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Characterization of a second ornithine decarboxylase isolated from Morganella morganii

Characterization of a second ornithine decarboxylase isolated from Morganella morganii

Journal of Food Protection 71(3): 657-661

ISSN/ISBN: 0362-028X

PMID: 18389719

DOI: 10.4315/0362-028x-71.3.657

The genes involved in the putrescine formation by Morganella morganii were investigated because putrescine is an indicator of food process deterioration. We report here on the existence of a new gene for ornithine decarboxylase (ODC) in M. morganii. The sequenced 5,311-bp DNA region showed the presence of four complete and one partial open reading frame. Putative functions have been assigned to several gene products by sequence comparison with the proteins included in the databases. The third open reading frame (speC) encoded a 722-amino acid protein showing 70.9% identity to the M. morganii ODC previously characterized (SpeF). The speC gene has been expressed in Escherichia coli, resulting in ODC activity. The presence of a functional promoter (PspeC) located upstream of speC has been demonstrated. Quantitative real-time reverse transcription PCR assay was used to quantify expression of both M. morganii ODC-encoding genes, speC and speF, under different growth conditions. This assay allows us to identify SpeF as the inducible M. morganii ODC, since it was highly expressed in the presence of ornithine.

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Accession: 020710781

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