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- W2269953921 abstract "Nitrilases are an important class of industrial enzymes. They require mild reaction conditions and are highly efficient and environmentally friendly, so they are used to catalyze the synthesis of carboxylic acid from nitrile, a process considered superior to conventional chemical syntheses. Nitrilases should be immobilized to overcome difficulties in recovery after the reaction and to stabilize the free enzyme. The nitrilase from<i> Clostridium thermocellum</i> was expressed, identified and displayed on the surface of <i>Bacillus subtilis </i>spores by using the spore coat protein G of <i>B. subtilis </i>as an anchoring motif. In a free state, the recombinant nitrilase catalyzed the conversion of 3-cyanopyridine to niacin and displayed maximum catalytic activity (8.22 units/mg protein) at 40°C and pH 7.4. SDS-PAGE and Western blot were used to confirm nitrilase display. Compared with the free enzyme, the spore-immobilized nitrilase showed a higher tolerance for adverse environmental conditions. After the reaction, recombinant spores were recovered via centrifugation and reused 3 times to catalyze the conversion of 3-cyanopyridine with 75.3% nitrilase activity. This study demonstrates an effective means of nitrilase immobilization via spore surface display, which can be applied in biological processes or conversion." @default.
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- W2269953921 date "2015-01-01" @default.
- W2269953921 modified "2023-09-25" @default.
- W2269953921 title "<b><i>Clostridium thermocellum </i></b>Nitrilase Expression and Surface Display on <b><i>Bacillus subtilis</i></b> Spores" @default.
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- W2269953921 doi "https://doi.org/10.1159/000441642" @default.
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