When the Bacillus brevis secretory metalloprotease is expressed from the npr gene on a plasmid vector in the mesophile B. subtilis, grown at 37°C, the enzyme was found to be properly processed, but secreted into the culture medium in a low‐active conformation. Secreted metalloprotease can by heat‐treatment (70°C for 30 min) be converted into fully active enzyme.
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