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- Analytical tools
Phospho-Akt (Ser473) (587F11) Mouse mAb (Biotinylated) #5102
Akt phosphorylated at serine 473 was immunoprecipitated from untreated or LY294002 treated Jurkat cell extracts, using Phospho-Akt (Ser473) (587F11) Mouse mAb (Biotinylated). This immunocomplex was then pulled down using streptavidin beads. Western blotting was performed with Phospho-Akt (Ser473) Antibody #9271.Learn more about how we get our images
Gallery: Phospho-Akt (Ser473) (587F11) Mouse mAb (Biotinylated) #5102
Immunoprecipitation for Native Proteins
This protocol is intended for immunoprecipitation of native proteins for analysis by western immunoblot or kinase activity.
A. Solutions and Reagents
NOTE: Prepare solutions with reverse osmosis deionized (RODI) or equivalent grade water.
- 20X Phosphate Buffered Saline (PBS): (#9808) To prepare 1 L of 1X PBS, add 50 ml 20X PBS to 950 ml dH2O, mix.
10X Cell Lysis Buffer: (#9803) To prepare 10 ml of 1X cell lysis buffer, add 1 ml cell lysis buffer to 9 ml dH2O, mix.
NOTE: Add 1 mM PMSF (#8553) immediately prior to use.
- 3X SDS Sample Buffer: Blue Loading Pack (#7722) or Red Loading Pack (#7723) Prepare fresh 3X reducing loading buffer by adding 1/10 volume 30X DTT to 1 volume of 3X SDS loading buffer.
- Streptavidin (Sepharose® Bead Conjugate) (For biotinylated antibodies): (#3419) Gently vortex vial and use 10 µl per immunoprecipitation.
- 10X Kinase Buffer (for kinase assays): (#9802) To Prepare 1 ml of 1X kinase buffer, add 100 µl 10X kinase buffer to 900 µl dH2O, mix.
- ATP (10 mM) (for kinase assays): (#9804) To prepare 0.5 ml of ATP (200 µM), add 10 µl ATP (10 mM) to 490 µl 1X kinase buffer.
B. Preparing Cell Lysates
- Aspirate media. Treat cells by adding fresh media containing regulator for desired time.
- To harvest cells under nondenaturing conditions, remove media and rinse cells once with ice-cold 1X PBS.
- Remove PBS and add 0.5 ml ice-cold 1X cell lysis buffer to each plate (10 cm) and incubate on ice for 5 min.
- Scrape cells off the plate and transfer to microcentrifuge tubes. Keep on ice.
- Sonicate on ice three times for 5 sec each.
- Microcentrifuge for 10 min at 4°C, 14,000 x g and transfer the supernatant to a new tube. The supernatant is the cell lysate. If necessary, lysate can be stored at -80°C.
Cell Lysate Pre-Clearing (Optional)
- Add 10 µl Streptavidin (Sepharose® Bead Conjugate) (#3419; for biotinylated antibodies), to 200 µl cell lysate at 1 mg/ml.
- Incubate with rotation at 4°C for 30–60 min.
- Microcentrifuge for 10 min at 4°C. Transfer the supernatant to a fresh tube.
- Proceed to immunoprecipitation below.
- Add biotinylated antibody (at the appropriate dilution as recommended in the product datasheet) to 200 µl cell lysate at 1 mg/ml. Incubate with rotation overnight at 4°C.
- Gently mix Streptavidin (Sepharose® Bead Conjugate) (#3419) and add 10 µl of slurry. Incubate with rotation for 2 hr at 4°C.
- Microcentrifuge for 30 sec at 4°C. Wash pellet five times with 500 µl of 1X cell lysis buffer. Keep on ice during washes.
- Proceed to sample analysis by western immunoblotting or kinase activity (section D).
D. Sample Analysis
Proceed to one of the following specific set of steps.
For Analysis by Western Immunoblotting
- Resuspend the pellet with 20 µl 3X SDS sample buffer. Vortex, then microcentrifuge for 30 sec at 14,000 x g.
- Heat the sample to 95–100°C for 2-5 min and microcentrifuge for 1 min at 14,000 x g.
- Load the sample (15–30 µl) on a 4–20% gel for SDS-PAGE.
- Analyze sample by western blot (see Western Immunoblotting Protocol).
NOTE: To minimize masking caused by denatured IgG heavy chains (~50 kDa), we recommend using Mouse Anti-Rabbit IgG (Light-Chain Specific) (L57A3) mAb (#3677) or Mouse Anti-Rabbit IgG (Conformation Specific) (L27A9) mAb (#3678) (or HRP conjugate #5127). To minimize masking caused by denatured IgG light chains (~25 kDa), we recommend using Mouse Anti-Rabbit IgG (Conformation Specific) (L27A9) mAb (#3678) (or HRP conjugate #5127).
For Analysis by Kinase Assay
- Wash pellet twice with 500 µl 1X kinase buffer. Keep on ice.
- Suspend pellet in 40 µl 1X kinase buffer supplemented with 200 µM ATP and appropriate substrate.
- Incubate for 30 min at 30°C.
- Terminate reaction with 20 µl 3X SDS sample buffer. Vortex, then microcentrifuge for 30 sec.
- Transfer supernatant containing phosphorylated substrate to another tube.
- Heat the sample to 95–100°C for 2–5 min and microcentrifuge for 1 min at 14,000 x g.
- Load the sample (15–30 µl) on SDS-PAGE (4–20%).
posted December 2008
revised November 2013
Phospho-Akt (Ser473) (587F11) Mouse mAb detects endogenous levels of Akt only when phosphorylated at Ser473. This antibody does not detect Akt phosphorylated at other sites or related kinases such as PKC and p70 S6 kinase. This is a biotinylated version of the #4051 antibody and is expected to continue to recognize other species such rat and hamster.Species Reactivity: Human, Mouse, Rat, Hamster Species predicted to react based on 100% sequence homology: Monkey
Monoclonal antibody is produced by immunizing animals with a synthetic phosphopeptide corresponding to residues around Serine 473 of mouse Akt.
Akt, also referred to as PKB or Rac, plays a critical role in controlling survival and apoptosis (1-3). This protein kinase is activated by insulin and various growth and survival factors to function in a wortmannin-sensitive pathway involving PI3 kinase (2,3). Akt is activated by phospholipid binding and activation loop phosphorylation at Thr308 by PDK1 (4) and by phosphorylation within the carboxy terminus at Ser473. The previously elusive PDK2 responsible for phosphorylation of Akt at Ser473 has been identified as mammalian target of rapamycin (mTOR) in a rapamycin-insensitive complex with rictor and Sin1 (5,6). Akt promotes cell survival by inhibiting apoptosis through phosphorylation and inactivation of several targets, including Bad (7), forkhead transcription factors (8), c-Raf (9), and caspase-9. PTEN phosphatase is a major negative regulator of the PI3 kinase/Akt signaling pathway (10). LY294002 is a specific PI3 kinase inhibitor (11). Another essential Akt function is the regulation of glycogen synthesis through phosphorylation and inactivation of GSK-3α and β (12,13). Akt may also play a role in insulin stimulation of glucose transport (12). In addition to its role in survival and glycogen synthesis, Akt is involved in cell cycle regulation by preventing GSK-3β-mediated phosphorylation and degradation of cyclin D1 (14) and by negatively regulating the cyclin dependent kinase inhibitors p27 Kip1 (15) and p21 Waf1/Cip1 (16). Akt also plays a critical role in cell growth by directly phosphorylating mTOR in a rapamycin-sensitive complex containing raptor (17). More importantly, Akt phosphorylates and inactivates tuberin (TSC2), an inhibitor of mTOR within the mTOR-raptor complex (18,19).
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