Jump to main content
Jump to site search

Issue 23, 2014
Previous Article Next Article

The weak, fluctuating, dipole moment of membrane-bound hydrogenase from Aquifex aeolicus accounts for its adaptability to charged electrodes

Author affiliations

Abstract

[NiFe] hydrogenases from Aquifex aeolicus (AaHase) and Desulfovibrio fructosovorans (DfHase) have been mainly studied to characterize physiological electron transfer processes, or to develop biotechnological devices such as biofuel cells. In this context, it remains difficult to control the orientation of AaHases on electrodes to achieve a fast interfacial electron transfer. Here, we study the electrostatic properties of these two proteins based on microsecond-long molecular dynamics simulations that we compare to voltammetry experiments. Our calculations show weak values and large fluctuations of the dipole direction in AaHase compared to DfHase, enabling the AaHase to absorb on both negatively and positively charged electrodes, with an orientation distribution that induces a spread in electron transfer rates. Moreover, we discuss the role of the transmembrane helix of AaHase and show that it does not substantially impact the general features of the dipole moment.

Graphical abstract: The weak, fluctuating, dipole moment of membrane-bound hydrogenase from Aquifex aeolicus accounts for its adaptability to charged electrodes

Back to tab navigation

Supplementary files

Publication details

The article was received on 04 Feb 2014, accepted on 18 Apr 2014 and first published on 25 Apr 2014


Article type: Paper
DOI: 10.1039/C4CP00510D
Author version available: Download Author version (PDF)
Citation: Phys. Chem. Chem. Phys., 2014,16, 11318-11322
  •   Request permissions

    The weak, fluctuating, dipole moment of membrane-bound hydrogenase from Aquifex aeolicus accounts for its adaptability to charged electrodes

    F. Oteri, A. Ciaccafava, A. D. Poulpiquet, M. Baaden, E. Lojou and S. Sacquin-Mora, Phys. Chem. Chem. Phys., 2014, 16, 11318
    DOI: 10.1039/C4CP00510D

Search articles by author

Spotlight

Advertisements