Human aquaporin 4 has been studied using non-equilibrium molecular dynamics simulations in the absence and presence of pulses of external electric fields. The pulses were 100 ns in duration and 0.005-0.015 V/angstrom in intensity acting along the pores' axes. Water diffusivity and the dipolar response of various residues of interest within the pores have been studied. Results show relatively little change in levels of water permeability per se within aquaporin channels during axially oriented field impulses, although care must be taken with regard to statistical certainty. However, the spatial variation of water permeability vis-a-vis electric-field intensity within the milieu of the channels, as revealed by heterogeneity in diffusivity-map gradients, indicates the possibility of somewhat enhanced diffusivity, owing to several residues being affected substantially by external fields, particularly for HIS 201 and 95 and ILE 93. This has the effect of increasing slightly intra-pore water diffusivity in the "pore-mouths" locale, albeit rendering it more spatially uniform overall vis-a-vis zero-field conditions (via manipulation of the selectivity filter). Published by AIP Publishing.

Human aquaporin 4 gating dynamics under axially oriented electric-field impulses: A non-equilibrium molecular-dynamics study / Bernardi, M.; Marracino, P.; Ghaani, M. R.; Liberti, M.; Del Signore, F.; Burnham, C. J.; Garate, J. -A.; Apollonio, F.; English, N. J.. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - 149:24(2018), pp. 1-10. [10.1063/1.5044665]

Human aquaporin 4 gating dynamics under axially oriented electric-field impulses: A non-equilibrium molecular-dynamics study

Liberti M.;Del Signore F.;Apollonio F.;
2018

Abstract

Human aquaporin 4 has been studied using non-equilibrium molecular dynamics simulations in the absence and presence of pulses of external electric fields. The pulses were 100 ns in duration and 0.005-0.015 V/angstrom in intensity acting along the pores' axes. Water diffusivity and the dipolar response of various residues of interest within the pores have been studied. Results show relatively little change in levels of water permeability per se within aquaporin channels during axially oriented field impulses, although care must be taken with regard to statistical certainty. However, the spatial variation of water permeability vis-a-vis electric-field intensity within the milieu of the channels, as revealed by heterogeneity in diffusivity-map gradients, indicates the possibility of somewhat enhanced diffusivity, owing to several residues being affected substantially by external fields, particularly for HIS 201 and 95 and ILE 93. This has the effect of increasing slightly intra-pore water diffusivity in the "pore-mouths" locale, albeit rendering it more spatially uniform overall vis-a-vis zero-field conditions (via manipulation of the selectivity filter). Published by AIP Publishing.
2018
aquaporin 4; electricity; humans; permeability; water; molecular dynamics simulation
01 Pubblicazione su rivista::01a Articolo in rivista
Human aquaporin 4 gating dynamics under axially oriented electric-field impulses: A non-equilibrium molecular-dynamics study / Bernardi, M.; Marracino, P.; Ghaani, M. R.; Liberti, M.; Del Signore, F.; Burnham, C. J.; Garate, J. -A.; Apollonio, F.; English, N. J.. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - 149:24(2018), pp. 1-10. [10.1063/1.5044665]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1329020
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