Cited by 105Bacterial Genetics and BiotechnologyProbiotics and Fermented FoodsMicrobial metabolism and enzyme function

Impact of Aeration and Heme-Activated Respiration on Lactococcus lactis Gene Expression: Identification of a Heme-Responsive Operon

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Pedersen, Martin Bastian, Garrigues, Christel, Tuphile, Karine, Brun, Célia, Vido, Karin, Bennedsen, Mads, Møllgaard, Henrik, Gaudu, Philippe +1 more·2008·Journal of Bacteriology

Abstract

Lactococcus lactis is a widely used food bacterium mainly characterized for its fermentation metabolism. However, this species undergoes a metabolic shift to respiration when heme is added to an aerobic medium. Respiration results in markedly improved biomass and survival compared to fermentation. Whole-genome microarrays were used to assess changes in L. lactis expression under aerobic and respiratory conditions compared to static growth, i.e., nonaerated. We observed the following. (i) Stress response genes were affected mainly by aerobic fermentation. This result underscores the differences between aerobic fermentation and respiration environments and confirms that respiration growth alleviates oxidative stress. (ii) Functions essential for respiratory metabolism, e.g., genes encoding cytochrome bd oxidase, menaquinone biosynthesis, and heme uptake, are similarly expressed under the three conditions. This indicates that cells are prepared for respiration once O(2) and heme become available. (iii) Expression of only 11 genes distinguishes respiration from both aerobic and static fermentation cultures. Among them, the genes comprising the putative ygfCBA operon are strongly induced by heme regardless of respiration, thus identifying the first heme-responsive operon in lactococci. We give experimental evidence that the ygfCBA genes are involved in heme homeostasis.

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Crossref · 10.1128/jb.00447-08

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  • Orthologous HrtAB systems occur in several Gram-positive species, indicating that alleviating heme toxicity is a common challenge for many Gram-positive bacteria.

    “Orthologous HrtAB systems have been identified in a number of species including L. monocytogenes, Bacillus thuringiensis,Bacillus cereus, Lactococcus lactis, Streptococcus agalactiae and S. epidermidis indicating that alleviation of heme toxicity is a common obstacle faced by many Gram positive bacteria [63, 66–67].”

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Authors
Pedersen, M. B., Garrigues, C., Tuphile, K., Brun, C., Vido, K., Bennedsen, M., Møllgaard, H., Gaudu, P., & Gruss, A.
Affiliations
  • Department of Physiology
  • Institut National de la Recherche Agronomique (FR)
  • Unité Bactéries Lactiques et Pathogènes Opportunistes, INRA UR888, Jouy en Josas, 78352, France
  • Chr. Hansen (Denmark) (DK)
  • Department of Fermentation Technology
Corresponding author
  • Pedersen, Martin Bastian
  • Gruss, Alexandra
Venue
Journal of Bacteriology
Published
2008-07-15
Volume
190
Issue
14
Pages
4903-4911
ISSN
  • 0021-9193 (ISSN-L)
  • 1098-5530
OpenAlex
W2143240949
Cited by
103
References
58
Citations by year
2026: 3 · 2025: 3 · 2024: 2 · 2023: 2 · 2022: 4 · 2021: 3 · 2020: 3 · 2019: 7 · 2018: 6 · 2017: 5 · 2016: 8 · 2015: 9 · 2014: 6 · 2013: 8 · 2012: 9
FWCI
4.75
Type
journal article
Language
en
Open access
Locations
  • Journal of Bacteriology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Life Sciences › Agricultural and Biological Sciences › Food Science › Probiotics and Fermented Foods
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial metabolism and enzyme function
Keywords
Lactococcus lactis, aeration, gene expression, heme homeostasis, aerobic fermentation, oxidative stress response, cytochrome bd oxidase, menaquinone biosynthesis, heme uptake
MeSH terms
Aerobiosis, beta-Galactosidase, Fermentation, Gene Expression Regulation, Genes, Bacterial, Heme, Operon, RNA, Bacterial, Lactococcus lactis, Blotting, Northern, Genes, Reporter, Oxidative Stress, Artificial Gene Fusion, Reverse Transcriptase Polymerase Chain Reaction, Oligonucleotide Array Sequence Analysis, Gene Expression Profiling

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