Abstract
Expression and stability of the cloned Bacillus subtilis alkaline protease ( aprE)gene was monitored throughout the growth of free and alginate-immobilized B. subtilis cells. The time as well as the level of expression of the aprE gene in alginate-immobilized cells was found to be close to that of free cells. The multicopy plasmid that carries the aprE gene was stably maintained in alginate-immobilized cells. Plasmid stability was greatly enhanced, it reached 83% and 8% after ten growth cycles for alginate-immobilized and free cells in the absence of stress, respectively. Data presented demonstrate that immobilization of B. subtilis recombinant cells would partially solve the problem of plasmid instability in B. subtilis.
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