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High resolution two-dimensional electrophoresis of proteins.

Why this mattered

O’Farrell’s paper turned protein analysis from a mostly one-protein-at-a-time exercise into a system-wide measurement problem. By combining isoelectric focusing with SDS electrophoresis, it separated proteins along two largely independent physical properties, producing reproducible spot maps rather than single bands or low-resolution mixtures. The reported ability to resolve roughly 1,100 E. coli components, detect extremely rare radiolabeled proteins, and match spots across gels made it newly practical to ask how many proteins a cell produced, which proteins changed between conditions, and whether specific mutations or charge-altering modifications had shifted a protein’s position.

The paradigm shift was not merely higher resolution; it was the creation of a visual, comparative proteome assay before the term “proteomics” existed. Researchers could now survey complex biological samples globally, quantify changes in protein abundance, and detect post-translational or mutational charge variants in vivo. This made protein expression patterns experimentally tractable in bacteria, tissues, development, disease models, and cell physiology, providing a bridge between genetics, biochemistry, and molecular cell biology.

Later mass-spectrometry-based proteomics would surpass two-dimensional gels in identification throughput, dynamic range, automation, and coverage, but it built on the conceptual opening that O’Farrell’s method created: the protein complement of a biological system could be mapped, compared, and treated as a global object of study. The paper’s influence lies in making “many proteins at once” a rigorous experimental target, helping establish the mindset and practical agenda that subsequent protein databases, biomarker discovery, post-translational modification studies, and proteome-scale technologies would extend.

Abstract

A technique has been developed for the separation of proteins by two-dimensional polyacrylamide gel electrophoresis. Due to its resolution and sensitivity, this technique is a powerful tool for the analysis and detection of proteins from complex biological sources. Proteins are separated according to isoelectric point by isoelectric focusing in the first dimension, and according to molecular weight by sodium dodecyl sulfate electrophoresis in the second dimension. Since these two parameters are unrelated, it is possible to obtain an almost uniform distribution of protein spots across a two-diminsional gel. This technique has resolved 1100 different components from Escherichia coli and should be capable of resolving a maximum of 5000 proteins. A protein containing as little as one disintegration per min of either 14C or 35S can be detected by autoradiography. A protein which constitutes 10 minus 4 to 10 minus 5% of the total protein can be detected and quantified by autoradiography. The reproducibility of the separation is sufficient to permit each spot on one separation to be matched with a spot on a different separation. This technique provides a method for estimation (at the described sensitivities) of the number of proteins made by any biological system. This system can resolve proteins differing in a single charge and consequently can be used in the analysis of in vivo modifications resulting in a change in charge. Proteins whose charge is changed by missense mutations can be identified. A detailed description of the methods as well as the characteristics of this system are presented.

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