Abstract
Proton pumping NADH:ubiquinone oxidoreductase (complex I) is the most complicated and least understood enzyme of the respiratory chain. All redox prosthetic groups reside in the peripheral arm of the L-shaped structure. The NADH oxidation domain harbouring the FMN cofactor is connected via a chain of iron–sulfur clusters to the ubiquinone reduction site that is located in a large pocket formed by the PSST- and 49-kDa subunits of complex I. An access path for ubiquinone and different partially overlapping inhibitor binding regions were defined within this pocket by site directed mutagenesis. A combination of biochemical and single particle analysis studies suggests that the ubiquinone reduction site is located well above the membrane domain. Therefore, direct coupling mechanisms seem unlikely and the redox energy must be converted into a conformational change that drives proton pumping across the membrane arm. It is not known which of the subunits and how many are involved in proton translocation. Complex I is a major source of reactive oxygen species (ROS) that are predominantly formed by electron transfer from FMNH2. Mitochondrial complex I can cycle between active and deactive forms that can be distinguished by the reactivity towards divalent cations and thiol-reactive agents. The physiological role of this phenomenon is yet unclear but it could contribute to the regulation of complex I activity in-vivo.
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Zickermann, V., Dröse, S., Tocilescu, M.A. et al. Challenges in elucidating structure and mechanism of proton pumping NADH:ubiquinone oxidoreductase (complex I). J Bioenerg Biomembr 40, 475–483 (2008). https://doi.org/10.1007/s10863-008-9171-9
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DOI: https://doi.org/10.1007/s10863-008-9171-9