Homogenization and Solubilization of RASSLs

1. Place 1 ml of homogenization buffer in a round bottom 14 ml tube.

2. Transfer the frozen tissue into the 14 ml tube. Homogenize using a homogenizer at max speed until tissue is fully ground (about 30-60 seconds).

3. Pipet the homogenate to an eppendorf tube and immediately place it on ice.

4. If the homogenate is too viscous, sonicate for 3-5 seconds.

5. Normalize samples by tissue weight and use approximately 10-50 mg of tissue for solublization.

6. Solublize each sample in an eppendorf tube using the following conditions:

   * 1x SSB
   * 1x Triton-X 100
   * 1x CompleteTM Cocktail (Protease Inhibitor, Boehringer #1697498) 

Example:

x ml of homogenate (~10-50 mg tissue)

   100 ml 10x SSB  
   100 ml 10% Triton-X 100 
   100 ml 10x Complete TM cocktail 
   1000 ml (adjust volume using ddH20)

7. Incubate for 30 min at 4°C on a rotator.

8. Spin for 5 min at 4°C at max speed.

9. Transfer supernatant to a new eppendorf tube.

   Buffers Homogenization Buffer

       * 50mM Tris-HCl, pH 7.4
       * 1x CompleteTM Cocktail
       * *1mM DTT
       * *1mM PMSF
       * in dd H20 

   *unstable in water, therefore, use buffer within 30 min after addition of PMSF, DTT
   10x CompleteTM Cocktail

       * Dissolve 1 tablet (Cat# 1697498) in 5 ml H2O 

   10x SSB

       * 100 mM Tris-HCl, pH 7.4
       * 1.5 M NaCl