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Related Experiment Videos

Lactococcus lactis and stress

F Rallu1, A Gruss, E Maguin

  • 1Institut National de la Recherche Agronomique Laboratoire de Génétique Microbienne, France.

Antonie Van Leeuwenhoek
|October 1, 1996
PubMed
Summary
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Lactic acid bacteria possess inducible acid stress responses. Adaptation to low pH requires protein synthesis and involves genes like ahrC and the stringent response pathway for survival.

Area of Science:

  • Microbiology
  • Bacterial Physiology
  • Stress Response Mechanisms

Background:

  • Cellular defense mechanisms are crucial for survival in suboptimal natural environments.
  • Lactic acid bacteria (LAB) face various stresses, including acidity generated during growth.
  • Understanding stress response regulation in LAB is vital for their industrial applications.

Purpose of the Study:

  • To investigate the acid stress response in Lactococcus lactis.
  • To identify regulatory genes involved in acid tolerance in L. lactis.
  • To explore the role of adaptation in acid stress survival.

Main Methods:

  • Adaptation experiments at different pH levels to assess survival rates.
  • Protein synthesis inhibition assays to confirm gene induction.

Related Experiment Videos

  • Transpositional mutagenesis to identify acid-resistant mutants.
  • Sequence homology analysis to identify interrupted genes.

    • Main Results:

    • Lactococcus lactis MG1363 demonstrates inducible acid tolerance, surviving pH 4.0 after brief adaptation (pH 4.5-6.5).
    • Adaptation requires de novo protein synthesis, indicating gene expression changes.
    • Mutant analysis identified ahrC (arginine metabolism regulator) and genes in the (p)ppGpp synthesis pathway as important for acid tolerance.

    Conclusions:

    • L. lactis exhibits an inducible acid stress response essential for survival.
    • The stringent response pathway, typically linked to starvation, appears to play a role in acid pH tolerance.
    • Identifying regulatory genes like ahrC offers insights into enhancing acid tolerance in LAB.