Abstract
In this study, a tyrosine decarboxylase gene (tdcA) was identified in 1 among 83 Streptococcus thermophilus strains tested. Its sequence, nearly identical to that of a tdcA of Lactobacillus curvatus, indicated a horizontal gene transfer event. Transcription in milk and the formation of critical levels of tyramine were observed in the presence of tyrosine.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Bacterial Proteins / genetics
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Bacterial Proteins / metabolism
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Cheese / microbiology
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Dairying
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Milk / chemistry*
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Milk / metabolism
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Molecular Sequence Data
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Reverse Transcriptase Polymerase Chain Reaction
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Sequence Analysis, DNA
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Streptococcus thermophilus / enzymology*
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Streptococcus thermophilus / genetics
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Streptococcus thermophilus / metabolism
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Tyramine / biosynthesis*
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Tyrosine Decarboxylase / genetics*
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Tyrosine Decarboxylase / metabolism*
Substances
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Bacterial Proteins
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Tyrosine Decarboxylase
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Tyramine