Protein Subunit Dissociation
Protein Subunit Dissociation - Related Videos
08:55
Characterization of Multi-subunit Protein Complexes of Human MxA Using Non-denaturing Polyacrylamide Gel-electrophoresis
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Cited by 3 •
2016
This article describes a simple and rapid protocol to evaluate the oligomeric state of the dynamin-like GTPase MxA protein from lysates of human cells using a combination of non-denaturing PAGE with western blot analysis.
09:36
Recombinant α- β- and γ-Synucleins Stimulate Protein Phosphatase 2A Catalytic Subunit Activity in Cell Free Assays
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Cited by 7 •
2017
This publication presents a protocol showing how to measure the activity of recombinant protein phosphatase 2A catalytic subunit (PP2Ac) in response to recombinant α-synuclein, β-synuclein, or γ-synuclein proteins using a simple colorimetric assay. We show findings regarding α-synuclein specificity toward PP2Ac in mouse brain.
06:09
In Vitro Reassociation Assay to Measure the Formation of 80S Ribosomal Particles Using Salt-washed Ribosomal Subunits
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2025
Here, we describe a detailed protocol for the in vitro reassociation of purified, salt-washed eukaryotic ribosomal subunits for the analysis of 80S particle formation. This method is illustrated by analyzing ribosomal subunits isolated from a wild-type strain of Saccharomyces cerevisiae and a mutant strain deficient in the ribosomal protein eL24.
22:10
Multi-target Parallel Processing Approach for Gene-to-structure Determination of the Influenza Polymerase PB2 Subunit
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Cited by 3 •
2013
Structure-based drug design plays an important role in drug development. Pursuing multiple targets in parallel greatly increases the chance of success for lead discovery. The following article highlights how the Seattle Structural Genomics Center for Infectious Disease utilizes a multi-target approach for gene-to-structure determination of the PB2 influenza A subunit.
08:11
Stripe Assay to Study the Attractive or Repulsive Activity of a Protein Substrate Using Dissociated Hippocampal Neurons
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Cited by 7 •
2016
Axon guidance molecules regulate neuronal migration and targeted growth-cone navigation. We present a powerful method, the stripe assay, to assess the ability of guidance molecules to attract or repulse neurons. In this protocol, we demonstrate the stripe assay by showing FLRT2's ability to repel cultured hippocampal neurons.
FAQs
Changes in pH and ionic strength alter the electrostatic environment around a complex and can affect hydrogen bonding between polypeptide chains. When these interactions become sufficiently weak, separation becomes more favorable. Varying these conditions helps researchers determine how strongly a protein complex depends on charge-related interactions and whether its assembly is sensitive to its surrounding chemical environment.
Temperature and chemical conditions can weaken the noncovalent contacts that maintain a multi-subunit structure, including hydrogen bonds, electrostatic forces, and hydrophobic interactions. Because these forces contribute differently to assembly, changing the conditions can reveal which interactions are important for structural stability. This information helps connect environmental sensitivity with the way a protein complex remains organized.
Reducing agents can disrupt disulfide bonds that help stabilize protein subunits or their associations. This mechanism differs from changes in pH, ionic strength, or temperature, which primarily affect noncovalent interactions. Comparing results with and without reducing conditions can therefore indicate whether disulfide bonds contribute to maintaining the observed complex and help separate covalent stabilization from other structural forces.
Comparing intact complexes with their separated polypeptide chains can reveal subunit composition and distinguish different oligomeric states. The comparison also links the presence of a complete assembly with its functional behavior, supporting analysis of how structure relates to activity. These observations are useful when investigating whether a protein operates as an assembled complex or depends on particular subunit arrangements.
Researchers examine conditions that can weaken interactions holding a complex together, including changes in pH, ionic strength, temperature, and chemical environment. Reducing conditions may also be included when disulfide bonds could contribute to stability. Comparing the resulting dissociated and intact forms under these conditions provides a practical way to identify which structural interactions are most important for maintaining assembly.
In biology, the analysis supports studies of molecular recognition, enzyme regulation, protein assembly, and structural stability. Dissociation patterns can show how subunits associate, how oligomeric state relates to activity, and which interactions preserve a functional complex. The approach therefore connects molecular-level changes in protein organization with broader questions about recognition, regulation, and biological function.