Hemolysin

Definition

Hemolysin is a type of toxin produced by certain bacteria that can destroy red blood cells by disrupting their cell membrane. This action releases hemoglobin and can contribute to the pathogenicity of the bacterium.

5 Must Know Facts For Your Next Test

1. Hemolysins are typically classified as exotoxins and play a crucial role in bacterial virulence.
2. They are often produced by pathogens such as Streptococcus, Staphylococcus, and Escherichia coli.
3. Hemolytic activity can be assessed using blood agar plates, where clear zones around colonies indicate red blood cell lysis.
4. In gastrointestinal infections, hemolysins can contribute to tissue damage and inflammation.
5. Some hemolysins function by forming pores in the host cell membranes, leading to cell lysis.

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Related terms

Exotoxin: A toxin released by a living bacterial cell into its surroundings.

Virulence Factor: A molecule or structure that enhances the ability of a microbe to cause disease.

Blood Agar Plate: A nutrient-rich medium used to culture bacteria and detect hemolytic activity.