Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 342283
Title Identification and characterization of di- and tripeptide transporter DtpT of Listeria monocytogenes EGD-e
Author(s) Wouters, J.A.; Hain, T.; Darji, A.; Hüfner, E.; Wemekamp-Kamphuis, H.H.; Chakraborty, T.; Abee, T.
Source Applied and Environmental Microbiology 71 (2005)10. - ISSN 0099-2240 - p. 5771 - 5778.
DOI https://doi.org/10.1128/AEM.71.10.5771-5778.2005
Department(s) Food Microbiology Laboratory
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2005
Keyword(s) lactococcus-lactis - salt tolerance - minimal medium - peptide transporter - high osmolarity - growth - virulence - system - genes - protein
Abstract Listeria monocytogenes is a gram-positive intracellular pathogen responsible for opportunistic infections in humans and animals. Here we identified and characterized the dtpT gene (lmo0555) of L. monocytogenes EGD-e, encoding the di- and tripeptide transporter, and assessed its role in growth under various environmental conditions as well as in the virulence of L. monocytogenes. Uptake of the dipeptide Pro-[14C]Ala was mediated by the DtpT transporter and was abrogated in a dtpT isogenic deletion mutant. The DtpT transporter was shown to be required for growth when the essential amino acids leucine and valine were supplied as peptides. The protective effect of glycine- and proline-containing peptides during growth in defined medium containing 3% NaCl was noted only in L. monocytogenes EGD-e, not in the dtpT mutant strain, indicating that the DtpT transporter is involved in salt stress protection. Infection studies showed that DtpT contributes to pathogenesis in a mouse infection model but has no role in bacterial growth following infection of J774 macrophages. These studies reveal that DptT may contribute to the virulence of L. monocytogenes
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