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Related Experiment Videos

Urease biogenesis in Streptococcus thermophilus.

Diego Mora1, Christophe Monnet, Carlo Parini

  • 1Dipartimento di Scienze e Tecnologie Alimentari e Microbiologiche, Università degli Studi di Milano, via Celoria 2, 20133 Milan, Italy. diego.mora@unimi.it

Research in Microbiology
|July 19, 2005
PubMed
Summary

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Urease production in Streptococcus thermophilus is highest during the late exponential growth phase. Its gene expression is regulated differently than in S. salivarius, especially at neutral pH.

Area of Science:

  • Microbiology
  • Enzymology
  • Bacterial Physiology

Background:

  • Urease is a crucial enzyme for bacteria, particularly in environments with fluctuating pH.
  • Streptococcus thermophilus, a key lactic acid bacterium in dairy fermentations, possesses urease activity.
  • Understanding urease biogenesis and regulation in S. thermophilus is important for its industrial applications and survival in diverse habitats.

Purpose of the Study:

  • To investigate the biogenesis and regulation of urease in Streptococcus thermophilus throughout its growth cycle.
  • To compare the urease gene expression patterns of S. thermophilus with those of the related species S. salivarius.

Main Methods:

  • In-gel urease detection and phenol-hypochloride assay for enzyme activity.
  • Zymogram analysis on non-denaturing polyacrylamide gels.

Related Experiment Videos

  • Transcriptional fusion analysis using beta-glucuronidase (GUS) reporter assays with a putative urease promoter (p(ureI)-gusA).

    • Main Results:

    • Urease synthesis begins in the mid-exponential phase, peaking in the late exponential phase.
    • Enzyme activity is significantly higher at acidic pH and less influenced by urea or nickel ions.
    • Reporter gene expression is substantial at neutral pH and increases in acidic conditions, independent of carbohydrates, nickel, or urea.

    Conclusions:

    • Urease gene transcription in S. thermophilus is regulated differently compared to S. salivarius, notably showing consistent expression at neutral pH.
    • These regulatory differences likely reflect adaptations to distinct ecological niches occupied by the two species.