Ultrafast Hydration Dynamics in Melittin Folding and Aggregation:  Helix Formation and Tetramer Self-Assembly

2005 ◽  
Vol 109 (35) ◽  
pp. 16901-16910 ◽  
Author(s):  
Weihong Qiu ◽  
Luyuan Zhang ◽  
Ya-Ting Kao ◽  
Wenyun Lu ◽  
Tanping Li ◽  
...  
Keyword(s):  
Self Assembly ◽  
Helix Formation ◽  
Ultrafast Hydration ◽  
Hydration Dynamics

scholarly journals Interactions of RNA and Water probed by 2D-IR Spectroscopy

2019 ◽  
Vol 205 ◽  
pp. 10003
Author(s):  
Benjamin P. Fingerhut ◽  
Eva M. Bruening ◽  
Jakob Schauss ◽  
Torsten Siebert ◽  
Thomas Elsaesser
Keyword(s):  
Ir Spectroscopy ◽  
Boundary Conditions ◽  
Theoretical Investigation ◽  
Double Helix ◽  
Water Molecules ◽  
2D Ir ◽  
Ultrafast Hydration ◽  
Hydration Dynamics

Combined experimental-theoretical investigation of ultrafast hydration dynamics of an A-form RNA double helix in water reveals an ordered arrangement of water molecules and provides boundary conditions for the ion atmosphere around the polyanionic RNA.

scholarly journals Supramolecular super-helix formation via self-assembly of naphthalene diimide functionalised with bile acid derivatives

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Sopan M. Wagalgave ◽  
Sachin D. Padghan ◽  
Mahesh D. Burud ◽  
Mohammad Al Kobaisi ◽  
Duong Duc La ◽  
...  
Keyword(s):  
Bile Acid ◽  
Self Assembly ◽  
Helix Formation ◽  
Naphthalene Diimide ◽  
Bile Acid Derivatives

Ultrafast Hydration Dynamics in the Lipidic Cubic Phase:  Discrete Water Structures in Nanochannels

2006 ◽  
Vol 110 (43) ◽  
pp. 21994-22000 ◽  
Author(s):  
Jongjoo Kim ◽  
Wenyun Lu ◽  
Weihong Qiu ◽  
Lijuan Wang ◽  
Martin Caffrey ◽  
...  
Keyword(s):  
Cubic Phase ◽  
Lipidic Cubic Phase ◽  
Ultrafast Hydration ◽  
Hydration Dynamics

scholarly journals Hydrophobic interactions control the self-assembly of DNA and cellulose

2021 ◽  
Vol 54 ◽  
Author(s):  
Björn Lindman ◽  
Bruno Medronho ◽  
Luís Alves ◽  
Magnus Norgren ◽  
Lars Nordenskiöld
Keyword(s):  
Hydrogen Bonding ◽  
Self Assembly ◽  
Hydrophobic Interactions ◽  
Double Helix ◽  
The Self ◽  
Biological Macromolecules ◽  
Helix Formation ◽  
Assembly Features ◽  
Pertinent Information ◽  
Net Charges

Abstract Desoxyribosenucleic acid, DNA, and cellulose molecules self-assemble in aqueous systems. This aggregation is the basis of the important functions of these biological macromolecules. Both DNA and cellulose have significant polar and nonpolar parts and there is a delicate balance between hydrophilic and hydrophobic interactions. The hydrophilic interactions related to net charges have been thoroughly studied and are well understood. On the other hand, the detailed roles of hydrogen bonding and hydrophobic interactions have remained controversial. It is found that the contributions of hydrophobic interactions in driving important processes, like the double-helix formation of DNA and the aqueous dissolution of cellulose, are dominating whereas the net contribution from hydrogen bonding is small. In reviewing the roles of different interactions for DNA and cellulose it is useful to compare with the self-assembly features of surfactants, the simplest case of amphiphilic molecules. Pertinent information on the amphiphilic character of cellulose and DNA can be obtained from the association with surfactants, as well as on modifying the hydrophobic interactions by additives.

Triple Helix Formation in Amphiphilic Discotics: Demystifying Solvent Effects in Supramolecular Self-Assembly

2013 ◽  
Vol 136 (1) ◽  
pp. 336-343 ◽  
Author(s):  
Martijn A. J. Gillissen ◽  
Marcel M. E. Koenigs ◽  
Jolanda J. H. Spiering ◽  
Jef A. J. M. Vekemans ◽  
Anja R. A. Palmans ◽  
...  
Keyword(s):  
Solvent Effects ◽  
Self Assembly ◽  
Triple Helix ◽  
Helix Formation ◽  
Triple Helix Formation

Cooperative self-assembly of cyanines on carboxymethylamylose and other anionic scaffolds as tools for fluorescence-based biochemical sensing

2006 ◽  
Vol 78 (12) ◽  
pp. 2313-2323 ◽  
Author(s):  
David G. Whitten ◽  
Komandoor E. Achyuthan ◽  
Gabriel P. Lopez ◽  
Oh-Kil Kim
Keyword(s):  
Conformational Changes ◽  
Self Assembly ◽  
Random Coil ◽  
Helical Structures ◽  
Force Microscopy ◽  
Helix Formation ◽  
Biochemical Sensing ◽  
Sensing Applications ◽  
Atomic Force ◽  
J Aggregates

We recently found that certain cyanines form tight complexes with carboxymethylamylose (CMA) in aqueous solutions and that in these complexes the cyanine exists as a strongly fluorescent and stable J-aggregate. Cyanine dyes are characterized by their ability to form J-aggregates showing very narrow absorption and fluorescence spectra relative to the monomer. Although they have found uses in sensing applications, the practicability has been limited in many cases due to the low quantum efficiencies for J-aggregate fluorescence. The CMA-cyanine complex is formed by a cooperative self-assembly in which both components undergo conformational changes during the association. The CMA exists as a random coil in solution prior to complex formation; helix formation is prevented due to repulsion of the charges on the carboxymethylated glucose units. The cyanine exists as a nonfluorescent monomer in the same solutions. A helical atomic force microscopy image and large induced circular dichroism (CD) spectra of the cyanine J-aggregate indicate that the self-assembly is a superhelix scaffold of CMA decorated with J-aggregates of the cyanine. Similar behavior was also observed with carboxymethylated cellulose (CMC). Enzymatic disruption of the helical structures (e.g., by the use of amylase to disrupt the structure of CMA helix) leads to the disappearance of the J-aggregate-associated fluorescence. The photophysical behavior and applications of this complex for sensing are discussed.

Ultrafast hydration dynamics in protein conformational transitions

2006 ◽  
pp. 411-414
Author(s):  
Weihong Qiu ◽  
Luyuan Zhang ◽  
Lijuan Wang ◽  
Dongping Zhong
Keyword(s):  
Conformational Transitions ◽  
Ultrafast Hydration ◽  
Hydration Dynamics
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