Aqueous Urea Solutions: Structure, Energetics, and Urea Aggregation
نویسندگان
چکیده
منابع مشابه
Aqueous urea solutions: structure, energetics, and urea aggregation.
Urea is ubiquitously used as a protein denaturant. To study the structure and energetics of aqueous urea solutions, we have carried out molecular dynamics simulations for a wide range of urea concentrations and temperatures. The hydrogen bonds between urea and water were found to be significantly weaker than those between water molecules, which drives urea self-aggregation due to the hydrophobi...
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The structural and energetic properties of solutions containing water, urea, and trimethylamine-N-oxide (TMAO) are examined using molecular dynamics simulations. Such systems are of interest mainly because TMAO acts to counter the protein denaturing effect of urea. Even at relatively high concentration, TMAO is found to fit well into the urea-water structure. The underlying solution structure i...
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Urea plays various roles in the biology of diverse organisms. The past decade has produced new information on the molecular structure of several urea transporters in various species. Availability of DNA probes has revealed that the presence of urea transporters is not confined to the mammalian kidney but is also evident in testis and brain, raising new questions about the possible physiological...
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Densities and viscosities of aqueous solutions of urea and guanidine hydrochloride at 250 have been measured, and equations are presented which describe their variation with concentration. Densities and viscosities of similar solutions containing additional solutes (buffers, NaCI, -mercaptoethanol) have been measured, and the possibility of predicting these results from information on solutions...
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Human serum amyloid A protein (apo-SAA) can be prepared by gel filtration of delipidated acute-phase high-density lipoprotein in the presence of urea. The resultant apo-SAA is soluble (greater than 90% solubility) in a wide range of buffer solutions, with all of the six major isoforms of apo-SAA being equally soluble. In urea-containing solutions the isoforms behave qualitatively differently in...
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ژورنال
عنوان ژورنال: The Journal of Physical Chemistry B
سال: 2007
ISSN: 1520-6106,1520-5207
DOI: 10.1021/jp066474n