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Related Experiment Videos

Evidence that bilayer bending rigidity affects membrane protein folding

P J Booth1, M L Riley, S L Flitsch

  • 1Department of Biochemistry, Imperial College of Science, Technology, and Medicine, London, U.K.

Biochemistry
|January 7, 1997
PubMed
Summary

This study shows that dihexanoylphosphatidylcholine (DHPC) can replace CHAPS in lipid-based systems for bacteriorhodopsin regeneration. Refolding kinetics are similar, controlled by bilayer rigidity and pH.

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Area of Science:

  • Biochemistry
  • Membrane Protein Folding
  • Biophysics

Background:

  • Bacteriorhodopsin regeneration previously used detergent-based systems like dimyristoylphosphatidylcholine (DMPC)/CHAPS micelles.
  • Integral membrane protein refolding is crucial for understanding protein function and stability.

Purpose of the Study:

  • To investigate bacteriorhodopsin regeneration kinetics in a lipid-based system using dihexanoylphosphatidylcholine (DHPC) instead of CHAPS.
  • To determine if DHPC can be substituted for CHAPS in mixed DMPC/DHPC micelles for high-yield bacteriorhodopsin regeneration.

Main Methods:

  • Utilized rapid, stopped-flow mixing to initiate refolding of denatured bacterioopsin.
  • Employed time-resolved fluorescence spectroscopy to monitor protein folding kinetics.
  • Investigated refolding in mixed DMPC/DHPC micelles and compared with DMPC/CHAPS micelles.

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Main Results:

  • Achieved high-yield bacteriorhodopsin regeneration in mixed DMPC/DHPC micelles, comparable to DMPC/CHAPS systems.
  • Identified a single second-order retinal/apoprotein reaction as rate-limiting, with identical free energy in both micelle types.
  • Demonstrated that the rate of formation of a partially folded apoprotein intermediate is dependent on DMPC concentration (bilayer bending rigidity) and pH.

Conclusions:

  • Dihexanoylphosphatidylcholine (DHPC) is a viable alternative to CHAPS for bacteriorhodopsin regeneration in lipid-based systems.
  • Bacteriorhodopsin folding rates can be modulated by controlling lipid bilayer properties (bending rigidity) and pH.
  • The rate-limiting step in bacteriorhodopsin folding is influenced by both lipid environment and direct protein effects related to pH.