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 327270
Title Survival strategies of Listeria monocytogenes - roles of regulators and transporters
Author(s) Wemekamp-Kamphuis, H.H.
Source Wageningen University. Promotor(en): Frans Rombouts, co-promotor(en): Tjakko Abee; J.A. Wouters. - [S.l.] : S.n. - ISBN 9789058089335 - 152
Department(s) Food Microbiology
Publication type Dissertation, internally prepared
Publication year 2003
Keyword(s) listeria monocytogenes - voedselbewaring - koudeshock - bacteriële eiwitten - osmoregulatie - genetische regulatie - celmembranen - eiwittransport - listeria monocytogenes - food preservation - cold shock - bacterial proteins - osmoregulation - genetic regulation - cell membranes - protein transport
Categories Food Microbiology
Abstract Outbreaks of the food-borne pathogen Listeria monocytogenes are mainly associated with ready-to-eatfoods. Survival strategies of L. monocytogenes in relation to minimally processed foods were studied.

L.monocytogenespossesses several mechanisms to regulate transcription, e.g. the cold-shock proteins and the alternative sigma factorsB. Studies showed thatsBplays a crucial role in survival and adaptation to acidic conditions, HHP treatment and freezing by inducing the transcription of several genes.

To survive adverse conditions, L. monocytogenes accumulates solutes such as theosmolytesbetaine and carnitine, and (proline-containing) peptides. The transportersBetL,GbuandOpuCmediate betaine and carnitine uptake in the cell, ensuring low-temperature and high-osmolarity growth.OpuB, a fourthtransporter, is not involved in betaine or carnitine accumulation. Strains carrying anopuC oropuBdeletion were impaired in their ability to cause infection in mice.

Understanding the growth and survival of L. monocytogenes and knowledge of virulence factors will contribute to adequate food-safety measures.



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