Cited Article: Saparov, S. Mobility of a one-dimensional confined file of water molecules as a function of file length
Alert Expires: 22 OCT 2009
Number of Citing Articles: 2 new records this week (2 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Teaching Old Coefficients New Tricks: New Insight into the Meaning of the Osmotic and Diffusive Permeation Coefficients
Authors:
Beckstein, O
Author Full Names:
Beckstein, Oliver
Source:
BIOPHYSICAL JOURNAL 96 (3): 763-764 FEB 4 2009
Language:
English
Document Type:
News Item
KeyWords Plus:
WATER; PORES
Reprint Address:
Beckstein, O, Univ Oxford, Dept Biochem, Struct Bioinformat & Computat Biochem Unit, Oxford OX1 3QU, England.
Research Institution addresses:
[Beckstein, Oliver] Univ Oxford, Dept Biochem, Struct Bioinformat & Computat Biochem Unit, Oxford OX1 3QU, England; [Beckstein, Oliver] Johns Hopkins Univ, Sch Med, Dept Physiol, Baltimore, MD 21205 USA
E-mail Address:
oliver.beckstein@bioch.ox.ac.uk
Cited References:
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ZHU FQ, 2004, PHYS REV LETT, V93, ARTN 224501.
Cited Reference Count:
9
Times Cited:
0
Publisher:
ELSEVIER SCI LTD; THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Subject Category:
Biophysics
ISSN:
0006-3495
DOI:
10.1016/j.bpj.2008.10.048
IDS Number:
450CB
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Title:
Determinants of Water Permeability through Nanoscopic Hydrophilic Channels
Authors:
Portella, G; de Groot, BL
Author Full Names:
Portella, Guillem; de Groot, Bert L.
Source:
BIOPHYSICAL JOURNAL 96 (3): 925-938 FEB 4 2009
Language:
English
Document Type:
Article
KeyWords Plus:
PARTICLE MESH EWALD; SINGLE-FILE PORE; MOLECULAR-DYNAMICS; GRAMICIDIN CHANNEL; PEPTIDE NANOTUBES; PROTON EXCLUSION; CARBON NANOTUBE; CELL-MEMBRANE; ION CHANNELS; FORCE-FIELD
Abstract:
Naturally occurring pores show a variety of polarities and sizes that are presumably directly linked to their biological function. Many biological channels are selective toward permeants similar or smaller in size than water molecules, and therefore their pores operate in the regime of single-file water pores. Intrinsic factors affecting water permeability through such pores include the channel-membrane match, the structural stability of the channel, the channel geometry and channel-water affinity. We present an extensive molecular dynamics study on the role of the channel geometry and polarity on the water osmotic and diffusive permeability coefficients. We show that the polarity of the naturally occurring peptidic channels is close to optimal for water permeation, and that the water mobility for a wide range of channel polarities is essentially length independent. By systematically varying the geometry and polarity of model hydrophilic pores, based on the fold of gramicidi!
n A, the water density, occupancy, and permeability are studied. Our focus is on the characterization of the transition between different permeation regimes in terms of the structure of water in the pores, the average pore occupancy and the dynamics of the permeating water molecules. We show that a general relationship between osmotic and diffusive water permeability coefficients in the single-file regime accounts for the time averaged pore occupancy, and that the dynamics of the permeating water molecules through narrow non single file channels effectively behaves like independent single-file columns.
Reprint Address:
de Groot, BL, Max Planck Inst Biophys Chem, Computat Biomol Dynam Grp, D-37077 Gottingen, Germany.
Research Institution addresses:
[Portella, Guillem; de Groot, Bert L.] Max Planck Inst Biophys Chem, Computat Biomol Dynam Grp, D-37077 Gottingen, Germany
E-mail Address:
bgroot@gwdg.de
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Cited Reference Count:
65
Times Cited:
0
Publisher:
ELSEVIER SCI LTD; THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Subject Category:
Biophysics
ISSN:
0006-3495
DOI:
10.1016/j.bpj.2008.09.059
IDS Number:
450CB
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