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Isolation and characterization of a recombinant plasmid carrying a functional part of the Bacillus subtilis spoIIA locus.

Plasmid pHM2 consists of a 3.3 kb insert of Bacillus subtilis DNA in the chimeric plasmid pHV33, and can replicate in Escherichia coli and B. subtilis. In B. subtilis, pHM2 complements the defects resulting from mutations spo-42, spo-50, spo-69 and sas-1 in the spoIIA locus. This complementation can occur in recE4 strains where recombination of the plasmid with the chromosome is prevented, and the chromosome retains the mutant allele. Thus the plasmid carries a functional part of the spoIIA locus; it does not contain the complete locus as it cannot complement several other spoIIA mutations. It is likely that the locus is complex, containing at least two genes.