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Related Experiment Videos

Electric field effects in bacteriorhodopsin

R Shinar, S Druckmann, M Ottolenghi

    Biophysical Journal
    |July 1, 1977
    PubMed
    Summary

    Electric field pulses align bacteriorhodopsin chromophores in Halobacterium halobium purple membrane fragments. Two relaxation times reveal membrane fragment rotation and faster internal chromophore reorientation.

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    Area of Science:

    • Biophysics
    • Membrane Biology
    • Spectroscopy

    Background:

    • Purple membrane fragments from Halobacterium halobium contain bacteriorhodopsin.
    • Bacteriorhodopsin is a light-activated proton pump with a chromophore.
    • Understanding molecular dynamics within membranes is crucial for biological processes.

    Purpose of the Study:

    • To investigate the effects of electric field pulses on purple membrane fragments.
    • To elucidate the mechanism of field-induced alignment of the bacteriorhodopsin chromophore.
    • To determine the timescales of molecular reorientation within the membrane.

    Main Methods:

    • Preparation of aqueous suspensions of Halobacterium halobium purple membrane fragments.
    • Exposure to transient electric field pulses.
    • Measurement of transient linear dichroism phenomena.

    Main Results:

    • Electric field pulses induced transient linear dichroism in purple membrane suspensions.
    • Two distinct relaxation times were observed.
    • A slower relaxation time (tau s ≈ 100 ms) corresponds to membrane fragment rotation.
    • A faster relaxation time (tau f ≈ 260 μs) corresponds to chromophore reorientation within the membrane.

    Conclusions:

    • Electric fields can induce alignment of bacteriorhodopsin chromophores.
    • The study reveals distinct rotational dynamics of membrane fragments and internal chromophores.
    • These findings provide insights into the molecular mechanisms of membrane protein behavior under external fields.

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