Abstract
Polymerase chain reaction (PCR) primers designed from a multiple alignment of predicted amino acid sequences from bacterial aroA genes were used to amplify a fragment of Lactococcus lactis DNA. An 8 kb fragment was then cloned from a lambda library and the DNA sequence of a 4.4 kb region determined. This region was found to contain the genes tyrA, aroA, aroK, and pheA, which are involved in aromatic amino acid biosynthesis and folate metabolism. TyrA has been shown to be secreted and AroK also has a signal sequence, suggesting that these proteins have a secondary function, possibly in the transport of amino acids. The aroA gene from L. lactis has been shown to complement an E. coli mutant strain deficient in this gene. The arrangement of genes involved in aromatic amino acid biosynthesis in L. lactis appears to differ from that in other organisms.
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Communicated by H. Böhme
The nucleotide sequence data reported in this paper have been submitted to the EMBL, GenBank, and DDBJ Nucleotide Sequence Databanks and have been assigned the accession number X78413
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Griffin, H.G., Gasson, M.J. Genetic aspects of aromatic amino acid biosynthesis in Lactococcus lactic . Molec. Gen. Genet. 246, 119–127 (1995). https://doi.org/10.1007/BF00290140
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DOI: https://doi.org/10.1007/BF00290140