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The alkaline protease gene, apr, from Bacillus licheniformis 2709 was cloned into a Bacillus shuttle expression vector, pHL, to yield the recombinant plasmid pHL-apr. The pHL-apr was expressed in Bacillus subtilis WB600, yielding a high expression strain BW-016. The amount of alkaline protease produced in the recombinant increased by 65% relative to the original strain. SDS-PAGE analysis indicated...
An extracellular alkaline protease produced by Bacillus licheniformis AP-1 was purified 76-fold, yielding a single 28 kDa band on SDS-PAGE. It was optimally active at pH 11 and at 60°C (assayed over 10 min). The protease was completely inhibited by phenylmethylsulfonyl fluoride and diodopropyl fluorophosphate, with little increase upon Ca2+ and Mg2+ addition.
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