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Western Blot Analysis

Sample Preparation:

1. Heat samples in Laemmli buffer at 70°C – 90°C for 10 min.
2. Load 80-100 μg/lane of membranes/lysates sample or 2-5×10cell lysate/lane.
3. Perform SDS-PAGE according to standard protocols.

Transfer:

Perform transfer according to the manufacturer’s instructions.
Note: High molecular weight proteins may need longer transfer time (see western blot analysis for high molecular weight proteins)

Western blot:

1. Block membranes with blocking solution (3% BSA in PBS, 0.05% NaN3) for 2-5 hr at room temperature with gentle agitation.
2. Add primary antibody diluted in PBS with 1% BSA, 0.1% Tween-20 and 0.05% NaN3  at the appropriate dilution. Incubate for 2-3 hr at room temperature or overnight at 4°C with gentle agitation. (If negative control antigen is used, refer to Negative Control Antigen Manipulation protocol).
3. Discard primary antibody and wash membranes by incubating with washing buffer (PBS + 0.1% Tween-20) 3 times for 15 min at room temperature.
Note: Do not use solutions containing NaN3 from this point on if you are using a secondary antibody conjugated to horseradish peroxidase (HRP).

4. Incubate secondary antibody at appropriate dilution in PBS with 1% BSA, 0.1% Tween-20 for 1 hr at room temperature with gentle agitation.
5. Wash membranes with washing buffer 3 times for 15 min at room temperature.
6. Proceed to detection using an ECL system. If using a commercial kit, perform according to the manufacturer’s instructions.
7. Exposure time to film/imager depends on the abundance of the protein and the detection system.

 

Buffers & Solutions

Blocking solution:
PBS (Phosphate Buffer Saline)
3% BSA
0.05% NaN3

 

 

Washing buffer:
Washing buffer
0.1% Tween-20

 

Primary antibody solution:
PBS
1% BSA
0.1% Tween-20
0.05% NaN3

 

 

Secondary antibody solution:
PBS
1% BSA
0.1% Tween-20