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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • Cytochrome c oxidase is crucial for cellular respiration, acting as both a redox enzyme and proton pump.
  • Proton transfer to the binuclear redox center (BNC) is essential for its function and occurs via D- and K-channels.
  • Regulation of proton transfer is vital for enzyme function and proton pumping across membranes.

Purpose of the Study:

  • To investigate the protonation-state-dependent interplay between the D- and K-channels in cytochrome c oxidase.
  • To elucidate the role of specific residues, K362 and N139, in regulating proton transfer pathways.
  • To understand the gating mechanism of proton flow through the D-channel.

Main Methods:

  • Utilized molecular dynamics simulations.
  • Examined 16 different protonation state combinations of key residues in the D- and K-channels.
  • Analyzed communication pathways, positional correlations, and hydrogen-bonded networks.

Main Results:

  • The K-channel's influence on the D-channel is dependent on residue protonation states.
  • Protonation of K362 affects the strength and means of communication within the channels.
  • Residue N139 acts as a gate, its conformation influenced by D-channel and K362 protonation, thereby regulating proton passage.

Conclusions:

  • Proton transfer regulation in cytochrome c oxidase involves intricate channel communication.
  • Residue K362 plays a key role in modulating channel interactions and proton transfer efficiency.
  • N139's gating function facilitates or hinders proton flow based on specific protonation states, impacting enzyme activity.