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The Protective Effects of Osmolytes on Yeast Alcohol Dehydrogenase Conformational Stability and Aggregation

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The protective effects of four osmolytes (trehalose, dimethysulfoxide, glycine and proline) on the conformational stability and aggregation of guanidine-denatured yeast alcohol dehydrogenase (YADH) have been investigated in this paper. The results show that the four osmolytes protect YADH against unfolding and inactivation by reducing ki (inactivation rate constants), increasing ΔΔGi (transition free energy changes at 25°C), increasing Cm (value for the midpoint of denaturation) and decreasing its ANS-binding fluorescence intensity. Furthermore, these osmolytes can prevent YADH aggregation in a concentration-dependent manner during YADH refolding.

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Keywords: Aggregation; conformational stability; osmolytes; transition free energy; unfolding; yeast alcohol dehydrogenase

Document Type: Research Article

Publication date: 2010-08-01

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.
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