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The Zymomonas mobilis phoA gene, encoding a phosphate-irrepressible alkaline phosphatase (ZAPase), was cloned and its expression was studied in phoA mutants of Escherichia coli. The ZAPase was recovered in the soluble fraction of E. coli. The enzyme was synthesized constitutively and its synthesis not repressed by phosphate, unlike the phoA gene of E. coli. The phoA gene of Z. mobilis was mutagenized by Mini Mu PR13 and the mutated gene crossed into Z. mobilis in order to obtain phoA mutants by reverse genetics. Although Z. mobilis mutants with Mini Mu PR13 integrated in the chromosome were obtained, none had an allele replacement for none was defective in ZAPase.

Cloning and expression in Escherichia coli of a phoA gene encoding a phosphate-irrepressible alkaline phosphatase of Zymomonas mobilis