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Investigating Bak/Bax activating conformation change by immunoprecipitation
1Cell Signalling and Cell Death Division, Walter and Eliza Hall Institute of Medical Research, Parkville, Melbourne, Victoria 3052, Australia;Department of Medical Biology, The University of Melbourne, Melbourne, Victoria 3010, Australia.
Cold Spring Harbor Protocols
|May 3, 2015
Summary
Investigating apoptosis requires specific detergents for accurate immunoprecipitation (IP). CHAPS is ideal for detecting conformation changes in Bax and Bak, while Triton X-100 serves as a positive control for IP assays.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Apoptosis involves critical conformational changes in proteins like Bax and Bak.
- Immunoprecipitation (IP) is a key technique for studying protein interactions and conformations.
- Detergent choice is crucial in IP to avoid artifactual protein conformational changes.
Purpose of the Study:
- To identify detergents suitable for studying Bax and Bak conformational changes during apoptosis via IP.
- To establish reliable IP methods for analyzing apoptotic protein conformations.
- To validate the use of specific detergents as controls in apoptosis research.
Main Methods:
- Immunoprecipitation (IP) assays were performed using conformation-specific antibodies for Bax and Bak.
- Cells were treated with either CHAPS or Triton X-100 detergents.
- Comparison of IP results between non-apoptotic and apoptotic cells under different detergent conditions.
Main Results:
- CHAPS detergent allowed IP of conformation-specific Bax and Bak only after apoptotic stimulus.
- Triton X-100 enabled IP of Bax and Bak from both non-apoptotic and apoptotic cells.
- This highlights CHAPS's utility in detecting apoptosis-induced conformational shifts and Triton X-100's role as a positive control.
Conclusions:
- CHAPS is a suitable detergent for investigating Bax and Bak conformational changes during apoptosis via IP.
- Triton X-100 serves as an effective positive control for IP experiments in apoptosis studies.
- The choice of detergent significantly impacts the interpretation of IP results related to protein conformation.
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