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- W2141333182 abstract "We studied the effects of increase in the number of surface arginines on the enzyme activity and stability of Trichoderma reesei endo-1,4-beta-xylanase II. The number of arginines was increased in two mutant series. The first set contained six arginines on different sides of the protein surface. These arginines had no significant effect on the thermostability. However, the optimal pH region became narrower. Another series of five arginines was engineered into the 'Ser/Thr surface', formed of part of the double-layered beta-sheet located on one side of the 'right-hand-like' xylanase. These mutations shifted the activity profile to the alkaline region by approximately 0.5-1.0 pH units. In addition, the arginines on the Ser/Thr surface increased the enzyme activity at high temperature, although the enzyme stability in the absence of substrate decreased significantly at 50-55 degrees C. In the presence of the substrate, the thermostability increased 4-5-fold at 60-65 degrees C. Thus, the substrate neutralized the destabilizing effect of Ser/Thr surface arginines and revealed a stabilizing effect of the same mutations. The stabilizing effect of arginines at high temperatures was seen clearly only when five arginines were introduced into the Ser/Thr surface." @default.
- W2141333182 created "2016-06-24" @default.
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- W2141333182 date "2002-02-01" @default.
- W2141333182 modified "2023-10-13" @default.
- W2141333182 title "Engineering of multiple arginines into the Ser/Thr surface of Trichoderma reesei endo-1,4-β-xylanase II increases the thermotolerance and shifts the pH optimum towards alkaline pH" @default.
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- W2141333182 doi "https://doi.org/10.1093/protein/15.2.141" @default.
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