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Interconversions of P and F intermediates of cytochrome c oxidase from Paracoccus denitrificans

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von der Hocht,  Iris
Department of Molecular Membrane Biology, Max Planck Institute of Biophysics, Max Planck Society;

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Hilbers,  Florian
Department of Molecular Membrane Biology, Max Planck Institute of Biophysics, Max Planck Society;

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Angerer,  Heike
Department of Molecular Membrane Biology, Max Planck Institute of Biophysics, Max Planck Society;

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Michel,  Hartmut
Department of Molecular Membrane Biology, Max Planck Institute of Biophysics, Max Planck Society;

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Citation

von der Hocht, I., van Wonderen, J. H., Hilbers, F., Angerer, H., MacMillan, F., & Michel, H. (2011). Interconversions of P and F intermediates of cytochrome c oxidase from Paracoccus denitrificans. Proceedings of the National Academy of Sciences of the United States of America, 108(10), 3964-3969. doi:10.1073/pnas.1100950108.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0024-D5F8-9
Abstract
Cytochrome c oxidase (CcO) is the terminal enzyme of the respiratory chain. This redox-driven proton pump catalyzes the fourelectron reduction of molecular oxygen to water, one of the most fundamental processes in biology. Elucidation of the intermediate structures in the catalytic cycle is crucial for understanding both the mechanism of oxygen reduction and its coupling to proton pumping. Using CcO from Paracoccus denitrificans, we demonstrate that the artificial F state, classically generated by reaction with an excess of hydrogen peroxide, can be converted into a new P state (in contradiction to the conventional direction of the catalytic cycle) by addition of ammonia at pH 9. We suggest that ammonia coordinates directly to CuB in the binuclear active center in this P state and discuss the chemical structures of both oxoferryl intermediates F and P. Our results are compatible with a superoxide bound to CuB in the F state.