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Protein Protocols Protein Protocols

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Phosphopeptide Mapping 677<br />

Fig. 1. The location of the origin, anode, cathode, and color dye marker dye relative to each other<br />

on the 20 × 20 cm TLC plate are depicted (see Subheading 3.4., steps 1 and 2).<br />

3. Place the loaded TLC plate on top of the cooling plate. To dampen the TLC plate with<br />

buffer, first cut a 21 × 21-cm piece of Whattman 3MM paper, and make an approx 1-cm<br />

hole at the origin by puncturing the 3MM paper with a pencil. Soak the cut 3MM paper in<br />

pH 1.9 running buffer, blotting it between two sheets of dry 3MM paper, and then placing<br />

it over the loaded TLC plate sitting on top of the cooling plate. Slowly pipet running<br />

buffer onto the 3MM paper until the entire cellulose plate is damp beneath, avoiding<br />

excessive puddling. Remove the paper, and wick a single piece of 13 × 21 cm buffersoaked<br />

3MM filter paper from the buffer chamber onto the 2-cm outer edge on both sides<br />

of the plate (see Fig. 2). Be sure to fold the paper neatly over the edge of the cooling plate,<br />

and make sure that it is evenly contacting the TLC plate. Place the glass cover over<br />

the TLC plate touching/resting on the 2-cm overhang of the 3MM paper wicks. Attach the<br />

Multiphor II cover.<br />

4. Electrophorese the peptides on the loaded TLC plate at 1000-V constant for 28–30 min. The<br />

run time may be increased up to 38 min. If further separation of 32 P-labeled peptides in this<br />

dimension is required, the run time may be increased up to 38 min.<br />

5. Following the first-dimension separation by electrophoresis, remove the TLC plate from<br />

the Multiphor II apparatus, and dry for 1 h with a fan.<br />

6. Place the TLC plate on a stand in a thin-layer chromatography chamber pre-equilibrated<br />

for 48 h in chromatography buffer. The TLC buffer should cover approx 1 cm of the<br />

bottom of the TLC plate when placed on the stand. Leave the TLC plate in the chamber

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