Dictionary > Streptolysin S

Streptolysin S

Definition
noun
A nonantigenic, oxygenstable β-hemolytic enzyme produced by some bacteria, especially streptococci
Supplement
Streptolysin is a type of hemolysin produced by or derived from some strains of streptococci. It is a hemolytic exotoxin.
A streptolysin may be streptolysin O or streptolysin S. In 1930s, E. W. Todd was able to identify these two toxins responsible for the ability of group A streptococcus to lyse the erythrocytes of mammals. 1 Streptolysin O is oxygen-labile whereas streptolysin S is oxygen-stable.2 This means that streptolysin S is stable in the presence of atmospheric oxygen. In blood agar, the streptolysin S forms a zone of β hemolysis around the colonies of streptococci grown under routine aerobic conditions. This compound is toxic to leucocytes, platelets and many cell lines.
Compared with streptolysin O that is antigenic, the streptolysin S is not because of its relatively small size.
Abbreviation/Acronym:

  • SLS

Compare:

  • streptolysin O
  • See also:

    Reference(s):

    1 Wessels, M. R. (2005). Streptolysin S. The Journal of Infectious Diseases, 192 (1): 13–15. https://doi.org/10.1086/430625

    2Sierig, G., Cywes, C., Wessels, M. R., & Ashbaugh, C. D. (2003). “Cytotoxic effects of streptolysin o and streptolysin s enhance the virulence of poorly encapsulated group a streptococci”. Infect. Immun. 71 (1): 446–55


    You will also like...

    Still freshwater and plants
    Still Freshwater & Plants

    Plants in lentic habitats have features not found in terrestrial plants. They acquired these features as they adapt to t..

    Adaptive Radiation
    Adaptive Radiation

    The diversification of several new species from a recent ancestral source, each adapted to utilize or occupy a vacant ad..

    Ecological Research Measuring & Analysis
    Ecological Research: Measuring & Analysis

    This lesson is about the methods used for ecological research, such as quadrat and transect sampling, canopy fogging, an..

    Salmon jumping upstream in the river
    Lotic Communities & Animals

    A running water environment offers numerous microhabitats for many types of animals. Similar to plants, animals in lotic..

    Oligodendrocyte and Schwann cell
    The Central Nervous System

    Myelin sheath is essential for a faster conductivity of signals. Know more about this feature of some neurons in the Cen..

    bryophyte - sporophyte and gametophyte
    Meiosis and Alternation of Generations

    Plants are characterized by having alternation of generations in their life cycles. This tutorial is a review of plant m..

    Related Articles...

    No related articles found

    See all Related Topics