Application of classical molecular dynamics for evaluation of proton transfer mechanism on a protein

Ran Friedman, Esther Nachliel, Menachem Gutman

Research output: Contribution to journalArticlepeer-review

Abstract

Proton transfer reactions on surfaces are prevalent in biology, chemistry and physics. In the present study, we employed classical Molecular Dynamics simulations to search for the presence of transient configurations that enable proton transfer, or proton sharing, between adjacent carboxylate groups on the protein surface. The results demonstrate that, during random fluctuations of the residues on the surface, there are repeated situations in which nearby carboxylates either share a common proton through a hydrogen bond, or are connected by a few water molecules that form conducting networks. These networks do not extend out of the common Coulomb cage of the participating residues and the lifetimes of the bridged structures are sufficiently long to allow passage of a proton between the carboxylates. The detection of domains capable of supporting a rapid proton transfer on a protein supports the notion that clusters of carboxylates are the operative elements of proton collecting antennae, as in bacteriorhodopsin, cytochrome c oxidase or the photosynthetic reaction center.

Original languageEnglish
Pages (from-to)67-77
Number of pages11
JournalBiochimica et Biophysica Acta - Bioenergetics
Volume1710
Issue number2-3
DOIs
StatePublished - 20 Dec 2005

Keywords

  • Molecular dynamics
  • Protein surface
  • Proton transfer

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