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Related Experiment Videos

Light-dependent proton efflux from chloroplast thylakoids.

M S Abbott, R A Dilley

    Archives of Biochemistry and Biophysics
    |April 1, 1983
    PubMed
    Summary

    This study reveals a proton efflux pathway through spinach chloroplast coupling factor (CF1) in both light and dark conditions. This pathway is linked to adenine nucleotide exchange and conformational changes in CF1, impacting proton conductivity.

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    Distinguishing between luminal and localized proton buffering pools in thylakoid membranes.

    Plant physiology·2000

    Area of Science:

    • Plant Physiology
    • Bioenergetics
    • Membrane Transport

    Background:

    • Proton conductivity in thylakoid membranes is crucial for ATP synthesis.
    • Estimating proton fluxes requires separating influx and efflux rates.
    • The role of coupling factor 1 (CF1) in proton transport is not fully understood.

    Purpose of the Study:

    • To differentiate proton influx and efflux rate constants in spinach chloroplast thylakoid membranes.
    • To investigate the role of coupling factor 1 (CF1) in light and dark proton efflux.
    • To explore the relationship between proton flux, CF1, and adenine nucleotide exchange.

    Main Methods:

    • Kinetic analysis to separate proton influx and efflux rate constants.
    • Utilizing dicyclohexylcarbodiimide (DCCD) to inhibit proton channel function.
    • Employing antibodies against CF1 to assess its role in proton efflux.

    Main Results:

    • A method was developed to separate proton influx and efflux rate constants.
    • DCCD inhibited proton efflux in both light and dark conditions.
    • Antibodies against CF1 inhibited light-dependent proton efflux but not dark efflux.
    • Proton efflux through CF1 correlated with adenine nucleotide exchange activity.

    Conclusions:

    • A proton efflux pathway exists through the CF1 complex in both light and dark.
    • This pathway is associated with conformational changes in CF1, potentially conserving energy.
    • Proton electrochemical gradients may drive conformational changes and nucleotide exchange in CF1.

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