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Title: Structural insights into functional properties of the oxidized form of cytochrome c oxidase

Journal Article · · Nature Communications

Abstract Cytochrome c oxidase (C c O) is an essential enzyme in mitochondrial and bacterial respiration. It catalyzes the four-electron reduction of molecular oxygen to water and harnesses the chemical energy to translocate four protons across biological membranes. The turnover of the C c O reaction involves an oxidative phase, in which the reduced enzyme (R) is oxidized to the metastable O H state, and a reductive phase, in which O H is reduced back to the R state. During each phase, two protons are translocated across the membrane. However, if O H is allowed to relax to the resting oxidized state (O), a redox equivalent to O H , its subsequent reduction to R is incapable of driving proton translocation. Here, with resonance Raman spectroscopy and serial femtosecond X-ray crystallography (SFX), we show that the heme a 3 iron and Cu B in the active site of the O state, like those in the O H state, are coordinated by a hydroxide ion and a water molecule, respectively. However, Y244, critical for the oxygen reduction chemistry, is in the neutral protonated form, which distinguishes O from O H , where Y244 is in the deprotonated tyrosinate form. These structural characteristics of O provide insights into the proton translocation mechanism of C c O.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; AC02-76SF00515
OSTI ID:
2000580
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 14; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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