[No authors listed]
Simultaneous improvements of thermostability and activity of a Ca-independent α-amylase from Bacillus subtilis CN7 were achieved by C-terminal truncation and hisâ-tag fusion. C-terminal truncation, which eliminates C-terminal 194-amino-acid residues from the intact mature α-amylase, raised the turnover number by 35% and increased the thermostability in terms of half-life at 65 °C by threefold. A hisâ-tag fusion at either the C- or N-terminus of truncated α-amylase further enhanced its turnover number by 59% and 37%, respectively. Molecular modeling revealed that these improvements could be attributed to structural rearrangement and reorientation of the catalytic residues.
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