SDS-PAGE — LLMpedia

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SDS-PAGE SDS-PAGE is a laboratory technique for separating proteins by molecular mass using polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate. It is widely used in National Institutes of Health, European Molecular Biology Laboratory, Howard Hughes Medical Institute, Cold Spring Harbor Laboratory research and teaching laboratories affiliated with institutions such as Harvard University, Massachusetts Institute of Technology, Stanford University, University of Cambridge, and University of Oxford. The method underpins workflows in projects at organizations like Biotechnology and Biological Sciences Research Council, Wellcome Trust, Gates Foundation, Bill & Melinda Gates Foundation, and World Health Organization-funded initiatives.

Overview

SDS-PAGE separates polypeptides by denaturing proteins with sodium dodecyl sulfate and resolving them through a polyacrylamide matrix driven by an electric field, following approaches refined in labs at Max Planck Society, Karolinska Institutet, Johns Hopkins University, Columbia University, and University of California, Berkeley. Core components and conventions were standardized in protocols disseminated by entities like American Chemical Society, American Society for Biochemistry and Molecular Biology, Cold Spring Harbor Protocols, Nature Protocols, and Methods in Enzymology. Commercial suppliers such as Bio-Rad Laboratories, Thermo Fisher Scientific, GE Healthcare, Sigma-Aldrich, and Merck Group provide reagents and pre-cast gels commonly used in settings from Scripps Research to Max Delbrück Center.

The mechanism relies on protein denaturation and charge uniformity imparted by sodium dodecyl sulfate; proteins migrate through polyacrylamide whose pore size is controlled by acrylamide and bis-acrylamide crosslinkers, building on polymer chemistry developments from groups at DuPont, BASF, Dow Chemical Company, University of Illinois Urbana-Champaign, and Massachusetts Institute of Technology. Electrophoretic separation uses electric potential established using power supplies from manufacturers like Amersham, Bio-Rad Laboratories, and VWR International and draws on theoretical frameworks influenced by research at California Institute of Technology, Institute of Cancer Research, and Yale University. Visualization of bands often employs staining protocols originating from work associated with Cold Spring Harbor Laboratory, EMBO, British Medical Journal, Journal of Biological Chemistry, and Proceedings of the National Academy of Sciences.

Numerous variants adapt the basic method: gradient gels introduced by groups at University of Basel and ETH Zurich; two-dimensional electrophoresis combining isoelectric focusing from research at University of Geneva and University of California, San Diego; blue-native PAGE developed in collaborations involving European Molecular Biology Laboratory and Max Planck Society; and capillary electrophoresis alternatives championed at National Institute of Standards and Technology and Siemens Healthineers. Modifications for visualization and detection include silver staining protocols refined at University of Heidelberg and Karolinska Institutet, fluorescent labeling advanced at Howard Hughes Medical Institute and Genentech, and western blot transfer techniques pioneered at Rockefeller University and Scripps Research.

SDS-PAGE is applied across fields in laboratories at National Cancer Institute, Centers for Disease Control and Prevention, Food and Drug Administration, European Centre for Disease Prevention and Control, and United Nations research programs for protein purification assessment, molecular weight estimation, sample quality control, and post-translational modification analysis. It supports proteomics pipelines at facilities like European Bioinformatics Institute, ProteomeXchange, Wellcome Sanger Institute, Broad Institute, and European Molecular Biology Laboratory-affiliated centers. Clinical and industrial uses occur in diagnostics and quality control at Roche Diagnostics, Pfizer, Johnson & Johnson, Novartis, and GlaxoSmithKline.

Limitations recognized by researchers at National Institutes of Health, European Molecular Biology Laboratory, Wellcome Trust Sanger Institute, Cold Spring Harbor Laboratory, and Max Planck Institute for Biophysical Chemistry include incomplete denaturation of membrane proteins studied at University of California, San Diego and Johns Hopkins University, anomalous migration of glycoproteins investigated at Stanford University and MIT, and limited resolution for very large complexes analyzed at EMBL-EBI and European Proteomics Association. Troubleshooting strategies are discussed in manuals from Cold Spring Harbor Protocols, Nature Protocols, Methods in Enzymology, and training programs at Harvard Medical School and Imperial College London, covering issues such as polymerization inhibition traced to contaminants from suppliers like Merck Group and Sigma-Aldrich, buffer pH problems reported in studies at University of Cambridge and University of Oxford, and detection sensitivity improvements developed at Howard Hughes Medical Institute and European Molecular Biology Laboratory.