Bacterial stress response in Listeria monocytogenes: jumping the hurdles imposed by minimal processing

Hill, Colin; Cotter, Paul D.; Sleator, Roy D.; Gahan, Cormac G. M.

doi:10.1016/s0958-6946(01)00125-x

Cited by 167 publications

(115 citation statements)

References 110 publications

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“…Decontamination techniques must also take into account the very strong ability of microorganisms to adapt themselves rapidly to their enviroment. Thus, the microorganisms that suffered sub-lethal stress factor can develop new resistance mechanisms (Hill et al, 2002;Lou & Yousef, 1997;Rajkovic et al, 2009;Rowan, 1999). This evolution is usually not abrupt but more gradual.…”

Section: Generalitiesmentioning

confidence: 99%

Decontamination of Solid and Powder Foodstuffs using DIC Technology

Allaf¹,

Besombes²,

Mih³

et al. 2011

Advances in Computer Science and Engineering

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Section: Generalitiesmentioning

confidence: 99%

Decontamination of Solid and Powder Foodstuffs using DIC Technology

Allaf¹,

Besombes²,

Mih³

et al. 2011

Advances in Computer Science and Engineering

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“…They complicate efforts to elucidate relationships among stress tolerance mechanisms, bacterial virulence and the incidence of human or animal disease. The redundancy of bacterial osmoregulatory mechanisms was first defined via studies of E. coli K-12 and Salmonella enterica serovar Typhimurium (17), and even greater redundancy has since been shown for the gram-positive bacteria Bacillus subtilis (48), Corynebacterium glutamicum (57), and L. monocytogenes (44). E. coli K-12 can achieve osmotolerance through the accumulation and release of K ϩ or compatible solutes (88).…”

mentioning

confidence: 99%

Osmoregulatory Systems ofEscherichia coli:Identification of Betaine-Carnitine-Choline Transporter Family MemberBetU and Distributions ofbetUandtrkGamongPathogenic and NonpathogenicIsolates

Henderson

et al. 2004

J Bacteriol

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Multiple transporters mediate osmoregulatory solute accumulation in Escherichia coli K-12. The larger genomes of naturally occurring strains such as pyelonephritis isolates CFT073 and HU734 may encode additional osmoregulatory systems. CFT073 is more osmotolerant than HU734 in the absence of organic osmoprotectants, yet both strains grew in high osmolality medium at low K ؉ (micromolar concentrations) and retained locus trkH, which encodes an osmoregulatory K ؉ transporter. Both lacked the trkH homologue trkG. Transporters ProP and ProU account for all glycine-betaine uptake activity in E. coli K-12 and CFT073, but not in HU734, yet elimination of ProP and ProU impairs the growth of HU734, but not CFT073, in high osmolality human urine. No known osmoprotectant stimulated the growth of CFT073 in high osmolality minimal medium, but putative transporters YhjE, YiaMNO, and YehWXYZ may mediate uptake of additional osmoprotectants. Gene betU was isolated from HU734 by functional complementation and shown to encode a betaine uptake system that belongs to the betaine-choline-carnitine transporter family. The incidence of trkG and betU within the ECOR collection, representatives of the E. coli pathotypes (PATH), and additional strains associated with urinary tract infection (UTI) were determined. Gene trkG was present in 66% of the ECOR collection but only in 16% of the PATH and UTI collections. Gene betU was more frequently detected in ECOR groups B2 and D (50% of isolates) than in groups A, B1, and E (20%), but it was similar in overall incidence in the ECOR collection and in the combined UTI and PATH collections (32 and 34%, respectively). Genes trkG and betU may have been acquired by lateral gene transfer, since trkG is part of the rac prophage and betU is flanked by putative insertion sequences. Thus, BetU and TrkG contribute, with other systems, to the osmoregulatory capacity of the species E. coli, but they are not characteristic of a particular phylogenetic group or pathotype.

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“…0.90 (Nolan et al, 1992). Owing to its complex and versatile physiological adaptation mechanisms, L. monocytogenes can persist and often proliferate in contaminated foods under a wide range of antimicrobial conditions, such as low aw, low pH, and low temperature (Hill et al, 2002).…”

Section: Sdrp Journal Of Food Science and Technologymentioning

confidence: 99%

Listeria monocytogenes on cured meat products. A case study on Speck (a typical Italian smoked ham) according to EC Regulation 2073/2005

Barbuti¹,

Dalzini²,

Frustoli³

et al. 2017

SDRP-JFST

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ABSTRACT:Ready To Eat (RTE) meat products may be able to support the growth of Listeria monocytogenes during their shelf life. In agreement with the European Commission (EC) Regulation N. 2073/2005 on microbiological criteria for foodstuff, the products with pH ≤ 4.4 or aw ≤ 0.92, those with pH ≤ 5.0 and aw ≤ 0.94 and those with a shelf-life of less than five days are automatically included in the category of RTE foods that doesn't able to support the growth of L. monocytogenes. Otherwise, the manufacturers must demonstrate whether their products not allow the growth of L. monocytogenes by use of different approaches based on: i) physicalchemical analyses of product, ii) predictive microbiology and iii) Microbial Challenge Test (MCT), as suggested by EC Regulation 2073/2005. The present study evaluated the three above mentioned approaches on Speck, a traditional smoked dry cured ham produced in South Tyrol (Italy). Both the variability of the physical-chemical properties of Speck (aw ranging from 0.890 to 0.940 and pH from 5.37 to 6.24) and the use of prediction models did not allow to state whether the product supports the growth of the pathogen and a reliable classification of the product. On the contrary, the MCT carried out showed the L. monocytogenes inactivation during shelf life of sliced vacuum-packed or modified atmosphere-packed Speck stored at different temperatures 4°, 8° and 20°C.

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Bacterial stress response in Listeria monocytogenes: jumping the hurdles imposed by minimal processing

Cited by 167 publications

References 110 publications

Decontamination of Solid and Powder Foodstuffs using DIC Technology

Decontamination of Solid and Powder Foodstuffs using DIC Technology

Osmoregulatory Systems ofEscherichia coli:Identification of Betaine-Carnitine-Choline Transporter Family MemberBetU and Distributions ofbetUandtrkGamongPathogenic and NonpathogenicIsolates

Listeria monocytogenes on cured meat products. A case study on Speck (a typical Italian smoked ham) according to EC Regulation 2073/2005

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