Protein Detergent Complexes
Protein Detergent Complexes - Related Videos
01:18
Detergent Purification of Membrane Proteins
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2023
Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
10:43
Expression, Detergent Solubilization, and Purification of a Membrane Transporter, the MexB Multidrug Resistance Protein
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Cited by 5 •
2010
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.
02:41
Protein Complex Assembly
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2020
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes. Many viruses self-assemble into a fully functional unit using the infected host cell to...
01:57
Protein Complexes with Interchangeable Parts
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2020
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct. The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
09:35
Enrichment of Detergent-insoluble Protein Aggregates from Human Postmortem Brain
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Cited by 45 •
2017
An abbreviated fractionation protocol for the enrichment of detergent-insoluble protein aggregates from human postmortem brain is described.
FAQs
The critical micelle concentration sets the threshold for effective complex formation. Above this concentration, detergent molecules associate into micelle-like structures that can organize around exposed nonpolar protein surfaces. Maintaining an appropriate concentration therefore helps keep membrane proteins dispersed in aqueous laboratory solutions and supports subsequent biochemical handling, rather than allowing hydrophobic regions to compromise solubility.
Detergent molecules replace the surrounding lipid bilayer with a micelle-like environment around hydrophobic protein regions. This substitution can preserve solubility, but it may also influence the protein’s stability and conformation. Consequently, a detergent that supports extraction may not preserve the same structural state or behavior required for later activity measurements or structural analysis.
Detergent selection and concentration are the main variables governing the behavior of these complexes. Their effects can extend beyond solubilization to protein stability, conformation, activity, and compatibility with downstream assays. Researchers therefore need to match the detergent conditions to the intended experiment, because a condition suitable for one stage of analysis may interfere with another.
An unsuitable detergent condition can alter protein stability, conformation, or activity, even if it successfully keeps the protein soluble. It may also reduce compatibility with a downstream assay, limiting the value of the preparation. The practical consequence is that complex formation must be evaluated not only by solubility, but also by how well the resulting protein behaves in the planned analysis.
In biological techniques, the complexes support a sequence of activities that includes membrane protein extraction, purification, electrophoresis, and structural analysis. Detergent conditions are established during preparation and then carried through, or otherwise considered, during later stages. Their influence on solubility and protein behavior determines whether the preparation remains useful as it moves from isolation toward characterization.
Detergent conditions can affect more than the initial extraction step. Because they may influence protein conformation, stability, activity, and assay compatibility, they can also shape the quality of information obtained during electrophoresis or structural analysis. Considering these effects in advance helps researchers interpret whether an observed result reflects the protein itself or the detergent-supported experimental environment.
Their principal applications are the handling and characterization of membrane proteins in aqueous laboratory systems. They can support extraction from membrane-associated material, purification of the solubilized protein, electrophoretic examination, and structural studies. This broad utility makes detergent complexes relevant whenever researchers need to move a hydrophobic protein from a lipid-associated setting into biochemical workflows.