Multiprotein Complex Analysis
Multiprotein Complex Analysis - Related Videos
12:03
Blue Native Polyacrylamide Gel Electrophoresis (BN-PAGE) for Analysis of Multiprotein Complexes from Cellular Lysates
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Cited by 92 •
2011
In this video, we describe the characterization of multiprotein complexes (MPCs) by blue native polyacrylamide gel electrophoresis (BN-PAGE). In a first dimension, dialyzed cellular lysates are separated by BN-PAGE to identify individual MPCs. In a second dimension SDS-PAGE, MPCs of interest are further subdivided to analyze their constituents by immunoblotting.
08:04
A New Approach for the Comparative Analysis of Multiprotein Complexes Based on 15N Metabolic Labeling and Quantitative Mass Spectrometry
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Cited by 4 •
2014
The described comparative, quantitative proteomic approach aims at obtaining insights into the composition of multiprotein complexes under different conditions and is demonstrated by comparing genetically different strains. For quantitative analysis equal volumes of different fractions from a sucrose density gradient are mixed and analyzed by mass spectrometry.
07:49
On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes
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Cited by 14 •
2016
A method combining comprehensive two-dimensional gas chromatography with nitrogen chemiluminescence detection has been developed and applied to on-line analysis of nitrogen containing compounds in a complex hydrocarbon matrix.
01:21
Mass Spectrometry: Complex Analysis
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2024
Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures. GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
10:05
In Vitro Analysis of PDZ-dependent CFTR Macromolecular Signaling Complexes
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Cited by 7 •
2012
Cystic fibrosis transmembrane conductance regulator (CFTR), an epithelial chloride channel, has been reported to interact with various proteins and regulate important cellular processes; among them the CFTR PDZ motif-mediated interactions have been well documented. This protocol describes methods we developed to assemble a PDZ-dependent CFTR macromolecular signaling complex in vitro.
FAQs
The identity, relative arrangement, and stoichiometry of subunits help determine how a molecular assembly performs its biological role. Analysis therefore goes beyond listing associated proteins: it examines which components are present, how many copies occur, and how binding partners are arranged. These features can connect molecular architecture with activities such as signaling, gene regulation, degradation, or transport.
Preserving interactions helps maintain the assembly in a state that more closely reflects its functional organization during isolation or detection. If associations are disrupted, important subunits or binding partners may be missed, leading to an incomplete view of composition and assembly. Conditions that retain these interactions are therefore central to interpreting complex structure and biological activity.
Stoichiometry indicates the number or relative representation of subunits within an assembly, while binding-partner analysis identifies proteins associated with particular components. Together, these measurements help distinguish the complex’s composition from its organization and clarify how its parts may support function. This information is especially useful when linking molecular structure to regulated cellular processes.
A typical workflow begins by isolating or detecting complexes under conditions intended to preserve protein–protein interactions. Researchers then characterize the recovered assemblies using approaches such as affinity purification, native electrophoresis, immunoprecipitation, or mass spectrometry. The resulting information can address subunit identity, stoichiometry, binding partners, and assembly, allowing molecular findings to be related to biological activity.
These approaches provide alternative ways to isolate or detect assemblies and characterize their components. Affinity purification and immunoprecipitation can support recovery or detection of associated proteins, native electrophoresis examines complexes under non-denaturing conditions, and mass spectrometry helps characterize composition. Used within an interaction-preserving workflow, they support analysis of subunits, partners, and assembly.
The approach helps connect molecular assemblies with signal transduction, gene regulation, protein degradation, and cellular transport. It can also identify disease-related changes in protein interactions, providing insight into how altered assemblies may relate to biological dysfunction. Those findings can clarify complex function and guide targeted experimental strategies or therapeutic development.