Summary
The hemA gene of Escherichia coli K12 was cloned by complementation of a hemA mutant of this organism. Subcloning of the initial 6.0 kb HindIII fragment allowed the isolation of a 1.5 kb NheI-AvaI fragment which retained the ability to complement the hemA mutant. DNA sequencing by the dideoxy chain terminator method of Sanger showed the presence of an open reading frame (ORF) of 1254 nucleotides, which ends 6 nucleotides beyond the AvaI site. Primer extension experiments showed the existence of a putative transcription initiation site for the hemA gene, located at position 130. A possible promoter sequence was identified upstream from this transcription initiation site, and its functional activity was confirmed by the use of the pK01 promoter-probe vector. Protein synthesis in an in vitro coupled transcription-translation system showed a 46 kDa protein, which corresponds to the mol. wt. of the hemA protein, as deduced from the nucleotide sequence of the gene. No homology was found between the amino acid sequence of the hemA protein of E. coli K12 and known sequences of other Δ-aminolevulinic acid synthases (Δ-ALAS), suggesting that this protein is different from other Δ-ALAS enzymes.
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Communicated by D.Y. Thomas
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Drolet, M., Péloquin, L., Echelard, Y. et al. Isolation and nucleotide sequence of the hemA gene of Escherichia coli K12. Mol Gen Genet 216, 347–352 (1989). https://doi.org/10.1007/BF00334375
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DOI: https://doi.org/10.1007/BF00334375