Anti-Flag magnetic beads(IC-8115)

Description

Anti-Flag magnetic beads is based on hydroxyl magnetic beads covalently coupling with high quality recombinant mouse monoclonal antibody. With high loading of Flag-tagged protein (more than 1.1 mg protein/mL) and high specificity, it is recommended to use for co-immunoprecipitation and protein purification.

Size

0.5ml; 1ml; 2ml; 5ml

Storage

Store at 2-8¡ãC for 2 years. DO NOT freeze or centrifuge Magnetic Beads.

Protocol

Magnetic Beads Preparation

1. Suspend the Anti-Flag magnetic beads in the vial (pipet gently for 10 times, don¡¯t vortex). Transfer 10 ¦ÌL (the amount may be scaled up or down as required) Anti- Flag Magnetic Beads suspension to a new tube.

2. Add 0.5 mL TBS buffer (50 mM Tris HCl, 150 mM NaCl, pH 7.4). Pipet gently for 5 times Anti-Flag magnetic beads. Place the tube on the magnet to separate the beads from the solution for 10 sec and remove the supernatant. Repeat this step for 2 times.

Note£ºDuring the binding process, it won''''''''''''''''t affect the result if magnetic beads occasionally cluster together.

Protein Binding

3. Add 500 ¦ÌL of cell lysate to the washed magnetic beads. Gently rotate the tube for 2 h at room temperature or over night at 4¡ãC.

4. Place the tube on the magnet to separate the beads from the solution for 10 sec and then transfer the supernatant into a new tube for detecting whether Flag-tag protein is residual.

Note: Prepare all Magnetic Beads together in one large tube and then divide it into aliquots if samples are in batch.

5. Add 500 ¦ÌL PBST to the tube (NaCl 136.89 mM; KCl 2.67 mM; Na2HPO4 8.1 mM; KH2PO4 1.76 mM£»0.5% Tween20), resuspend the magnetic beads by pipeting gently. Then rotate the tube for 5 min. Place the tube on the magnet to separate the beads from solution for 10 sec and remove the supernatant.

6. Repeat step 5 for about 2 times. If the non-specific impurity proteins are left over, please extend the cleaning time, increase the cleaning times or properly enlarge the detergent content in the cleaning solution.

Elution and Detectione

Choose different elution methods according to the downstream use. For IP, go to the step 7-8. For protein purification, go to step 9-10 for low pH elution.

Denaturing elution (suitable for IP experiments using Anti-Flag beads):

7. For direct detection of target proteins, add 50 ¦ÌL 1¡Áprotein sample loading buffer in the precipitation mentioned above, boil for 5 min, chill to room temperature and then place the tube on the magnet to separate the beads from the solution for 10 sec.

8. Detect the supernatant by SDS-PAGE.

Competitive poly FLAG polypeptide elution (Suitable for protein purifications by

Anti-Flag beads):

9. Add the TBS buffer with 200 ¦Ìg-1 mg/mL Poly FLAG Peptide (B23111) into the product of step 6, and then incubate them at shaker (4¡ãC) for 2 h. Generally, the volume of Poly FLAG Peptide is 5 times of the gel.

10. Place products of the above step on the magnet separation for magnetic separation. Transfer the supernatant containing target protein into a new EP tube. If needing reuse the magnetic beads, please clean the gel with 0.1 M glycine HCl (pH 3.0) and carry out recycling.

Low-pH elution (Suitable for protein purification by Anti-Flag beads):

11. Add the 0.1 M glycine HCl (pH 3.0) elution buffer into the product of step 6, and incubate at shaker for 5 min (The elution time should be less than 20 min). Generally, the volume of elution buffer is 5 times of the gel.

12. Centrifugation the products obtained from the above step at 5000 rpm for 30 sec. Then transfer the elution product quickly into 1 M Tris (pH 8.0) for neutralization until the pH is near neutral.

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