Unexpected influence of a C-terminal-fused His-tag on the processing of an enzyme and on the kinetic and folding parameters
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文摘
The addition of a poly-His C-terminal extension, designed to facilitate the purification of the protein, to the β-lactamase of a thermophilic Bacillus licheniformis strain modified the site of action of the signal peptidase. This resulted in the secretion of a protein with a different N-terminus, showing that this type of protein engineering might not always be as `neutral' as generally assumed.