Streptococcus downei

Bacteria
General | Carbohydrate O/F | Substrate utilisation | Enzymes | Metabolites | Antibiotics

Overview

  • Streptococcus downei is a Gram-positive, non-spore-forming, facultatively anaerobic, non-motile, coccus bacterium. It has been detected in at least 3 gut microbiome compilation studies or metastudies. The DNA G+C content is 41-42%. Streptococcus downei is probably a rare gut coloniser. (Whiley1988a)



  • This organism has been recovered from dental plaque of monkeys. The risk classification (www.baua.de) for this organism is 1, i.e., low risk of infection and spread. Pathogenicity status unknown, or very unlikely to be pathogenic. A possible gut commensal.
    • GENERAL CHARACTERISTICS (Whiley1988a);
    Character Response
  • 🧂
  • Salt tolerance:
  • doesn't tolerate 6.5% salt;
  • 💧
  • Bile tolerance:
  • Strain-variable at 40%
  • pH
  • Acidity tolerance:
  • doesn't tolerate pH 9.6;
  • 🌡
  • Temperature tolerance:
  • doesn't grow at 45℃;
  • H+
  • Acid from carbohydrates usually produced:
  • fructose; galactose; glucose; mannose; inulin; lactose; maltose; sucrose; trehalose; mannitol; salicin;
    • SPECIAL FEATURES (Whiley1988a);
    Character Response
  • ✓
  • Metabolites produced:
  • lactate;
  • ✗
  • Metabolites not produced:
  • indole;
  • ✓
  • VP test:
  • active
  • ✗
  • Nitrate:
  • not reduced

    • Details

    GENERAL
    Lineage Physiology General Growth Tolerances Hydrol./digest./degr.
    Phylum:  Firmicutes Class:  Bacilli Order:  Lactobacillales Family:  Streptococcaceae Genus:  Streptococcus Gram stain:  + O2 Relation.:  facultatively anaerobic Spore:  No spore Motility:  Sessile Morphology:  Coccus
    Health:  Unknown
    Source:  dental plaque of monkeys
    DNA G+C(%):  41-42
    High T(℃):  45(neg)
    NaCl >6%:  6.5(neg)
    pH >8:  9.6(neg)
    Bile reaction(%):  40(d)
    		Aesculin:  neg Starch:  neg Arginine:  neg Hippurate:  neg
    CARBOHYDRATE ACID FORMATION
    Monosaccharide O/F Oligosaccharide O/F Polysaccharide O/F Polyol O/F Other O/F
    Arabinose:  neg Fructose:  + Galactose:  + Glucose:  + Mannose:  + Cellubiose:  neg Lactose:  + Maltose:  + Melezitose:  neg Melibiose:  neg Sucrose:  + Trehalose:  + Glycogen:  neg Inulin:  + Starch:  neg Adonitol:  neg Glycerol:  neg Inositol:  neg Mannitol:  + Sorbitol:  neg Xylitol:  neg Salicin:  +
    ENZYME ACTIVITY
    Enzymes: General Enzymes: Carbohydrate Enzymes: Protein Enzymes: Arylamidases Enzymes: Esters/fats
    Catalase:  neg
    METABOLITES - PRODUCTION & USE
    Fuel Usable Metabolites Metabolites Released Special Products Compounds Produced

    		Lactate:  + Indole:  neg

    References

    SPECIFIC REFERENCES FOR STREPTOCOCCUS DOWNEI
  • Whiley1988a - Streptococcus downei sp. nov. for Strains Previously Described as Streptococcus mutans Serotype h
  • ...............................
    • GUT MICROBIOME COMPILATIONS AND METASTUDIES FOR STREPTOCOCCUS DOWNEI
  • Yang2020 - Species-Level Analysis of Human Gut Microbiota With Metataxonomics.
  • Yang2020a - Establishing high-accuracy biomarkers for colorectal cancer by comparing fecal microbiomes in patients with healthy families
  • Zeller2014 - Potential of fecal microbiota for early-stage detection of colorectal cancer
  • ...............................
    • Added: February 09, 2022