期刊
INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
卷 126, 期 1-2, 页码 202-209出版社
ELSEVIER
DOI: 10.1016/j.ijfoodmicro.2008.05.025
关键词
fish sauce; halophilic lactic acid bacteria; histamine; histidine decarboxylase; plasmid; Tetragenococcus halophilus
In order to analyze the genes related to the histamine production. a strain of histamine producing halophilic bacteria, referred to as strain H, was isolated using enrichment culture and dilution-to-extinction methods with histidine broth inoculated from the fish sauce mashes. The two Japanese fish sauce mashes used, accumulate over 1000 mg/l of histamine. Phenotypic and 16 S rRNA gene sequence analyses identified strain H as Tetragenococcus halophilus, the predominant histamine producing bacteria present during fish sauce fermentation. Genetic analyses (PCR and Southern blot) of the histamine producing strain confirmed that the Strain harbored a 30 kbp plasmid (pHDC) encoding a single copy of the pyruvoyl dependent histidine decarboxylase gene (hdc). A comparison of hdcA that is a structural gene of histidine decarboxylase among strain H, Lactobacillus hilgardii 0006, L sakei LTH2076, Oenococcus oeni 9204, T halophilus and T muriaticus JCM10006(T) indicated > 99% sequence similarity. The hdc gene cluster consisted of 4 ORFs, hdcP, hdcA, hdcB, and hdcRS, and were almost identical to that of L. hilgardii 0006 with 99% sequence similarity including the structural hdc spacer region. However, the approximately 500 bp regions upstream and downstream of the hdc gene were different between that of strain H and L. hilgardii 0006. The complete sequence of pHDC revealed 29,924 nucleotides including 28 ORFs, two pairs of IR (inverted repeat), similar sequence of plasmid conjugative elements, and a theta-type replicon. These results suggested that hdc could be encoded on transformable elements among lactic acid bacteria. (C) 2008 Elsevier B.V. All rights reserved.
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