Multimeric Protein Analysis
Multimeric Protein Analysis - Related Videos
02:44
Non-Reducing SDS PAGE: A Method to Analyze Disulfide-Linked Multimeric Protein Complexes
0 Views •
2025
This video describes the technique of separating the protein samples by non-reducing SDS-PAGE to analyze the multimeric protein complexes. This technique retains the multimer subunits of a protein held by the disulfide bonds which can later be analyzed by western blotting.
06:59
Multimer-PAGE for Separating Native Protein Complexes: A Hybrid Separation Technique Consisting of Blue Native-PAGE and SDS-PAGE to Separate Intact Multimeric Proteins From Tissue Lysate
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2025
This video describes multimeric PAGE for separating native protein complexes from tissue homogenates. The technique is a hybrid of blue native-PAGE and SDS-PAGE techniques. The separated complexes can be characterized and studied for their role in cell functioning.
08:46
Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli
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Cited by 34 •
2015
A streamlined approach to screening for the expression of recombinant membrane proteins in Escherichia coli based on fusion to green fluorescent protein is presented.
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...
02:21
Globular and Fibrous Proteins
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2020
Many proteins can be classified into two distinct subtypes - globular or fibrous. These two types differ in their shapes and solubilities. Globular proteins are also known as spheroproteins and typically are approximately round in shape. They contain a mix of amino acid types and contain differing sequences in their primary structures. Globular proteins have many different functions, such as enzymes, cellular messengers, and molecular transporters. These roles often require the proteins to be...
FAQs
Researchers compare the behavior of intact protein assemblies under conditions that preserve subunit interactions with behavior observed when those interactions are less well maintained. Consistent detection of the same assembly supports stability, whereas changes in the observed oligomeric state indicate condition dependence. This distinction helps relate complex formation to protein structure, function, and experimental handling.
A protein’s assembly state can influence both its structural organization and its functional behavior. Distinguishing monomers, dimers, and higher-order complexes therefore provides more than a measurement of molecular size: it helps researchers assess how subunit association may affect signaling, cellular pathways, or therapeutic activity. The result supports structure-function studies that connect assembly with biological performance.
The analysis examines intact complexes with methods such as native electrophoresis, size-exclusion chromatography, analytical ultracentrifugation, and chemical cross-linking. Differences in how assemblies behave during these measurements can indicate whether a sample contains monomers, dimers, or larger complexes. Comparing the detected forms also helps reveal whether multiple oligomeric states coexist or arise under different conditions.
A typical workflow preserves the sample’s intact subunit interactions, applies an appropriate characterization method, and evaluates the resulting assembly pattern. Researchers then compare the observed forms to determine oligomeric state and assess stability under the tested conditions. Native electrophoresis, size-exclusion chromatography, analytical ultracentrifugation, or chemical cross-linking can be selected according to the characterization approach required.
Method selection depends on how the intact complex needs to be separated or characterized. Native electrophoresis and size-exclusion chromatography provide separation-based approaches, while analytical ultracentrifugation and chemical cross-linking offer alternative ways to examine assemblies. Using one or more approaches can strengthen interpretation by showing whether the same oligomeric state is observed across complementary measurements.
It is useful whenever subunit assembly may affect the identity, behavior, or performance of a protein preparation. In research, measurements support protein characterization and structure-function studies. In quality control, they help assess whether the expected assembly is present and stable. The same information can also inform evaluation of therapeutic activity when complex formation influences performance.
These measurements can reveal how complex formation relates to cellular pathways, signaling, and therapeutic activity. By determining whether a protein occurs as a monomer, dimer, or higher-order assembly, researchers can compare assembly state with biological behavior. Such comparisons provide subject-specific context for biological techniques by linking biochemical characterization to functional questions in cells and therapeutic research.