Protein Gel Shift
Protein Gel Shift - Related Videos
10:55
Staining Proteins in Gels
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Cited by 7 •
2008
Following separation by electrophoretic methods, proteins in a gel can be detected by several staining methods. Staining of proteins with Coomassie Blue, Silver Staining, SYPRO Orange, SYPRO Ruby are demonstrated in this video.
07:47
Staining of Proteins in Gels with Coomassie G-250 without Organic Solvent and Acetic Acid
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Cited by 94 •
2009
A short protocol for protein staining with Coomassie Brilliant Blue (CBB) G-250 in polyacrylamide gels is described without using organic solvents or acetic acid as in the classical staining procedures with CBB.
08:28
Acyl-PEGyl Exchange Gel Shift Assay for Quantitative Determination of Palmitoylation of Brain Membrane Proteins
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Cited by 7 •
2020
Palmitoylation entails the incorporation of a 16-carbon palmitate moiety to cysteine residues of target proteins in a reversible manner. Here, we describe a biochemical approach, the acyl-PEGyl exchange gel shift (APEGS) assay, to investigate the palmitoylation state of any protein of interest in mouse brain lysates.
06:36
Horizontal Gel Electrophoresis for Enhanced Detection of Protein-RNA Complexes
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Cited by 6 •
2017
Native polyacrylamide gel electrophoresis is a fundamental tool for analyzing RNA-protein interactions. Traditionally most experiments have used vertical gels. However, horizontal gels provide several advantages, such as the opportunity to monitor complexes during electrophoresis. We provide a detailed protocol for generating and using horizontal native gel electrophoresis.
11:03
Pouring and Running a Protein Gel by reusing Commercial Cassettes
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Cited by 2 •
2012
Our protocol demonstrates how to pour multiple protein gels at a time by recycling Invitrogen Nupage Novex minigel cassettes, and inexpensive materials purchased at a home improvement store. This economical and streamlined method includes a way to store the gels at 4°C for a few weeks. By re-using the plastic gel cassettes from commercially available gels, labs that run frequent protein gels can save significant costs and help the environment.
FAQs
The observed mobility depends on how binding or modification changes a protein’s size, electrical charge, or three-dimensional shape. A complex may therefore migrate differently even when the component protein itself has not been chemically altered. Examining these properties helps researchers interpret whether a changed band position is consistent with complex formation or another molecular change.
Non-denaturing conditions help preserve the protein interactions or conformations being examined during electrophoresis. If the relevant molecular association remains intact, the bound form can be compared with the unbound form through its altered migration. This makes the resulting shift useful as an observable indicator of molecular binding rather than merely a consequence of disrupted structure.
A shifted position shows that the protein’s electrophoretic behavior differs from that of the comparison form. When the difference follows binding, it supports formation of a complex; when it follows another molecular change, it can indicate altered conformation or modification. Interpretation depends on relating the migration pattern to the specific form analyzed.
Binding specificity can be examined by determining whether a reproducible mobility change occurs for the interaction under study. A shift associated with a particular protein, DNA, or RNA partner provides evidence that the components interact in the analyzed system. This approach connects the identity of the tested partner with a measurable change in electrophoretic behavior.
The central comparison places a protein form that has not undergone the interaction or modification alongside its bound or modified counterpart during gel electrophoresis. Both are evaluated by how they move through the polyacrylamide matrix. A difference in migration provides the primary experimental readout for analyzing the molecular change.
Protein gel shift analysis can be applied to protein–protein, protein–DNA, and protein–RNA interactions. These uses allow investigators to examine whether a protein associates with another protein or with a nucleic-acid partner. The method can also support estimates of complex formation, making it relevant to interaction studies across biochemistry.
The migration pattern converts a molecular interaction into a visible electrophoretic outcome. Researchers can use the difference between bands to estimate whether a complex formed and to compare the behavior of bound, unbound, or modified protein forms. This offers a relatively direct connection between biochemical binding events and experimentally measurable movement through a gel.