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Side-chain contributions to membrane protein structure and stability.

Salem Faham1, Duan Yang, Emiko Bare

  • 1Department of Chemistry and Biochemistry, UCLA-DOE Center for Genomics and Proteomics, Molecular Biology Institute, University of California, Los Angeles, CA 90095-1570, USA.

Journal of Molecular Biology
|December 9, 2003
PubMed
Summary

Membrane protein stability is surprisingly not highly optimized. Van der Waals forces, similar to soluble proteins, appear to be the primary drivers of membrane protein folding and stability.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Membrane Biophysics

Background:

  • The molecular forces governing membrane protein structure and stability remain largely unelucidated.
  • Understanding these forces is crucial for fields ranging from drug discovery to synthetic biology.

Purpose of the Study:

  • To investigate the molecular forces stabilizing membrane protein structure.
  • To assess the stability and structural integrity of bacteriorhodopsin through targeted mutations.

Main Methods:

  • Introduced 24 alanine substitutions in the B helix of bacteriorhodopsin.
  • Analyzed the effects of these mutations on protein structure and stability.
  • Utilized X-ray crystallography to determine the structural impact of key mutations.

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Main Results:

  • Identified a high frequency (17%) of stabilizing mutations, suggesting membrane proteins are not maximally optimized for stability.
  • Observed that helix B in bacteriorhodopsin is kinked, with tertiary contacts playing a dominant role in maintaining this distortion.
  • Quantified protein stabilization at approximately 1 kcal/mol per 38 Ų of buried surface area, comparable to soluble proteins.
  • Found minimal energetic differences between burying apolar and polar surface areas, highlighting the significance of van der Waals packing.

Conclusions:

  • Membrane protein stability is influenced by factors similar to those in soluble proteins, with van der Waals interactions being a dominant force.
  • The findings challenge the notion of highly optimized stability in membrane proteins and provide quantitative insights into their folding energetics.