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Crowders and Cosolvents-Major Contributors to the Cellular Milieu and Efficient Means to Counteract Environmental Stresses.
The free energy and conformational landscape of biomolecular systems as well as biochemical reactions depend not only on temperature and pressure, but also on the particular solution conditions. Such conditions include the effects of cosolvents (for example osmolytes) and macromolecular crowding, which are crucial components to understand the energetics and kinetics of biological processes in living system. Such conditions are also important for the understanding of many debilitating diseases, such as those where misfolding and amyloid formation of proteins are involved. Moreover, understanding their effects on biomolecular processes is prerequisite for designing industrially relevant enzymatic reactions, which seldom take place under neat conditions. Here, we review and discuss experimental and theoretical studies on the characterization of cosolvent and crowding induced effects in biologically relevant systems, approaching even the complexity of living organisms. In particular, we focus on cosolvent and crowding effects on the conformational equilibrium and folding kinetics of proteins and nucleic acids as well as on enzymatic reactions, including their effects on the temperature and pressure dependence of these processes. By presenting a few representative examples, we show how such effects are unveiled and described in thermodynamic and kinetic terms.
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