The Journal of Membrane Biology

, Volume 248, Issue 3, pp 443–453 | Cite as

Dynamics of the Plasma Membrane Proton Pump

Article

Abstract

Proton transfer over distances longer than that of a hydrogen bond often requires water molecules and protein motions. Following transfer of the proton from the donor to the acceptor, the change in the charge distribution may alter the dynamics of protein and water. To begin to understand how protonation dynamics couple to protein and water dynamics, here we explore how changes in the protonation state affect water and protein dynamics in the AHA2 proton pump. We find that the protonation state of the proton donor and acceptor groups largely affects the dynamics of internal waters and of specific hydrogen bonds, and the orientation of transmembrane helical segments that couple remote regions of the protein. The primary proton donor/acceptor group D684, can interact with water molecules from the cytoplasmic bulk and/or other protein groups.

Keywords

Proton transfer Protein dynamics Dynamics of internal waters Hydrogen-bonding AHA2 proton pump 

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Theoretical Molecular Biophysics, Department of PhysicsFreie Universitaet BerlinBerlinGermany

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