SDS

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SDS-PAGE PROTOCOL
Adapted from Current Protocols, Ch. 10
Veena Mandava

Materials
To Pour Gels:
30% acrylamide
10% SDS
10% APS (make fresh each time)
TEMED
1.5 M Tris, pH 8.8 (resolving gel)
1.0 M Tris, pH 6.8 (stacking gel)
5x SDS Running Buffer (1 L)
Tris 15 g
Glycine 72 g
SDS 5 g
Coomassie Blue Stain
10% (v/v) acetic acid
0.006% (w/v) Coomassie Blue dye
90% ddH2O
Isopropanol Fixing Solution
10% (v/v) acetic acid
25% (v/v) isopropanol
65% ddH2O
SDS sample loading buffer (40 ml)
ddH2O 16 ml
0.5 M Tris, pH 6.8 5 ml
50% Glycerol 8 ml
10% SDS 8 ml
2-βmercaptoethanol 2 ml (add immediately before use)
bromophenol blue
10% (v/v) acetic acid

Protocol
1. Prepare polyacrylamide gel according to standard protocol.
2. Load samples and run gel @ 25 mA (2 gels run @ 50 mA) in 1x SDS Running Buffer.
3. At this point, the gel can either be transferred to a membrane (see Western protocol) or stained with Coomassie (see below).
4. Place gel in a plastic container. Cover with isopropanol fixing solution and shake at room temperature. For 0.75 mm-thick gels, shake 10 to 15 min; for 1.5 mmthick gels, shake 30 to 60 min.
5. Pour off fixing solution. Cover with Coomassie blue staining solution and shake at RT for 2 hr.
6. Pour off staining solution. Wash gel with 10% acetic acid to destain, shaking at RT ON.

western blot
Adapted from protocol accompanying Hybond ECL Membrane
Materials
Transfer Buffer
1x SDS Running Buffer in 20% Methanol
1x PBS /0.1% Tween 20
Blotting buffer, store at 4 ºC
5% milk in 1x PBS /0.1% Tween 20

Protocol
1. Run SDS-PAGE .
2. Wet membrane in H2O. Soak membrane in transfer buffer for 10 min.
3. Set up transfer from the gel to a nylon membrane in transfer buffer.
4. Place “transfer sandwich” in semi-dry transfer chamber. Run at 23 V for 30 min for 0.75 and 1.0 mm gels or 40 min for 1.5 mm gel.
5. Block blot by soaking in blotting buffer for 1 hr with shaking. Alternatively,blocking can be done with as much as 10% milk and 0.5% Tween 20 to reduce background.
6. To 10 ml blocking solution, add primary antibody at proper dilution. Incubate the membrane for 1 hr with shaking. Alternatively, incubation with 1º Ab can be done ON @ 4 ºC,
7. Wash 2x briefly with PBS-T, then wash 3x with PBS-T for 5 min.
8. To 10 ml PBS-T, add secondary antibody at proper dilution. Incubate the membrane for 1 hr with shaking.
9. Wash 2x briefly with PBS-T, then wash 3x with PBS-T for 5 min.
10. Detection by ECL. Expose blot to film for 15 sec – 5 min.

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