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Protein Protocols Protein Protocols

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84 Akins and Tuan<br />

Fig. 1. Diagram of the use of an SDecS Gel System. The cell homogenate, nuclear extract, or<br />

another mixture of proteins is combined in a 1:1 ratio (v:v) with 2× Sample Buffer. After<br />

solubilization, any debris is centrifuged, and the sample is separated by electrophoresis on a<br />

polyacrylamide gel. The gel is then cut into strips, and the protein bands are identified by CBB<br />

staining or binding to labeled probe.<br />

Fig. 2. Example mobility plot. Graph of the distance migrated in an SDecS gel relative to the<br />

salt front as a function of protein molecular weight. The proteins (M r in kDa) included:<br />

α-macroglobulin (211); β-amylase (200); alcohol dehydrogenase (150); β-galactosidase (119);<br />

fructose-6-phosphate kinase (98); pyruvate kinase (80.6); bovine serum albumin (66 and 132);<br />

fumarase (64.4); ovalbumin (45 and 90); lactate dehydrogenase (44.6); triosephophate<br />

isomerase (38.9). R 2 = 0.99.

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