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Crystallizing Membrane Proteins for Structure Determination using Lipidic Mesophases
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Structural insight into co-translational membrane protein folding.

Grant A Pellowe1, Paula J Booth1

  • 1Department of Chemistry, King's College London, 7 Trinity Street, SE1 1DB, London, UK.

Biochimica Et Biophysica Acta. Biomembranes
|July 15, 2019
PubMed
Summary

Investigating membrane protein folding is challenging but crucial for understanding diseases. Recent techniques offer new insights into how these proteins fold and insert into cell membranes during translation.

Keywords:
Alpha-helicalCo-translationalFolding and insertionMembrane proteinsRibosome nascent chainsSEIRAS

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Area of Science:

  • Molecular Biophysics
  • Membrane Biology
  • Protein Folding

Background:

  • Membrane protein folding studies are less advanced than soluble proteins due to experimental challenges in recreating lipid-bilayer environments.
  • Misfolded membrane proteins are linked to various diseases, highlighting the importance of understanding their folding mechanisms.
  • Membrane proteins, comprising a third of the proteome, often feature alpha-helical transmembrane domains crucial for cellular function.

Purpose of the Study:

  • To review recent advancements in techniques for studying membrane protein folding.
  • To highlight new methods for understanding co-translational folding and nascent chain insertion.
  • To explore the structure and insertion dynamics of membrane proteins as they emerge from ribosomes.

Main Methods:

  • Review of recent literature on membrane protein biophysics.
  • Focus on techniques applicable to in vitro studies of membrane protein folding.
  • Analysis of methods examining nascent chain behavior during translation.

Main Results:

  • Recent techniques provide enhanced capabilities for observing co-translational folding of membrane proteins.
  • Advances allow for better characterization of nascent chain structure and insertion into lipid bilayers.
  • New methods facilitate the study of the SecYEG/Sec61 translocase system's role in protein insertion.

Conclusions:

  • Improved techniques are essential for overcoming experimental hurdles in membrane protein folding research.
  • Understanding co-translational folding is key to deciphering membrane protein structure-function relationships.
  • Further research using these advanced methods will illuminate disease mechanisms linked to protein misfolding.