)特的抗體。這倆種抗體僅僅識別活性的GTP酶或者突變的Oncogene。 GTP酶涉及(1)響應(yīng)細(xì)胞表面受體激活的信號轉(zhuǎn)導(dǎo)，包括跨膜受體，例如介導(dǎo)味覺、嗅覺和視覺的那些，（2）核糖體的蛋白質(zhì)生物合成，（3）調(diào)節(jié)細(xì)胞分化、增殖、分裂和運(yùn)動(dòng)，（4）蛋白質(zhì)通過膜的易位，（5）細(xì)胞內(nèi)囊泡的運(yùn)輸，以及囊泡介導(dǎo)的分泌和攝取，通過GTP酶控制囊泡外殼組裝。Oncogene側(cè)是誘發(fā)癌癥的基因。
更多產(chǎn)品類目和技術(shù)資料可查看：武漢費(fèi)斯德生物官網(wǎng)。
武漢費(fèi)斯德生物科技有限公司將向你提供以下，抗體或者試劑盒: (1) 僅識別 GTP酶的活性構(gòu)型的產(chǎn)品, 它可以讓你能夠量化GTP酶在細(xì)胞中的活性和分布。(2) 識別突變 Oncogene蛋白, 但不認(rèn)識相應(yīng)野生型的抗體。 (3) 對 cAMP 和 cGMP 具有超親和力（無需乙?；〦LISA檢測試劑盒。
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