Supercomplex Assembly
Supercomplex Assembly - Related Videos
08:37
Analyzing Supercomplexes of the Mitochondrial Electron Transport Chain with Native Electrophoresis, In-gel Assays, and Electroelution
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Cited by 15 •
2017
This protocol describes the separation of functional mitochondrial electron transport chain complexes (Cx) I-V and supercomplexes thereof using native electrophoresis to reveal information about their assembly and structure. The native gel can be subjected to immunoblotting, in-gel assays, and purification by electroelution to further characterize individual complexes.
01:41
The Supercomplexes in the Crista Membrane
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2023
The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
11:36
Assembly, Loading, and Alignment of an Analytical Ultracentrifuge Sample Cell
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Cited by 21 •
2009
The analytical ultracentrifuge (AUC) sample cell holds sample and reference buffer and during experiments and is exposed to high vacuum and rotor speeds up to 60,000 rpm. This video will demonstrate the rigorous attention to detail necessary for assembly, loading and alignment of this very important component of an AUC experiment.
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...
13:05
Micropatterning and Assembly of 3D Microvessels
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Cited by 12 •
2016
This manuscript presents an injection molding method to engineer microvessels that recapitulate physiological properties of endothelium. The microfluidic-based process creates patent 3D vascular networks with tailorable conditions, such as flow, cellular composition, geometry, and biochemical gradients. The fabrication process and examples of potential applications are described.
FAQs
Assembly proceeds through an ordered sequence rather than a single joining event. Separately synthesized subunits can first form preassembled molecular complexes, which then participate in later association steps. Detecting these intermediates helps researchers distinguish incomplete assembly from mature supercomplex formation and relate structural progression to the emergence of coordinated respiratory-chain activity.
Protein-protein interactions provide the molecular contacts that bring respiratory-chain complexes together and help define their higher-order arrangement. Their specificity influences which complexes associate and how stable the resulting structure becomes. Because these contacts organize electron-transfer components, changes in interaction patterns can affect pathway coordination and the performance of oxidative phosphorylation.
Membrane composition helps stabilize assembly intermediates and supports the incorporation of components into mature structures. This means that protein subunits are not organized independently of their lipid environment. Examining both protein interactions and membrane context gives a more complete explanation of why some assembly steps proceed efficiently while others may remain incomplete or unstable.
Assembly factors help stabilize intermediate states and guide the incorporation of components as respiratory structures develop. They therefore support progression through the ordered assembly pathway rather than simply becoming part of the final arrangement. Their role is important for connecting molecular organization with the formation of functional structures capable of coordinated biochemical activity.
Higher-order organization can place respiratory-chain components into arrangements that organize electron-transfer pathways, influence enzyme stability, and affect oxidative phosphorylation efficiency. The important outcome is functional coordination across associated complexes, not merely their physical proximity. Studying these effects helps connect changes in molecular structure with altered cellular energy production.
This research can link defects in respiratory-structure organization with disrupted cellular energy production. It is relevant to mitochondrial disease and inherited respiratory defects because abnormal assembly may affect complex stability, electron-transfer organization, or oxidative phosphorylation efficiency. The same framework also supports investigation of dynamic membrane protein organization and its relationship to metabolism.