Beta-dm Solubilization

Beta-DM solubilization is a biochemical method that uses beta-dodecyl maltoside, a mild nonionic detergent, to extract membrane proteins from lipid bilayers while helping maintain their native structure. Beta-DM molecules insert their hydrophobic tails into the membrane and surround released proteins with detergent micelles, replacing protein-lipid interactions with a water-compatible detergent environment. This approach supports membrane-protein purification, biochemical characterization, and structural studies, including analysis of protein complexes and interactions with ligands or cofactors. Because detergent concentration and solution conditions influence solubilization efficiency and protein stability, optimizing these parameters is essential for obtaining functional, homogeneous samples.

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2026

Source: Stauffer, S. et al., In Vitro Disassembly of Influenza A Virus Capsids by Gradient Centrifugation. J. Vis. Exp. (2016)This video demonstrates the effect of pH on the solubilization of influenza A viral cores. Gel electrophoresis and protein staining reveal the progressive disassembly of the core structure under acidic conditions.

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Expression, Detergent Solubilization, and Purification of a Membrane Transporter, the MexB Multidrug Resistance Protein

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Cited by 5 •

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In this protocol we demonstrate the expression, solubilization, and purification of a recombinantly expressed membrane protein, MexB, as a soluble protein detergent complex. MexB is a multidrug resistance membrane transporter from the opportunistic bacterial pathogen Pseudomonas aeruginosa.

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In this video, we demonstrate a fluorescence-detection size-exclusion chromatography technique to screen for green fluorescent protein (GFP)-fused membrane protein stability in Escherichia coli following detergent solubilization. Proteins exhibiting a symmetrical peak in the size-exclusion profile with little or no free GFP indicate purified proteins with minimum degradation and aggregation, which can subsequently be selected for structure-function analysis.

Research

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Expression, Solubilization, and Purification of Eukaryotic Borate Transporters

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Cited by 5 •

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Here we present a protocol to express, solubilize, and purify several eukaryotic borate transporters with homology to the SLC4 transporter family using yeast. We also describe a chemical cross-linking assay to assess the purified homomeric proteins for multimeric assembly. These protocols can be adapted for other challenging membrane proteins.

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