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A saturation mutagenesis library was constructed at the position 329 of the endoglucanase CelA from Clostridium thermocellum based on previous results (Yi and Wu, 2010), and one mutation, S329G, was identified to contribute to the enhanced thermostability. The result inspired a rational design approach focusing on the introduction of Gly or Pro residue onto the protein surface, which led to the identification...
We constructed a library of chimeras from the major endoglucanase, CelA, of Clostridium thermocellum and a less stable endoglucanase CelB from Clostridium josui with multiple point mutations using low-fidelity family-shuffling method. Mutations that inactivated the enzyme were rapidly eliminated with high-throughput screening. The activities and thermostabilities of selected variants were evaluated,...
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