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A leucine aminopeptidase gene of Aquifex aeolicus, a hyperthermophilic bacterium, was cloned and expressed in Escherichia coli, and its expression product was purified and characterized. The expressed protein was purified to homogeneity by using heat to denature contaminating proteins followed by ion-exchange chromatography to purify the heat-stable product. The purified enzyme gave a single band...
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