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. 1993 Jan;59(1):347–350. doi: 10.1128/aem.59.1.347-350.1993

Cloning and characterization of the gene encoding glutamate 1-semialdehyde 2,1-aminomutase, which is involved in delta-aminolevulinic acid synthesis in Propionibacterium freudenreichii.

K Murakami 1, Y Hashimoto 1, Y Murooka 1
PMCID: PMC202104  PMID: 8439165

Abstract

The gene from Propionibacterium freudenreichii that encodes glutamate 1-semialdehyde 2,1-aminomutase (EC 5.4.3.8), which is involved in the C5 pathway for synthesis of delta-aminolevulinic acid (ALA), a precursor in heme and cobalamin biosynthesis, was cloned onto a multicopy plasmid, pUC18, via complementation of an ALA-deficient mutant (hemL) of Escherichia coli. Subcloning of fragments from the initial 3.3-kb chromosomal fragment allowed the isolation of a 1.9-kb fragment which could complement the hemL mutation. Nucleotide sequence analysis of the 1.9-kb DNA fragment revealed an open reading frame (ORF) that was located downstream from a potential ribosome-binding site. The ORF encoded a polypeptide of 441 amino acid residues, and the deduced molecular mass of this polypeptide is 45,932 Da. A high G+C content (70 mol%) of the codons of the ORF was found and was consistent with the taxonomic features of Propionibacterium species. The amino acid sequence showed a high degree of homology with those of the HemL proteins from other organisms, and a putative binding site for pyridoxal 5'-phosphate was conserved, with the exception of a single substitution of phenylalanine for leucine. These results suggest that ALA is synthesized via the C5 pathway in a producer of vitamin B12, P. freudenreichii.

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Selected References

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