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Related Experiment Videos

Peptide utilization by group N streptococci.

B A Law

    Journal of General Microbiology
    |March 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Group N streptococci show varied peptide uptake. Some strains transport amino acids, dipeptides, and tripeptides distinctly, with similarities to Gram-negative bacteria.

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    Area of Science:

    • Microbiology
    • Bacterial Physiology
    • Molecular Biology

    Background:

    • Group N streptococci are important in dairy fermentation.
    • Understanding peptide transport is crucial for optimizing their metabolic functions.

    Purpose of the Study:

    • To investigate the uptake and utilization of peptides by Group N streptococci.
    • To determine the specificity and mechanisms of peptide transport in these bacteria.

    Main Methods:

    • Assessing glycylleucine uptake rates in various strains.
    • Analyzing the transport and utilization of amino acids, dipeptides, and tripeptides.
    • Comparing peptide transport mechanisms with those in Gram-negative bacteria.

    Main Results:

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  • Significant variation in glycylleucine uptake rates among strains.
  • One Streptococcus cremoris strain lacked dipeptide and tripeptide transport.
  • Distinct transport systems for amino acids, dipeptides, and tripeptides were observed.
  • Dipeptides were found to inhibit tripeptide utilization.
  • Peptide transport and utilization determinants resemble those in Gram-negative bacteria.
  • Peptide utilization in Streptococcus lactis was not solely dependent on intact peptide transport.

    • Conclusions:

    • Group N streptococci exhibit diverse peptide transport capabilities.
    • Mechanisms for peptide transport in these bacteria share similarities with Gram-negative species.
    • Further research is needed to fully elucidate the complex peptide metabolism in streptococci.