Two Dimensional Gel Electrophoresis is a method used to separate proteins in a sample. The word "two" is spelled as /tu/, with the "w" being silent. "Dimensional" is spelled /dɪˈmɛnʃ(ə)n(ə)l/, with the stress on the second syllable. "Gel" is pronounced as /dʒɛl/, with a soft "g". "Electrophoresis" is spelled /ɪˌlɛktroʊfəˈriːsɪs/, with the stress on the third syllable. This technique is commonly used in proteomics research to analyze protein expression and is a fundamental tool in the study of biological processes.
Two-dimensional gel electrophoresis (2D gel electrophoresis) is a powerful technique in the field of proteomics, used to separate and analyze complex mixtures of proteins. It allows the separation of proteins based on their isoelectric point (pI) and molecular weight, providing a highly detailed analysis of the proteome.
In two-dimensional gel electrophoresis, the first dimension involves the separation of proteins based on their isoelectric points. A protein sample is loaded onto a gel strip with a pH gradient, and an electric field is applied. As the proteins migrate through the strip, they focus at their respective pI points.
The second dimension utilizes SDS-PAGE (sodium dodecyl sulfate-polyacrylamide gel electrophoresis) to separate the proteins based on their molecular weight. The focused proteins from the first dimension are then transferred onto an SDS-PAGE gel and an electric field is applied again. This separation allows a visual representation of the protein components in a sample, forming a two-dimensional gel.
Following electrophoresis, the two-dimensional gel can be stained to visualize the separated proteins. Different protein spots on the gel represent distinct protein species. These protein spots can then be excised from the gel for further analysis like protein identification using mass spectrometry.
Two-dimensional gel electrophoresis is widely used in proteomic studies to compare protein expression patterns between different samples, such as healthy and diseased tissues or cells exposed to different treatments. It provides a comprehensive and high-resolution analysis of protein mixtures, contributing to the understanding of complex biological systems.