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Coupling Proton Movement to ATP Synthesis in the Chloroplast ATP Synthase

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The chloroplast F0F1-ATP synthase-ATPase is a tiny rotary motor responsible for coupling ATP synthesis and hydrolysis to the light-driven electrochemical proton gradient. Reversible oxidation/reduction of a dithiol, located within a special regulatory domain of the γ subunit of the chloroplast F1 enzyme, switches the enzyme between an inactive and an active state. This regulatory mechanism is unique to the ATP synthases of higher plants and its physiological significance lies in preventing nonproductive depletion of essential ATP pools in the dark. The three-dimensional structure of the chloroplast F1 gamma subunit has not yet been solved. To examine the mechanism of dithiol regulation, a model of the chloroplast gamma subunit was obtained through segmental homology modeling based on the known structures of the mitochondrial and bacterial γ subunits, together with de novo construction of the unknown regulatory domain. The model has provided considerable insight into how the dithiol might modulate catalytic function. This has, in turn, suggested a mechanism by which rotation of subunits in F0, the transmembrane proton channel portion of the enzyme, can be coupled, via the ε subunit, to rotation of the γ subunit of F1 to achieve the 120° (or 90°+30°) stepping action that is characteristic of F1 γ subunit rotation.

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Authors and Affiliations

  1. Departments of Chemistry and Molecular Biosciences, The University of Kansas, Lawrence, Kansas, 66045

    Mark L. Richter, Hardeep S. Samra, Feng He, Andrew J. Giessel & Krzysztof K. Kuczera

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  1. Mark L. Richter
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  2. Hardeep S. Samra
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  3. Feng He
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  4. Andrew J. Giessel
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  5. Krzysztof K. Kuczera
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Correspondence to Mark L. Richter.

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Richter, M.L., Samra, H.S., He, F. et al. Coupling Proton Movement to ATP Synthesis in the Chloroplast ATP Synthase. J Bioenerg Biomembr 37, 467–473 (2005). https://doi.org/10.1007/s10863-005-9493-9

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