High resolution of proteins by double-inverted gradient polyacrylamide gel electrophoresis (DG-PAGE)
We have designed a new method for high resolution electrophoretic separation of proteins that have similar molecular weights. The proteins migrate first through a conventional gradient gel, in which molecular friction increases as pore size decreases. The proteins then enter an inverted sodium dodec...
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Published in | BioTechniques Vol. 16; no. 2; p. 270 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
England
01.02.1994
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Subjects | |
Online Access | Get more information |
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Summary: | We have designed a new method for high resolution electrophoretic separation of proteins that have similar molecular weights. The proteins migrate first through a conventional gradient gel, in which molecular friction increases as pore size decreases. The proteins then enter an inverted sodium dodecyl sulfate (SDS) gradient gel in which friction decreases; thus, smaller molecules gradually migrate faster and achieve improved separation from larger molecules, which remain near the border between the two gels. We therefore call this technique double-inverted gradient polyacrylamide gel electrophoresis (DG-PAGE). This technique was used to resolve mixtures of aldolase, horseradish peroxidase precursors, glucose 6-phosphate dehydrogenase and pyruvate kinase. By comparison with other established methods, we show that DG-PAGE has a higher resolving power, which achieves clear separation of proteins differing as little as 0.5 kDa in molecular weight. |
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ISSN: | 0736-6205 |