Abstract:
AIMS:This study elucidates the mechanisms by which a nonbacteriocinogenic Carnobacterium piscicola inhibits growth of Listeria monocytogenes. METHODS AND RESULTS:Listeria monocytogenes was exposed to live cultures of a bacteriocin-negative variant of C. piscicola A9b in co-culture, in a diffusion chamber system, and to a cell-free supernatant. Suppression of maximum cell density (0-3.5 log units) of L. monocytogenes was proportional to initial levels of C. pisciola (10(3)-10(7) CFU ml(-1)). Cell-to-cell contact was not required to cause inhibition. The cell-free C. piscicola supernatant caused a decrease in L. monocytogenes maximum cell density, which was abolished by glucose addition but not by amino acid, vitamin or mineral addition. The fermentate also gave rise to a longer lag phase and a reduction in growth rate. These effects were independent of glucose and may have been caused by acetate production by C. piscicola. 2D gel-electrophoretic patterns of L. monocytogenes exposed to C. piscicola or to L. monocytogenes fermentate did not differ. Treatment with C. piscicola fermentate resulted in down-regulation (twofold) of genes involved in purine- or pyrimidine metabolism, and up-regulation (twofold) of genes from the regulon for vitamin B12 biosynthesis and propanediol and ethanolamine utilization. CONCLUSIONS:A nonbacteriocinogenic C. piscicola reduced growth of L. monocytogenes partly by glucose depletion. SIGNIFICANCE AND IMPACT OF THE STUDY:Understanding the mechanism of microbial interaction enhances prediction of growth in mixed communities as well as use of bioprotective principles for food preservation.
journal_name
J Appl Microbioljournal_title
Journal of applied microbiologyauthors
Nilsson L,Hansen TB,Garrido P,Buchrieser C,Glaser P,Knøchel S,Gram L,Gravesen Adoi
10.1111/j.1365-2672.2004.02438.xsubject
Has Abstractpub_date
2005-01-01 00:00:00pages
172-83issue
1eissn
1364-5072issn
1365-2672pii
JAM2438journal_volume
98pub_type
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