Identification and Characterization of Di- and Tripeptide Transporter DtpT of Listeria Monocytogenes EGD-e

Overview

Journal Appl Environ Microbiol

Specialties Environmental Health
Microbiology

Date 2005 Oct 6

PMID 16204487

Citations 12

Authors

Jeroen A Wouters

Torsten Hain

Ajub Darji

Eric Hufner

Henrike Wemekamp-Kamphuis

Trinad Chakraborty

Tjakko Abee

Affiliations

Soon will be listed here.

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 DeltadtpT 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 DeltadtpT 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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