Abstract
The Bacillus subtilis homolog of the Escherichia coli ftsZ gene was isolated by screening a B. subtilis genomic library with anti-E. coli FtsZ antiserum. DNA sequence analysis of a 4-kilobase region revealed three open reading frames. One of these coded for a protein that was about 50% homologous to the E. coli FtsZ protein. The open reading frame just upstream of ftsZ coded for a protein that was 34% homologous to the E. coli FtsA protein. The open reading frames flanking these two B. subtilis genes showed no relationship to those found in E. coli. Expression of the B. subtilis ftsZ and ftsA genes in E. coli was lethal, since neither of these genes could be cloned on plasmid vectors unless promoter sequences were first removed. Cloning the B. subtilis ftsZ gene under the control of the lac promoter resulted in an IPTGs phenotype that could be suppressed by overproduction of E. coli FtsZ. These genes mapped at 135 degrees on the B. subtilis genetic map near previously identified cell division mutations.
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