Noncovalent Interactions between Trimethylamine N-Oxide (TMAO), Urea, and WaterClick to copy article linkArticle link copied!
- Sarah G. ZetterholmSarah G. ZetterholmDepartment of Chemistry and Biochemistry, Mississippi College, P.O. Box 4036, Clinton, Mississippi 39058, United StatesMore by Sarah G. Zetterholm
- Genevieve A. VervilleGenevieve A. VervilleDepartment of Chemistry and Biochemistry, University of Mississippi, P.O. Box 1848, University, Mississippi 38655, United StatesMore by Genevieve A. Verville
- Leeann BoutwellLeeann BoutwellDepartment of Chemistry and Biochemistry, Mississippi College, P.O. Box 4036, Clinton, Mississippi 39058, United StatesMore by Leeann Boutwell
- Christopher BolandChristopher BolandDepartment of Chemistry and Biochemistry, University of Mississippi, P.O. Box 1848, University, Mississippi 38655, United StatesMore by Christopher Boland
- John C. PratherJohn C. PratherDepartment of Chemistry and Biochemistry, University of Mississippi, P.O. Box 1848, University, Mississippi 38655, United StatesMore by John C. Prather
- Jonathan BetheaJonathan BetheaDepartment of Chemistry and Biochemistry, Mississippi College, P.O. Box 4036, Clinton, Mississippi 39058, United StatesMore by Jonathan Bethea
- Jordan CauleyJordan CauleyDepartment of Chemistry and Biochemistry, University of Mississippi, P.O. Box 1848, University, Mississippi 38655, United StatesDepartment of Chemistry and Biochemistry, Mississippi College, P.O. Box 4036, Clinton, Mississippi 39058, United StatesMore by Jordan Cauley
- Kayla E. WarrenKayla E. WarrenDepartment of Chemistry and Biochemistry, University of Mississippi, P.O. Box 1848, University, Mississippi 38655, United StatesMore by Kayla E. Warren
- Shelley A. SmithShelley A. SmithDepartment of Chemistry and Biochemistry, Mississippi College, P.O. Box 4036, Clinton, Mississippi 39058, United StatesMore by Shelley A. Smith
- David H. MagersDavid H. MagersDepartment of Chemistry and Biochemistry, Mississippi College, P.O. Box 4036, Clinton, Mississippi 39058, United StatesMore by David H. Magers
- Nathan I. Hammer*Nathan I. Hammer*E-mail: [email protected]Department of Chemistry and Biochemistry, University of Mississippi, P.O. Box 1848, University, Mississippi 38655, United StatesMore by Nathan I. Hammer
Abstract

Trimethylamine N-oxide (TMAO) and urea are two important osmolytes with their main significance to the biophysical field being in how they uniquely interact with proteins. Urea is a strong protein destabilizing agent, whereas TMAO is known to counteract urea’s deleterious effects. The exact mechanisms by which TMAO stabilizes and urea destabilizes folded proteins continue to be debated in the literature. Although recent evidence has suggested that urea binds directly to amino acid side chains to make protein folding less thermodynamically favored, it has also been suggested that urea acts indirectly to denature proteins by destabilizing the surrounding hydrogen bonding water networks. Here, we elucidate the molecular level mechanism of TMAO’s unique ability to counteract urea’s destabilizing nature by comparing Raman spectroscopic frequency shifts to the results of electronic structure calculations of microsolvated molecular clusters. Experimental and computational data suggest that the addition of TMAO into an aqueous solution of urea induces blue shifts in urea’s H-N-H symmetric bending modes, which is evidence for direct interactions between the two cosolvents.
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