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...

    Lotic community of algal species
    Lotic Communities & Algae

    Lotic communities have conditions that are rather harsh for typical plants. Thus, the diversity of plant species in loti..

    Principles of Hormonal Control Systems
    Principles of Hormonal Control Systems

    Hormones are essential in the regulation of the activity of the various biological systems of the human body. The ineffi..

    Birth Control and Contraception
    Birth Control and Contraception

    Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..

    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..

    Schematic diagram of bacterial lactose operon
    Gene Action – Operon Hypothesis

    Learn how the way genes control and determine every aspect of the body. This lesson uses lac operon as an example. ..

    ..

    Plant Auxins
    Plant Auxins – Phototropism & Geotropism

    Plants produce hormones to regulate their growth. Auxins, for instance, influence plant growth. Know the role of auxin i..

    Related Articles...

    No related articles found

    See all Related Topics