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- W2037661666 abstract "The terminal respiratory enzyme cytochrome c oxidase (CcO) reduces molecular oxygen to water, and pumps protons across the inner mitochondrial membrane, or the plasma membrane of bacteria. A two-subunit CcO harbors all the elements necessary for oxygen reduction and proton pumping. However, it rapidly undergoes turnover-induced irreversible damage, which is effectively prevented by the presence of subunit III and its tightly bound lipids. We have performed classical atomistic molecular dynamics (MD) simulations on a three-subunit CcO, which show the formation of water wires between the polar head groups of lipid molecules bound to subunit III and the proton uptake site Asp91 (Bos taurus enzyme numbering). Continuum electrostatic calculations suggest that these lipids directly influence the proton affinity of Asp91 by 1–2 pK units. We surmise that lipids bound to subunit III influence the rate of proton uptake through the D-pathway, and therefore play a key role in preventing turnover-induced inactivation. Atomistic MD simulations show that subunit III is rapidly hydrated in the absence of internally bound lipids, which is likely to affect the rate of O2 diffusion into the active-site. The role of subunit III with its indigenous lipids in the molecular mechanism of CcO is discussed." @default.
- W2037661666 created "2016-06-24" @default.
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- W2037661666 date "2015-08-01" @default.
- W2037661666 modified "2023-10-03" @default.
- W2037661666 title "Role of subunit III and its lipids in the molecular mechanism of cytochrome c oxidase" @default.
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- W2037661666 doi "https://doi.org/10.1016/j.bbabio.2015.04.007" @default.
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