Document Detail

Unravelling the multiple effects of lactic acid stress on Lactobacillus plantarum by transcription profiling.
MedLine Citation:
PMID:  16339934     Owner:  NLM     Status:  MEDLINE    
The organic acid lactate is the predominant fermentation product of Lactobacillus plantarum. The undissociated form of this organic acid is a strong growth inhibitor for the organism. Different theories have been postulated to explain the inhibitory effects of lactic acid: (i) toxicity arising from the dissipation of the membrane potential, (ii) acidification of the cytosol, or (iii) intracellular anion accumulation. In general, organic acid stresses are complex to study, since their toxicity is highly dependent on their degree of dissociation and thus on the pH. In this study, transcription profiles of L. plantarum grown in steady-state cultures that varied in lactate/lactic acid concentration, pH, osmolarity and absolute and relative growth rate, were compared by microarray analysis. By doing so, the differential expression of multiple groups of genes could specifically be attributed to the different aspects of lactic acid stress. A highly coherent group of lactic acid-responsive, cell surface protein-encoding genes was identified, to which no function has previously been assigned. Moreover, a group of genes that showed increased expression in response to the combination of lactic acid and a lower growth rate is expected to be involved in the formation of the alternative fermentation end-products malate, acetate and ethanol. One of these pathways is the phosphoketolase by-pass that is typical for bifidobacteria.
Bart Pieterse; Rob J Leer; Frank H J Schuren; Mari?t J van der Werf
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Microbiology (Reading, England)     Volume:  151     ISSN:  1350-0872     ISO Abbreviation:  Microbiology (Reading, Engl.)     Publication Date:  2005 Dec 
Date Detail:
Created Date:  2005-12-12     Completed Date:  2006-02-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9430468     Medline TA:  Microbiology     Country:  England    
Other Details:
Languages:  eng     Pagination:  3881-94     Citation Subset:  IM    
Wageningen Centre for Food Sciences, Diedenweg 20, 6700 AN, Wageningen, The Netherlands.
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MeSH Terms
Gene Expression Profiling*
Gene Expression Regulation, Bacterial*
Genes, Bacterial
Hydrogen-Ion Concentration
Lactic Acid / metabolism,  pharmacology*
Lactobacillus plantarum / drug effects*,  genetics,  metabolism
Transcription, Genetic
Reg. No./Substance:
50-21-5/Lactic Acid

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