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Immunoprecipitation troubleshooting tips

Related

  • IP resources
    • Webinar: Introduction to IP
      • Webinar: Advanced IP
        • General IP protocol
          • Cross-linking X-ChIP protocol
            • RNA IP (RIP) protocol
              • Webinar: Introduction to ChIP
                • UV cross-linking and IP protocol (CLIP)
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                    ​​Detailed troubleshooting for immunoprecipitation. 

                    Print this protocol.

                    High background

                    Carry over of proteins that are not detergent soluble
                    Remove supernatant immediately after centrifugations. This should leave insoluble proteins in the pellet. If resuspension occurs, centrifuge again.

                    Incomplete washing
                    Wash well at relevant stages by placing a lid on the tube and inverting several times before centrifuging.

                    Non-specific proteins are binding to the beads
                    Beads are not pre-blocked enough with BSA. Make sure BSA (fraction V) is fresh and incubate fresh beads for 1 hr with 1% BSA in PBS. Wash 3-4 times in PBS before using them.

                    Antibody used contains antibodies that are not specific enough
                    Use an affinity purified antibody, preferably pre-adsorbed.

                    Too much antibody used leading to non-specific binding
                    Check the recommended amount of antibody suggested. Try using less antibody.

                    Too many cells/too much protein in lysate leading to a lot of non-specific proteins in eluate
                    ​Reduce the number of cells/lysate used. We recommend using 10-500 µg cell lysate.

                    Non-specific binding of proteins to antibody
                    If there are many proteins binding non-specifically, then try reducing the amount of sample loaded onto the beads. You can also pre-clear the lysate by pre-incubating the prepared lysate with the beads before commencing with the immunoprecipitation (please see the protocol). This should clear the lysate of any proteins that are binding non-specifically to the beads. Some researchers also use an irrelevant antibody of the same species of origin and same Ig subclass to pre-clear the lysate.

                    Antigen degrading during immunoprecipitation
                    ​Ensure fresh protease inhibitors are added when sample is lysed.

                    High amount of antibody eluting

                    Too much antibody eluting with the target protein
                    Try reducing the amount of antibody. Crosslinking the antibody to the beads before the immunoprecipitation and eluting using a gentle glycine buffer gradient should significantly reduce the amount of antibody eluted.
                    ​

                    No eluted target protein detected

                    Target protein not expressed in sample used/low level of target protein expression in sample used
                    Check the expression profile of the target protein to ensure it will be expressed in the cells of your samples. If there is low level of target protein expression, increase the amount of lysate used. However, this may result in increased non-specific binding so it would be advisable to pre-clear the lysate before commencing with the IP procedure.

                    Insufficient antibody for capture of the target protein
                    Check that the recommended amount of antibody is being used. The concentration of antibody may require increasing for optimization of results.

                    Target protein has not eluted from the beads
                    Ensure you are using the correct elution buffer and that it is at the correct strength and pH for elution of the protein.

                    Antibody has not bound to immunoadsorbant beads
                    Ensure you are using the correct beads for the antibody isotype used.

                    Incorrect lysis buffer used
                    Check datasheet to see if the antibody detects denatured or native protein and ensure the correct lysis buffer is used. See our immunoprecipitation protocol.

                    Protein of interest is obstructed by antibody heavy or light-chains

                    Secondary antibody recognizes denatured/reduced primary antibody released during the IP procedure or endogenous IgGs
                    Using secondary antibodies, recognizing the heavy and light-chain of the primary antibody for WB detection of IP samples will always result in two bands (the heavy-chain at 50kDa and the light-chain at 25kDa).
                    To avoid interference by the antibody chains we recommend using secondary antibodies, such as  VeriBlot for IP, that specifically recognize native (non-reduced) primary antibodies.

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