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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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Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy
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Roll out the barrel! Outer membrane tension resolves an unexpected folding intermediate.

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Bacteria use membrane elastic tension to assemble outer membrane proteins. The beta-barrel assembly machinery (BAM) harnesses this force to fold beta-barrel proteins without needing energy.

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Area of Science:

  • Microbiology
  • Structural Biology
  • Biophysics

Background:

  • Bacteria require outer membrane proteins for survival.
  • Transmembrane beta-barrels are essential outer membrane proteins.
  • Assembly of beta-barrels into the outer membrane is complex and not fully understood.

Purpose of the Study:

  • To investigate the mechanism by which bacteria assemble transmembrane beta-barrels.
  • To understand how this assembly occurs in the absence of an external energy source.

Main Methods:

  • Determining novel structures of the beta-barrel assembly machinery (BAM) complex.
  • Conducting experimental assays to test the role of membrane tension.

Main Results:

  • The BAM complex utilizes the inherent elastic energy of the cell membrane.
  • Membrane tension actively contributes to the completion of beta-barrel protein folding.
  • This mechanism allows for efficient protein assembly without direct energy input.

Conclusions:

  • Bacterial outer membrane protein assembly is powered by membrane elastic tension.
  • The BAM complex is a sophisticated machine that exploits physical forces for protein folding.
  • This finding provides new insights into the energetics of membrane protein biogenesis.