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- W196137726 abstract "We investigated the effect of compatible and non-compatible osmolytes in combination with macromolecular crowding on the kinetics of yeast hexokinase. This was motivated by the fact that almost all studies concerning the osmolyte effects on enzyme activity have been performed in diluted buffer systems, which are far from the physiological conditions within cells, where the cytosol contains several hundred mg protein ml− 1. Four organic (glycerol, betaine, TMAO and urea) and one inorganic (NaCl) osmolyte were tested. It was concluded that the effect of compatible osmolytes (glycerol, betaine and TMAO) on Vmax and KM was practically equivalent in pure buffer and in 200–250 mg BSA ml− 1 supporting the view that these small organic osmolytes do minimal perturbance on enzyme function in physiological solutions. The effect of urea on enzyme kinetics was not independent of protein concentration, since the presence of 250 mg BSA ml− 1 partly compensated the perturbing effect of urea. Even though the organic osmolytes glycerol, betaine and TMAO are generally considered compatible with enzyme function, especially glycerol did have a significant effect on hexokinase kinetics, decreasing both kcat, KM and kcat/KM. The osmolytes decreased kcat/KM in the order: NaCl > Urea > TMAO/glycerol > betaine. For the organic osmolytes this order correlates with the degree of exclusion from protein–water interfaces. Thus, the stronger the exclusion the weaker the perturbing effects on kcat/KM." @default.
- W196137726 created "2016-06-24" @default.
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- W196137726 date "2007-10-01" @default.
- W196137726 modified "2023-10-12" @default.
- W196137726 title "Effects of osmolytes on hexokinase kinetics combined with macromolecular crowding" @default.
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- W196137726 doi "https://doi.org/10.1016/j.cbpa.2007.05.009" @default.
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