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Immunoprecipitation

Immunoprecipitation

Immunoprecipitation (IP) is a technique used to enrich a specific protein from a heterogeneous cell or tissue extract using a target specific antibody. Co-immunoprecipitation (co-IP) is the pull down of intact protein complexes. IP and co-IP are valuable and widely used techniques to identify protein-protein interactions and novel members of protein complexes.

CST supplies high quality antibodies for IP and co-IP experiments that are validated using detailed protocols. The high degree of antibody specificity coupled with the availability of thoroughly validated companion products including IP beads and buffers ensure reliable IP and co-IP data to elucidate protein-protein interactions and protein complex composition. To save time and reagents, several antibodies are available conjugated to sepharose or magnetic beads for direct IP and co-IP experiments.

Custom conjugation of antibodies to sepharose and magnetic beads are available – please contact us for more information.

We offer a comprehensive list of companion products that are validated in-house with our protocols so that you can get all of the reagents you need to complete your experiment.

Companion Products for Immunoprecipitation:

Immunoprecipitation Data

Figure A. Immunoprecipitation of Neuropilin-1 from PC-3 cell extracts, in the absence of primary antibody (lane 2), using Neuropilin-1 (D62C6) Rabbit mAb #3725 lot 1 (lane 3), or Neuropilin-1 (D62C6) Rabbit mAb #3725 lot 2 (lane 4). Lane 1 is 10% input. Western blot analysis was performed using Neuropilin-1 (D62C6) Rabbit mAb #3725 lot 2.

Figure B. Immunoprecipitation of α-Synuclein from mouse brain tissue extracts, in the absence of primary antibody (lane 2), using α-Synuclein (D37A6) XP® Rabbit mAb #4179 lot 1 (lane 3), or α-Synuclein (D37A6) XP® Rabbit mAb #4179 lot 2 (lane 4). Lane 1 is 10% input. Western blot analysis was performed using α-Synuclein (D37A6) XP® Rabbit mAb #4179 lot 2. Mouse Anti-rabbit IgG (Conformation Specific) (L27A9) mAb #3678 was used to avoid recognition of rabbit IgG heavy and light chains by western blot.

Figure C. Immunoprecipitation of caspase-3 from extracts from Jurkat cells treated with Etoposide #2200 (25 µM, 5 hr) using Rabbit (DA1E) mAb IgG XP® Isotype Control #3900 (lane 2), Caspase-3 (8G10) Rabbit mAb #9665 lot 3 (lane 3), or Caspase-3 (8G10) Rabbit mAb #9665 lot 6 (lane 4). Lane 1 is 10% input. Western blot analysis was performed using Caspase-3 (8G10) Rabbit mAb #9665 lot 6. Mouse Anti-rabbit IgG (Conformation Specific) (L27A9) mAb #3678 was used to avoid recognition of rabbit IgG heavy and light chains by western blot.

Co-Immunoprecipitation Data

The co-immunoprecipitation data shown above is the pull-down of the mTORC1 complex using antibodies targeting various complex components including: GβL, mTOR, and Raptor. All data was generated using HeLa cell extracts and the antibodies indicated below. Lane 1 is 10% input, lane 2 is the pull-down.

Figure A. IP: GβL (86B8) Rabbit mAb #3274. Western Probe: mTOR Antibody #2972

Figure B. IP: mTOR Antibody #2972. Western Probe: Raptor (24C12) Rabbit mAb #2280

Figure C. IP: Raptor (24C12) Rabbit mAb #2280. Western Probe: GβL (86B8) Rabbit mAb #3274

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