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Related Experiment Videos

Conformational change in bacterio-opsin on binding to retinal.

R Renthal1, C Alaniz

  • 1Division of Earth and Physical Sciences, University of Texas at San Antonio 78249, USA. rrenthal@utsa.edu

Biophysical Chemistry
|May 27, 1999
PubMed
Summary

This study investigated bacteriorhodopsin formation, revealing a significant protein conformational change during chromophore formation. This process is crucial for understanding membrane protein folding and retinal pigment development.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Membrane Protein Dynamics

Background:

  • Understanding retinal binding to bacterio-opsin is key for retinal pigment formation.
  • The process of membrane protein folding requires detailed mechanistic insights.

Purpose of the Study:

  • To measure the temperature dependence of bacteriorhodopsin formation from bacterio-opsin and all-trans retinal.
  • To elucidate the conformational changes involved in chromophore formation.

Main Methods:

  • Kinetic measurements of bacteriorhodopsin formation.
  • Arrhenius plot analysis of rate constants.
  • Comparative analysis with model compound reactions.

Main Results:

  • Determined an activation energy of 11.6 +/- 0.7 kcal/mol for bacteriorhodopsin formation.

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  • Calculated an activation entropy of -4 +/- 2 cal/mol deg.
  • Identified a substantial protein conformational change during chromophore formation.

    • Conclusions:

    • Bacteriorhodopsin chromophore formation involves significant protein conformational changes.
    • The loop between helices B and C is not implicated in this conformational change, even after cleavage.