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Helix formation and stability in membranes.

Matthew J McKay1, Fahmida Afrose1, Roger E Koeppe1

  • 1Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR 72701, USA.

Biochimica Et Biophysica Acta. Biomembranes
|February 16, 2018
PubMed
Summary

Understanding alpha-helical membrane protein folding is crucial for biology and medicine. While some proteins need assistance, spontaneous folding principles, influenced by sequence and lipids, are still being uncovered.

Keywords:
Cell-penetrating peptideCrossing a lipid bilayerMembrane protein foldingSolid-state nuclear magnetic resonanceTransmembrane helix

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • Membrane proteins are essential for cellular functions and implicated in diseases.
  • Their active conformations form within the cell bilayer membrane.
  • The spontaneous folding process at the molecular level remains poorly understood.

Purpose of the Study:

  • To review current understanding of alpha-helical membrane protein folding principles.
  • To highlight factors influencing folding, including spontaneous mechanisms.
  • To discuss implications for protein structure, dynamics, and function.

Main Methods:

  • Review of existing literature on membrane protein folding.
  • Analysis of factors affecting protein structure in lipid bilayers.
  • Discussion of experimental and theoretical findings.

Main Results:

  • Alpha-helical membrane protein folding is sequence-based, with lipids contributing to stability.
  • Helix fraying and loop formation are suggested to be important for structure and dynamics.
  • pH-dependent topological changes and passive peptide translocation across membranes were noted.

Conclusions:

  • Significant progress has been made in understanding alpha-helical membrane protein folding.
  • The process is complex, involving sequence-specific interactions and lipid modulation.
  • Further research is needed to fully elucidate the molecular mechanisms of membrane protein folding.