Elsevier

Plasmid

Volume 39, Issue 3, May 1998, Pages 235-244
Plasmid

Regular Article
Plasmid-Mediated Histamine Biosynthesis in the Bacterial Fish PathogenVibrio anguillarum

Communicated by S. A. Khan
https://doi.org/10.1006/plas.1998.1345Get rights and content

Abstract

Histamine production in bacteria-contaminated fish is the result of the presence of bacterial histidine decarboxylase activity, which converts histidine present in muscle proteins to histamine. The fish pathogenVibrio anguillarumharbors a plasmid-encoded histidine decarboxylase gene (angH) that is essential for biosynthesis of the siderophore anguibactin. However, the role ofangHin histamine biosynthesis by this pathogen has not been fully determined. Thus, the objectives of this study were to monitor the production and release of histamine by the wild-type as well as by a plasmidless strain andangHisogenic mutants generated by allelic exchange. Reverse transcription polymerase chain reaction showed that only the wild-type strain expressedangH,while noangHmessage was detected in the mutants and the plasmidless derivative. The iron uptake-deficient phenotype of one of theangHmutants confirmed the location of the mutation and the unique role of this gene in iron acquisition. Thin-layer chromatography, gas chromatography, and mass spectrometry showed that histamine was released by the strain harboring a wild-typeangHgene when grown in excess histidine. This biogenic amine was not detected in the culture supernatants of the plasmidless derivative and theangHmutant when cultured under the same experimental conditions. These results indicate thatangHis essential for histamine biosynthesis inV. anguillarum,a compound responsible for food poisoning and potentially involved in bacterial virulence. Thin-layer chromatography of wild-type culture supernatants and β-galactosidase assays using the isogenicangHmutant demonstrated that the expression of this gene is independent of the histidine concentration of the medium under both iron-rich and iron-limiting conditions.

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