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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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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...
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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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Reconstitution of Septin Assembly at Membranes to Study Biophysical Properties and Functions
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Protein-induced membrane strain drives supercomplex formation.

Maximilian C Pöverlein1, Alexander Jussupow1, Hyunho Kim1

  • 1Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden.

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|February 23, 2026
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Summary
This summary is machine-generated.

Supercomplexes of electron transport chain proteins in mitochondria reduce membrane strain, improving ATP production. This assembly optimizes respiratory function in crowded cellular environments.

Keywords:
bioenergeticsmolecular biophysicsmolecular dynamicsprotein–membrane interactionsrespiratory complexesstructural biologysupercomplexes

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Area of Science:

  • Mitochondrial biology
  • Biophysics
  • Molecular dynamics

Background:

  • Mitochondrial membranes contain the electron transport chain (ETC) essential for ATP synthesis via oxidative phosphorylation (OXPHOS).
  • Proteins of the ETC assemble into supercomplexes (SC), but their functional significance is debated.

Purpose of the Study:

  • To investigate the functional role of mammalian ETC supercomplexes, specifically the I/III2 SC.
  • To understand how SC formation impacts mitochondrial membrane properties and protein dynamics.

Main Methods:

  • Large-scale atomistic and coarse-grained molecular simulations.
  • Analysis of cryo-electron microscopy data.
  • Statistical and kinetic modeling.

Main Results:

  • Mammalian I/III2 SC formation alleviates inner mitochondrial membrane strain by modifying local membrane thickness.
  • SC assembly promotes the accumulation of cardiolipin and quinones around the supercomplex.
  • Supercomplex formation influences the global motion of individual ETC proteins.

Conclusions:

  • Molecular crowding and membrane strain act as thermodynamic drivers for SC formation.
  • SC assembly may enhance respiratory flux in crowded membranes under constrained conditions.