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Identification of the Enterococcus faecalis Tyrosine Decarboxylase Operon Involved in Tyramine Production
Abstract
Screening of a library of Enterococcus faecalis insertional mutants allowed isolation of a mutant affected in tyramine production. The growth of this mutant was similar to that of the wild-type E. faecalis JH2-2 strain in Maijala broth, whereas high-performance liquid chromatography analyses showed that tyramine production, which reached 1,000 μg ml −1 for the wild-type strain, was completely abolished. Genetic analysis of the insertion locus revealed a gene encoding a decarboxylase with similarity to eukaryotic tyrosine decarboxylases. Sequence analysis revealed a pyridoxal phosphate binding site, indicating that this enzyme belongs to the family of amino acid decarboxylases using this cofactor. Reverse transcription-PCR analyses demonstrated that the gene ( tdc ) encoding the putative tyrosine decarboxylase of E. faecalis JH2-2 is cotranscribed with the downstream gene encoding a putative tyrosine-tyramine antiporter and with the upstream tyrosyl-tRNA synthetase gene. This study is the first description of a tyrosine decarboxylase gene in prokaryotes.
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Metadata
- Authors
- Connil, N., Le Breton, Y., Dousset, X., Auffray, Y., Rincé, A., & Prévost, H.
- Venue
- Applied and Environmental Microbiology
- Publisher
- American Society for Microbiology
- Published
- 2002-07
- Volume
- 68
- Issue
- 7
- Pages
- 3537-3544
- ISSN
- 0099-2240
- 1098-5336
- Cited by
- 130
- References
- 3
- Language
- en
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- Connil, N., Le Breton, Y., Dousset, X., Auffray, Y., Rincé, A., & Prévost, H. (2002). Identification of the Enterococcus faecalis Tyrosine Decarboxylase Operon Involved in Tyramine Production. Applied and Environmental Microbiology. https://doi.org/10.1128/aem.68.7.3537-3544.2002
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