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A Model for Shaping Membrane Sheets by Protein Scaffolds.

Yonatan Schweitzer1, Tom Shemesh2, Michael M Kozlov3

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Computational analysis reveals how protein scaffolds shape endoplasmic reticulum (ER) membranes. Specific scaffold geometry dictates membrane curvature and elasticity, explaining ER sheet formation.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Computational Biology

Background:

  • Endoplasmic reticulum (ER) membranes exhibit complex structures like tubules and sheets.
  • ER shaping is hypothesized to involve protein scaffolds at sheet edges.
  • The precise relationship between scaffold structure and membrane mechanics was unclear.

Purpose of the Study:

  • To computationally investigate the physical mechanism of ER membrane shaping.
  • To analyze how protein scaffold geometry influences membrane morphology and elasticity.
  • To elucidate the relationship between scaffold structure and ER sheet formation.

Main Methods:

  • Minimization of membrane bending elastic energy.
  • Modeling rowlike arrays of semicircular arclike membrane scaffolds.
  • Quantitative analysis of scaffold geometry's effect on membrane curvature and scaffold spacing.

Main Results:

  • Protein scaffolds induce membrane folds, shaping the membrane into flat double-membrane sheets.
  • Scaffold geometry quantitatively determines positive or negative membrane edge curvature.
  • Effective elastic properties of the membrane edge were computed.
  • Equilibrium scaffold spacing depends on scaffold geometry.

Conclusions:

  • The study provides a quantitative biophysical model for ER membrane shaping.
  • Scaffold geometry is a critical determinant of ER membrane morphology and mechanics.
  • This work clarifies the hypothetical link between protein scaffold structure and ER sheet formation.