The Anti-c-Myc resin provided in this kit is a 50% gel suspension, with the packaging volume referring to the total volume. Each milliliter contains 0.5 ml of pure gel (precipitate). For routine immunoprecipitation experiments, use 20 μl of gel suspension per 250 μg of sample.
Precautions
1. Anti-c-Myc resin usage should be optimized based on experimental requirements.
2. Before performing protein‑protein interaction operations, be sure to read this manual carefully.
3. Unless otherwise specified, all steps are recommended to be performed at 4 °C to minimize potential protein degradation. If cell lysis is insufficient, sonication may be used after adding the lysis buffer.
4. The resin should be stored in the storage solution and protected from drying. Mix thoroughly before use.
5. Anti-c-Myc resin that have been boiled lose their binding capacity and should not be reused.
6. This product is intended for research use by qualified professionals only.
7. Please follow safety guidelines and adhere to laboratory reagent handling protocols.
8. The lysis buffer included in this kit already contains protease inhibitors. If special needs arise, other appropriate inhibitor cocktails may be considered.
9. Anti-c-Myc resin must be fully resuspended before use, i.e., invert the tube several times to ensure thorough mixing.
10. After collection, protein samples should be purified as soon as possible and always kept at 4 °C or on ice to slow down protein degradation or denaturation.
Procedure (Unless otherwise specified, all procedures should be performed at 4°C)
1. Reagent Preparation
The following reagents and materials that may be required for the experiment are not provided and need to be prepared separately:
(1) Reagents to be prepared by the user:
a) Primary Antibody: Myc tag antibody
b) Secondary Antibodies: Goat Anti-Mouse IgG H&L (HRP), Goat Anti-Rabbit IgG H&L (HRP)
c) Other Reagents: TBST, Electrophoresis Buffer, Transfer Buffer, Reducing SDS-PAGE Gel
(2) Required Equipment:
Electrophoresis Apparatus, Transfer Apparatus, Imaging System
The above reagents, if required, can be ordered from Aladdin: Rabbit anti Myc tag Antibody ( Ab116628 )、 Mouse anti Myc tag Antibody ( Ab116621 )、Goat Anti-Rabbit IgG H&L (HRP) ( Ab176443)、 Recombinant Protein A/G, HRP conjugate(rp303272)、Goat Anti-Mouse IgG H&L (HRP) (Ab179001)
2. Solution Preparation
Buffering agents provided in the kit can be used, or alternatively, different buffer systems can be prepared according to actual requirements. It is recommended that all buffers be filtered through a 0.22 μm or 0.45 μm membrane prior to use. Buffers should be stored at 4°C. Discard immediately if the reagent appears turbid.
a) Prepare an appropriate amount of inhibitor-containing lysis buffer based on the proportion of using 100-200 μl of inhibitor-containing lysis buffer for lysis and 300–600 μl of inhibitor-containing lysis buffer for washing per 0.5 -1 million cells. Mix Lysis Buffer and Protease Inhibitor Cocktail (100x) at a ratio of 100:1. For example, add 10 μl of Protease Inhibitor Cocktail (100x) to 1 ml of Lysis Buffer to obtain 1 ml of inhibitor-containing lysis buffer (Lysis Buffer with Protease Inhibitor Cocktail). The prepared inhibitor-containing lysis buffer should be placed on ice or at 4°C.
Note: The inhibitor-containing lysis buffer should be prepared fresh before use and should not be frozen and stored for later applications.
b) Preparation of c-Myc Peptide Elution Buffer (10 mg/mL): Dilute a certain amount of the c-Myc peptide stock solution with wash buffer to a final concentration of 150 μg/mL. For instance, add 1.5 μL of the peptide to 98.5 μL of wash buffer and mix well to achieve a final concentration of 150 μg/mL. Adjustments can be made according to experimental requirements.
c) Preparation of 10x Wash Buffer: Dilute the 10x wash buffer with deionized water at a 9:1 ratio. For example, add 9 mL of deionized water to 1 mL of 10x wash buffer, and mix well to obtain the 1x wash buffer.
d) Resin Washing: Gently resuspend the Anti-c-Myc Resin to form a homogeneous gel suspension. Typically, use 20 μl of the well-mixed gel suspension per 250 μg (the following immunoprecipitation steps are described based on adding 20 μl of gel suspension per sample). Transfer an appropriate amount of Anti-c-Myc Resin into a clean centrifuge tube, and add 1x wash buffer to a final volume of approximately 0.5 mL. Repeat the above steps twice.
3. Preparation of Test Samples (Note: Perform all sample lysis steps at 4°C or on ice)
a) For the preparation of serum samples:
If the target protein is abundant, dilute the serum sample with Lysis Buffer to a final target protein concentration of 50–150 µg/mL. Keep the diluted sample on ice for immediate use or store at -20°C for long-term preservation.
b) For Adherent Cell Lysis and Preparation:
Aspirate the culture medium and wash the cells twice with PBS. Remove all residual liquid completely. Add 100-200 µL of Lysis Buffer with inhibitors per 0.5-1 million cells (equivalent to one well of a 6-well plate). Pipette gently to ensure thorough contact between the lysis buffer and cells. Animal cells are typically lysed within 1-2 seconds of contact with the buffer. For plant cells, lyse on ice for 2-10 minutes. After complete lysis, use a cell scraper to detach the cells and transfer the lysate to a 1.5 mL microcentrifuge tube. Centrifuge at 10,000-14,000 × g for 3-5 minutes at 4°C. Collect the supernatant for protein concentration determination before proceeding to subsequent immunoprecipitation or co-immunoprecipitation experiments.
Note: A small amount of insoluble material, primarily genomic DNA, may be present after lysis and will form a pellet upon centrifugation.
c) For Suspension Cell Lysis and Preparation:
Collect cells by centrifugation at 250-1,000 × g for 5 minutes at room temperature. Wash the pellet twice with PBS and remove all residual liquid completely. Gently vortex or tap the tube to disperse the cells. Add 100-200 µL of Lysis Buffer with inhibitors per 0.5-1 million cells. Mix and incubate on ice for 5-20 minutes (mix several times during incubation). Tap the tube or pipette gently to ensure complete cell lysis; no significant cell pellet should remain after thorough lysis. If processing a large number of cells, it is recommended to aliquot them into tubes containing 0.5-1 million cells per tube before lysis. Large cell clumps are more difficult to lyse completely, whereas smaller numbers of cells allow better contact with the lysis buffer and lyse more efficiently. After complete lysis, centrifuge at 10,000-14,000 × g for 3-5 minutes at 4°C. Collect the supernatant for protein concentration determination before subsequent immunoprecipitation or co-immunoprecipitation experiments.
Note: A small amount of insoluble material, primarily genomic DNA, may be present after lysis and will form a pellet upon centrifugation.
d) For Bacterial or Yeast Sample Lysis and Preparation:
For 1 mL of bacterial or yeast culture, centrifuge to pellet the cells and remove the supernatant. Wash the pellet twice with PBS and remove all residual liquid completely. Gently vortex or tap the tube to resuspend and disperse the bacterial or yeast cells. Add 100-200 µL of Lysis Buffer with inhibitors. Gently vortex or tap the tube to mix, and lyse on ice for 2-10 minutes. For improved lysis efficiency, bacteria and yeast can be pretreated with lysozyme and lyticase, respectively, before adding the Lysis Buffer with inhibitors. After complete lysis, centrifuge at 10,000-14,000 × g for 3-5 minutes at 4°C. Collect the supernatant for protein concentration determination before subsequent immunoprecipitation or co-immunoprecipitation experiments.
Note: A small amount of insoluble material, primarily genomic DNA, is likely present after lysis and will form a pellet upon centrifugation.
e) For Tissue Sample Lysis and Preparation:
Mince the tissue into small fragments. Add approximately 100-200 µL of Lysis Buffer per 20 mg of tissue. Homogenize the mixture using a glass homogenizer or other suitable homogenization device. Thorough homogenization ensures complete tissue lysis. After lysis, centrifuge at 12,000 × g for 5 minutes at 4°C. Collect the supernatant for protein concentration determination before subsequent immunoprecipitation or co-immunoprecipitation experiments.
Note: A small amount of insoluble material, primarily genomic DNA, is likely present after lysis and will form a pellet upon centrifugation.
4. Immunoprecipitation (IP)
a）Add Resin and Incubate: Add the magnetic beads to the protein sample at a ratio of 20 µL bead suspension per 250 µg of protein sample. Place the tube on a rocking platform or rotator and incubate at room temperature for 2 hours or at 4°C overnight.
b) centrifugal separation: After incubation, Centrifuge at 2000 rpm for 2 minute at 4°C. Wait until all resin are captured, then transfer the supernatant to a new centrifuge tube. Retain this supernatant for potential future analysis.
c) Washing: Add 0.5 mL of Wash Buffer containing inhibitors and gently resuspend the beads by pipetting. Centrifuge at 2000 rpm for 2 minute at 4°C, then remove and discard the supernatant. Repeat this wash step three times using Lysis Buffer with inhibitors. This yields the bait protein-resin complex.
Note: The completeness of washing can also be assessed by measuring the OD280 of the wash supernatant. If the OD280 is greater than 0.05, appropriately increase the number of washes.
5. Protein Elution
Depending on the characteristics of the tagged protein and the requirements of subsequent experiments, choose one of the following three methods for elution.
a) Peptide Competitive Elution
Add 100 µL of c-Myc Peptide Elution Buffer per 20 µL of original resin volume. Mix well and place the tube on a rocking platform or rotator. Incubate with shaking at room temperature for 30-60 minutes, or at 4°C for 1-2 hours. To improve elution efficiency, the incubation time can be extended or the elution step can be repeated. Gently mix 3-5 times during incubation. After incubation, Centrifuge at 2000 rpm for 2 minute at 4°C. The His‑tagged protein and its complexes can be stored at 4 °C for immediate use, or at –20 °C/–80 °C for long‑term storage. Once the beads are fully captured, aspirate the supernatant into a new centrifuge tube for Western Blot analysis.
b) SDS-PAGE Loading Buffer Elution
Add 30 µL of PBS (self-prepared) per 20 µL of original bead volume to resuspend the beads. Then add 30 µL of 2 x SDS Loading Buffer. Mix gently by shaking, then heat at 95-100°C for 5-10 minutes. Centrifuge at 2000 rpm for 2 minute a, and collect the supernatant for SDS-PAGE electrophoresis or Western Blot analysis.
Note: Elution with SDS-PAGE Loading Buffer enables complete detachment of the target protein from the beads, but the antibody will also be completely eluted. The Anti-c-Myc antibody on the resin is mouse-derived; therefore, it is recommended to select a rabbit antibody for the subsequent WB experiment. The recommended loading volume for Western Blot detection is within 20 µL. The remaining sample can be stored frozen at -20°C.
c) Acid Elution
Add 100 µL of Acid Elution Buffer per 20 µL of original bead volume. Mix well and place the tube on a rocking platform or rotator. Incubate at room temperature for 5 minutes. Centrifuge at 1000 rpm for 1 minute at 4°C, then transfer the supernatant to a new centrifuge tube. If neutralization is required, add 10 µL of Neutralization Buffer to adjust the pH to neutral.
Note 1: Although efficient, acid elution may still be less effective than competitive elution or SDS-PAGE loading buffer elution.
Note 2: As differences in target proteins may influence the efficiency of acid elution, if high elution efficiency is required, the pH of the Acid Elution Buffer can be adjusted within the range of 2.5-3.0; correspondingly, the pH or volume of the Neutralization Buffer should also be adjusted. Specific experimental conditions need to be optimized by the user. Alternatively, consider using the potentially more efficient c-Myc Peptide Competitive Elution method or the expected highest efficiency SDS-PAGE Loading Buffer Elution method. The disadvantage of the latter is that elution occurs under denaturing conditions, which may impact subsequent experiments requiring protein activity.
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