Immunoprecipitation of RASSLs

Overview

List of reagents is not yet complete

Procedure

1. Add the following to the supernatant of the solubilized sample:

   * 2 ml of 1 M CaCl2
   * 2 ml of M1-Antibody (1mg/µl) (Eastman Kodak Co. #IB13007)
   * 15 ml of 50% suspension Prot-A agarose beads (Sigma # P-2545) *IP Standard, use 50 ng of a flag-tagged protein. 

2. Incubate overnight at 4°C on a rotator.

3. Spin down beads for 1 min at 4°C at 3,000 rpm.

4. Discard supernatant using a pipet or a vacuum. Be careful not to remove beads.

5. Add 1 ml of TBS-T Ca++ Wash buffer to beads. Invert tubes a few times and spin for 1 min at room temperature at 3,000 rpm.

6. Discard supernatant using a pipet or a vacuum.

7. Repeat wash (steps No. 5 and No. 6).

8. Add 50 ml of 1x electrophoresis sample buffer to beads.

9. Vortex. Boil sample for 5 minutes.

10. Vortex. Spin for 2 min at room temperature at 5,000 rpm.

11. Transfer supernatant to new tube using flat tips or load supernatant on gel using flat tips. Pipet carefully and try not to disturb bead pellet. Buffers TBS-T Ca++ Wash Buffer:

   * 1x TBS (50 mM Tris-HCl, pH 7.4, 150 mM NaCl)
   * 0.1% Tween-20
   * 1 mM CaCl2 

Sample Buffer:

   * 2x Tris-Glycine SDS Sample Buffer (Novex #LC2676) plus 5% beta-mercaptoethanol dilute to 1x with ddH20 
   Tribromoethanol is extremely light sensitive. Its degradative products, HBr and dibromylacetaldehyde, are both very toxic. 

Notes

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References

Relevant papers and books

If this protocol has papers or books associated with it, list those references here. Below is an example for formatting purposes. See the OpenWetWare:Biblio page for more information.

1. Goldbeter A and Koshland DE Jr. An amplified sensitivity arising from covalent modification in biological systems. Proc Natl Acad Sci U S A. 1981 Nov;78(11):6840-4. DOI:10.1073/pnas.78.11.6840 |
2. JACOB F and MONOD J. Genetic regulatory mechanisms in the synthesis of proteins. J Mol Biol. 1961 Jun;3:318-56. DOI:10.1016/s0022-2836(61)80072-7 |
3. ISBN:0879697164

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