- Lyse the PBS-washed cell with 5% SDS.
- Sonicate sample briefly or pass it several times through a 21-gauge needle.
- Centrifuge sample at 4°C for 10 minutes to pellet insoluble material.
- Determine protein concentration and dilute protein sample in 1 x SDS sample buffer
(62.5 mM Tris pH 6.8, 2% SDS, 10%glycerol, 0.0005% bromophenol blue, 1.5%
DTT).
- Denature proteins by boiling sample for 3 minutes.
Load 50 μg/lane of protein in polyarylamide gel
- Add approximately 400 mL 1X Tris/Glycine/SDS running buffer to the lower
chamber of the cell. Snap the lid on the chamber and plug the leads into the power
source. Apply a constant voltage of 200 V for 55 minutes.
- Make a sandwich composed of filter paper-gel-blot (PVDF or nitrocellulose)-filter
paper, and place in electric field where negatively charged proteins migrate out of gel
onto blot. Apply current (60-70V) according to recommended time.