Cited Article: Saparov, S. Mobility of a one-dimensional confined file of water molecules as a function of file length
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Title:
Characterization of Water Wires inside Hydrophobic Tubular Peptide Structures
Authors:
Raghavender, US; Aravinda, S; Shamala, N; Kantharaju; Rai, R; Balaram, P
Author Full Names:
Raghavender, Upadhyayula S.; Aravinda, Subrayashastry; Shamala, Narayanaswamy; Kantharaju; Rai, Rajkishor; Balaram, Padmanabhan
Source:
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 131 (42): 15130-+ OCT 28 2009
Language:
English
Document Type:
Article
KeyWords Plus:
CARBON NANOTUBES; CHANNELS; DYNAMICS
Abstract:
The crystallographic observation of a hydrophobic, empty channel (diameter similar to 5.2 angstrom) in the peptide Boc-(D)Pro-Aib-Leu-Aib-Val-OMe, prompted the investigation of the analog Boc-(D)Pro-Aib-Val-Aib-Val-OMe in which the side chain at position 3 was shortened, resulting in the structure of a channel (diameter similar to 7.5 angstrom) containing a one-dimensional wire of water molecules. Crystallization in the space group P6(5) facilitates formation of a pore tined entirety by hydrocarbon side chains. Two forms of the entrapped water wires, with O center dot center dot center dot O separations of 3.5 and 2.6 angstrom, are discussed. A lone hydrogen bond between the adjacent pairs of water molecules in the wire, with no strong interactions between the second water hydrogen and the hydrophobic walls of the channel, is a feature of the one-dimensional array. The structure provides the first crystallographic characterization of a water wire in a hydrophobic channel wit!
h implications in water and proton transport in membranes and carbon nanotubes
Reprint Address:
Shamala, N, Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India.
Research Institution addresses:
[Raghavender, Upadhyayula S.; Aravinda, Subrayashastry; Shamala, Narayanaswamy] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India; [Kantharaju; Rai, Rajkishor; Balaram, Padmanabhan] Indian Inst Sci, Mol Biophys Unit, Bangalore 560012, Karnataka, India
E-mail Address:
shamala@physics.iisc.ernet.in; pb@mbu.iisc.ernet.in
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Cited Reference Count:
23
Times Cited:
0
Publisher:
AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Subject Category:
Chemistry, Multidisciplinary
ISSN:
0002-7863
DOI:
10.1021/ja9038906
IDS Number:
512SX
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