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Related Experiment Videos

Light- and dark-adapted bacteriorhodopsin, a time-resolved neutron diffraction study.

N A Dencher1, G Papadopoulos, D Dresselhaus

  • 1Department of Physics/Biophysics, Freie Universität Berlin, Germany.

Biochimica Et Biophysica Acta
|July 9, 1990
PubMed
Summary
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Neutron diffraction reveals no protein conformation changes during light-dark adaptation in bacteriorhodopsin (BR) ground states. This contrasts with light-induced M-intermediate transitions, highlighting distinct molecular mechanisms in BR proton pumping.

Area of Science:

  • Structural Biology
  • Biophysics
  • Membrane Protein Dynamics

Background:

  • Bacteriorhodopsin (BR) is a light-driven proton pump crucial for energy transduction.
  • BR undergoes conformational changes during its photocycle, particularly between the ground state and the M-intermediate.
  • Dark-adapted BR exists as a mixture of all-trans and 13-cis retinal isomers.

Purpose of the Study:

  • To investigate protein conformational changes during light-dark adaptation in bacteriorhodopsin.
  • To compare structural dynamics between ground-state isomer interconversion and M-intermediate formation.
  • To determine the role of water molecule redistribution in purple membrane light-dark adaptation.

Main Methods:

  • Time-resolved neutron diffraction experiments were employed.

Related Experiment Videos

  • High-resolution structural analysis (up to 7 Å) was performed.
  • Comparison of structural states of all-trans-BR and 13-cis-BR.

    • Main Results:

    • No significant protein conformational changes were observed during the transition between 13-cis-BR and all-trans-BR ground states.
    • The isomerization of retinal in ground-state transitions minimizes chromophore displacement compared to M-intermediate formation.
    • No large-scale water molecule redistribution was detected in the purple membrane during light-dark adaptation.

    Conclusions:

    • Ground-state isomer interconversion in BR involves distinct structural mechanisms compared to the light-induced M-intermediate formation.
    • The Schiff's base environment remains largely conserved during all-trans to 13-cis retinal isomerization.
    • Light-dark adaptation in purple membranes does not involve significant water redistribution.