In modern proteomics, molecular biology, and cell function research, tag-based protein purification and interaction analysis have become routine techniques. The Flag tag (DYKDDDDK), a small molecular affinity tag, offers advantages such as high expression efficiency, minimal structural interference, and strong recognition specificity, and is widely used in recombinant protein expression and functional studies.
To further enhance the specificity and efficiency of protein enrichment, bead-mediated immunoprecipitation (IP) and co-immunoprecipitation (Co-IP) have become common strategies. MtoZ Biolabs' anti-flag magnetic beads are specifically designed to recognize and capture Flag-tagged proteins, suitable for protein immunoprecipitation, co-immunoprecipitation, and small-scale purification experiments in bacterial, mammalian cell lysates, and in vitro translation systems, helping researchers efficiently analyze protein function and interaction networks.
Product Overview
MtoZ Biolabs' anti-flag magnetic beads are prepared by covalently coupling high-quality mouse-derived IgG1 monoclonal antibodies with amino-functionalized magnetic microspheres, specifically designed to recognize Flag-tagged (DYKDDDDK) fusion proteins. The product is a ready-to-use suspension with excellent dispersibility and magnetic responsiveness, enabling rapid binding to the target protein and efficient separation under magnetic force.
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Characteristics |
Description |
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Product content |
10 mg/ml magnetic beads in specific protective buffer |
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Beads size |
~200 nm |
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Magnetization |
Superparamagnetic |
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Coupled antibody |
Anti-Flag mouse monoclonal antibody |
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Isotype |
IgG2b |
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M.W. of antibody |
Approximately 150 kDa |
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Antibody concentration |
≥ 0.6 mg Flag antibody per ml beads |
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Binding capacity |
≥ 0.6 mg Flag-tagged fusion protein per ml beads |
The anti-flag magnetic beads offers strong batch-to-batch consistency, low background interference, and high protein recovery, making it suitable for various downstream analyses, including SDS-PAGE, Western Blot, enzymatic analysis, and mass spectrometry, among other technical platforms.
Protocol
1. Sample Preparation
Choose the appropriate lysis method based on the sample type (e.g., cell lysates, tissue homogenates, or in vitro expression products). It is recommended to use a buffer that does not contain strong detergents to preserve protein functionality.
2. Magnetic Bead Pre-treatment
a. Gently pipette and resuspend the Anti-Flag magnetic beads. For every 500 µL of sample, add 10 µL or 20 µL of magnetic bead suspension. Transfer the appropriate amount of Anti-Flag magnetic beads to a clean centrifuge tube, and add 1× TBS to a final volume of approximately 0.5 mL.
b. Gently pipette and fully resuspend the Anti-Flag magnetic beads. Place the tube on a magnetic rack for 10 seconds, and remove the supernatant. Repeat this step two more times.
c. Resuspend the Anti-Flag magnetic beads in 1× TBS according to the initial volume.
3. Protein Binding Reaction
a. Bead Addition and Incubation: For every 500 µL of protein sample, add 20 µL of Anti-Flag magnetic bead suspension. Place the tube on a rocking shaker or rotary mixer. Incubate at room temperature for 2 hours or at 4°C overnight.
b. Magnetic Separation: After incubation, place the tube on a magnetic rack for 10 seconds, and remove the supernatant.
c. Washing: Add 500 µL of 1× TBS, gently pipette to resuspend the Anti-Flag magnetic beads. Place the tube on a magnetic rack for 10 seconds, and remove the supernatant. Repeat this washing step three times.
4. Washing Process
Acidic Elution Method : This is a non-denaturing method that is quick and efficient. The eluted protein retains its biological activity, making it suitable for subsequent analysis and detection.
a. Solution Preparation: Acidic elution buffer (0.1M Glycine-HCl, pH 3.0), neutralizing buffer (0.5M Tris-HCl, pH 7.4, 1.5M NaCl).
b. For every 20 µL of original bead volume, add 100 µL of acidic elution buffer. Mix and incubate on a rocking shaker or rotary mixer at room temperature for 5 minutes.
Note: Do not incubate for more than 15 minutes.
c. After incubation, place the tube on a magnetic rack for 10 seconds, transfer the supernatant to a new centrifuge tube, and immediately add 10 µL of neutralizing buffer. Mix well.
d. To achieve maximum elution efficiency, you can repeat steps b and c, and combine the same samples.
e. The eluted and neutralized Flag-tagged proteins can be stored at 4°C for immediate use or long-term stored at -20°C or -80°C.
Features and Benefits
1. High Affinity and Specific Recognition
Conjugated with high-quality monoclonal antibodies, it precisely recognizes the Flag sequence, ensuring specific binding of the target protein.
2. Low Protein Loss
Optimized binding/elution conditions reduce protein loss and enhance experimental recovery rates.
3. Low Non-Specific Binding
The surface of the beads is fully blocked to minimize background interference, improving data reliability.
4. Simple and Efficient Operation
With fewer washing steps and a short operation time, it is compatible with various experimental workflows, saving time and effort.
5. Superior Binding Capacity
The protein binding capacity is up to 0.6 mg/mL, suitable for enriching low-abundance samples.
6. Stable Storage, Long-lasting Performance
Can be stored at 4°C for up to 2 years while maintaining stable binding performance.
Applications
Anti-Flag magnetic beads are suitable for a wide range of applications and are of significant value in tagged protein analysis and protein interaction studies. Common applications include:
1. Protein Expression Verification and Small-Scale Purification
Conveniently obtain target Flag-tagged proteins for functional validation, antibody production, and more.
2. Immunoprecipitation (IP) Experiments
Enrich Flag fusion proteins for detection methods such as Western blot, mass spectrometry, etc.
3. Co-immunoprecipitation (Co-IP) Experiments
Combine with interaction protein identification to assist in constructing protein interaction maps.
4. Protein Function and Enzyme Activity Analysis
Retain protein biological activity under mild elution conditions, suitable for activity testing.
5. Low Abundance Protein Pre-enrichment
Enhance detection sensitivity and optimize downstream analysis results.
MtoZ Biolabs has always focused on the research and supply of protein sample preparation consumables, dedicated to providing high-quality, stable, and easy-to-use laboratory tools for researchers. With its high affinity, low background, good versatility, and batch-to-batch consistency, the Anti-Flag magnetic beads have become the preferred enrichment tool in many research projects.
If you are looking for a reliable solution for tagged protein enrichment, feel free to contact MtoZ Biolabs for more product information and technical support.
FAQs
Q1: Is Anti-Flag magnetic beads Suitable for Bacterial Lysate?
A1: Yes, Anti-Flag magnetic beads are suitable for Flag-tagged protein enrichment in bacterial, mammalian cell lysates, and in vitro expression systems.
Q2: Does Bead Aggregation Affect the Binding Efficiency?
A2: No, bead aggregation or sheet-like structures are normal physical phenomena and will not affect the binding efficiency or experimental results.
Q3: Can It Be Used for Subsequent Functional Experiments?
A3: Yes, acid or competitive elution protocols can be used to retain protein activity, allowing for subsequent functional experiments.
Q4: Is It Recommended to Reuse the Beads?
A4: It is recommended to use the beads once to ensure binding efficiency and experimental stability. If reuse is necessary, the elution and regeneration process should be optimized, and the binding performance should be verified.
Q5: How to Determine If Washing Is Sufficient?
A5: The wash can be assessed by measuring the OD280 value of the supernatant. An OD280 value of <0.05 is recommended. If higher, increase the number of washing steps.
Q6: How to Address Non-Specific Binding of Beads?
A6: Pre-blocking the beads with 3% BSA before binding, incubating at room temperature for 15-30 minutes, can help reduce non-specific binding and increase the purity of the target protein.
