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A stable water chain in the hydrophobic pore of the AmtB ammonium transporter

Lamoureux, Guillaume and Klein, Michael L. and Bernèche, Simon. (2007) A stable water chain in the hydrophobic pore of the AmtB ammonium transporter. Biophysical journal, Vol. 92, H. 9 , L82-L84.

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Official URL: http://edoc.unibas.ch/dok/A5249309

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Abstract

The accessibility of water molecules to the pore of the AmtB ammonium transporter is studied using molecular dynamics simulations. Free energy calculations show that the so-called hydrophobic pore can stabilize a chain of water molecules in a well of a few kcal/mol, using a favorable electrostatic binding pocket as an anchoring point. Moreover, the structure of the water chain matches precisely the electronic density maxima observed in x-ray diffraction experiments. This result questions the general assumption that the AmtB pore only contains ammonia (NH(3)) molecules diffusing in a single file fashion. The probable presence of water molecules in the pore would influence the relative stability of NH(3) and NH(4)(+), and thus calls for a reassessment of the overall permeation mechanism in ammonium transporters.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Computational Biophysics (Bernèche)
UniBasel Contributors:Bernèche, Simon
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Biophysical Society
ISSN:0006-3495
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:21 Jun 2013 12:27
Deposited On:22 Mar 2012 13:16

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