Cloning of dapD, aroD and asd of Leptospira interrogans serovar icterohaemorrhagiae, and nucleotide sequence of the asd gene.
Metabolites such as diaminopimelate and some aromatic derivatives, not synthesized in mammalian cells, are essential for growth of bacteria. As a first step towards the design of a new human live vaccine that uses attenuated strains of Leptospira interrogans, the asd, aroD and dapD genes, encoding aspartate beta-semialdehyde dehydrogenase, 3-dehydroquinase and tetrahydrodipicolinate N-succinyltransferase, respectively, were cloned by complementation of Escherichia coli mutants. The complete nucleotide sequence of the asd gene was determined and found to contain an open reading frame capable of encoding a protein of 349 amino acids with a calculated Mr of 38,007. Comparison of this deduced L. interrogans aspartate beta-semialdehyde dehydrogenase amino acid sequence with those of the same enzyme from Saccharomyces cerevisiae and Corynebacterium glutamicum revealed 46% and 36% identity, respectively. By contrast, the identity between the L. interrogans enzyme and the Streptococcus mutans or E. coli enzymes was less than 31%. Highly conserved sequences within aspartate semialdehyde dehydrogenase from the five organisms were observed at the amino and carboxyl termini, and around the cysteine of the active site.
Unité de Bactériologie Moléculaire et Médicale, Institut Pasteur, Paris, France.
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Baril
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Richaud
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Fournié
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Baranton
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Saint Girons
D000217:Acyltransferases / Q000235:genetics*; D000595:Amino Acid Sequence; D001223:Aspartate-Semialdehyde Dehydrogenase / Q000096:biosynthesis / Q000235:genetics*; D001483:Base Sequence; D003001:Cloning, Molecular; D003352:Corynebacterium / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics; D005798:Genes, Bacterial; D005816:Genetic Complementation Test; D006836:Hydro-Lyases / Q000235:genetics*; D007921:Leptospira interrogans / Q000201:enzymology / Q000235:genetics*; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D012441:Saccharomyces cerevisiae / Q000235:genetics; D012689:Sequence Homology, Nucleic Acid; D013295:Streptococcus mutans / Q000235:genetics
D001223:Aspartate-Semialdehyde Dehydrogenase; D000217:Acyltransferases; C040777:succinyl-CoA-tetrahydrodipicolinate N-succinyltransferase; D006836:Hydro-Lyases; C020000:3-dehydroquinate dehydratase