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• W2333862514 abstract "The competing interactions folding and unfolding protein structure remain obscure. Using homopolypeptides, we ask if poly-l structure may have a role. We mutate the structure to alternating-l,d stereochemistry and substitute water as the fold-promoting solvent with methanol and dimethyl sulfoxide (DMSO) as the fold-denaturing solvents. Circular dichroism and molecular dynamics established previously that, while both isomers were folded in water, the poly-l isomer was unfolded and alternating-l,d isomer folded in methanol. Nuclear magnetic resonance and molecular dynamics establish now that both isomers are unfolded in DMSO. We calculated energetics of folding–unfolding equilibrium with water and methanol as solvents. We have now calculated interactions of unfolded polypeptide structures with DMSO as solvent. Methanol was found to unfold and water fold poly-l structure as a dielectric. DMSO has now been found to unfold both poly-l and alternating-l,d structures by strong solvation of peptides to disrupt their hydrogen bonds. Accordingly, we propose that while linked peptides fold protein structure with hydrogen bonds they unfold the structure electrostatically due to the stereochemical effect of the poly-l structure. Protein folding to ordering of peptide hydrogen bonds with water as canonical solvent may thus involve two specific and independent solvent effects—one, strong screening of electrostatics of poly-l linked peptides, and two, weak dipolar solvation of peptides. Correspondingly, protein denaturation may involve two independent solvent effects—one, weak dielectric to unfold poly-l structure electrostatically, and two, strong polarity to disrupt peptide hydrogen bonds by solvation of peptides." @default.
• W2333862514 created "2016-06-24" @default.
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• W2333862514 creator A5056684277 @default.
• W2333862514 creator A5082458139 @default.
• W2333862514 date "2011-04-29" @default.
• W2333862514 modified "2023-09-26" @default.
• W2333862514 title "Stereochemistry and Solvent Role in Protein Folding: Nuclear Magnetic Resonance and Molecular Dynamics Studies of Poly-<scp>l</scp> and Alternating-<scp>l</scp>,<scp>d</scp> Homopolypeptides in Dimethyl Sulfoxide" @default.
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• W2333862514 doi "https://doi.org/10.1021/jp200743w" @default.
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