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Metabolic operons in Lactococci

P Renault1, J J Godon, N Goupil

  • 1Laboratoire de Génétique Microbienne, Institut National de la Recherche Agronomique, Jouy-en-Josas, France.

Developments in Biological Standardization
|January 1, 1995
PubMed
Summary
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New regulatory mechanisms control amino acid biosynthesis in Gram-positive bacteria. The orf3 gene regulates histidine operon expression via transcription attenuation, while aldB controls branched-chain amino acid flux through a metabolic shunt.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Amino acid biosynthesis genes are organized into operons in bacteria.
  • The histidine (his) and branched-chain amino acid (ilv) operons contain regulatory genes in addition to those encoding pathway enzymes.

Purpose of the Study:

  • To elucidate the regulatory functions of orf3 and aldB genes within the his and ilv operons, respectively.
  • To identify novel regulatory mechanisms controlling amino acid biosynthesis in Gram-positive bacteria.

Main Methods:

  • Bioinformatic analysis to identify homologous proteins.
  • Enzyme activity assays to determine the function of aldB.
  • Genetic manipulation to study transcriptional regulation of the his operon.

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Main Results:

  • The orf3 gene encodes a protein homologous to histidyl-tRNA synthetases and is involved in transcription attenuation of the his operon.
  • A novel attenuation mechanism controlling tRNA synthetase and metabolic operons in Gram-positive bacteria was identified.
  • The aldB gene encodes acetolactate decarboxylase, which converts acetolactate to acetoin.
  • AldB activity is positively regulated by leucine availability, representing a metabolic shunt.

Conclusions:

  • orf3 and aldB represent key regulatory elements in bacterial amino acid metabolism.
  • These findings reveal new classes of transcriptional attenuation and metabolic control mechanisms in Gram-positive bacteria.