کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5371150 | 1503936 | 2013 | 11 صفحه PDF | دانلود رایگان |

New understanding of the fundamental links between protein stability, conformational flexibility and function, can be gained through synergic studies on their catalytic and folding/unfolding properties under the influence of stabilizing/destabilizing additives. We explored an impact of dimethyl sulfoxide (DMSO), the moderate effector of multilateral action, on the kinetic (functional) and thermodynamic (thermal unfolding) patterns of a hydrolytic enzyme, α-chymotrypsin (α-CT), over a wide range of additive concentrations, 0-70% (v/v). Both the calorimetric and kinetic data exhibited rich behavior pointing to the complex interplay of global/local stability (and flexibility) patterns. The complex action of DMSO is explained through the negative and positive preferential solvation motifs that prevail for the extreme opposite, native-like and unfolded states, respectively, implying essential stabilization of compact domains by enhancement of interfacial water networks and destabilization of a flexible active site by direct binding of DMSO to the unoccupied specific positions intended for elongated polypeptide substrates.
Highlights⺠Impact of dimethyl sulfoxide on the catalytic (kinetic) pattern of α-chymotrypsin ⺠Impact of dimethyl sulfoxide on the unfolding/refolding pattern of α-chymotrypsin ⺠Interplay of stabilizing/destabilizing effects and global/local stability motifs
Journal: Biophysical Chemistry - Volumes 175â176, MayâJune 2013, Pages 17-27