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Lecture 4

HMB202H1 Lecture Notes - Lecture 4: Endosome, Lysis, Cell Membrane


Department
Human Biology
Course Code
HMB202H1
Professor
Ron Wilson
Lecture
4

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Viral Replication of a Temperate Bacteriophage
Whenever the bacterium reproduces, the prophage is also copied.
Endotoxins
Endotoxins are only released when the bacteria cell dies or during cell division.
Exotoxins
In addition to being classified which type of cells they infect (neurotoxin, enterotoxin,
cytotoxin), they can also be classified based on their structure/function: A-B toxins, toxins that
disrupt membranes, and superantigens.
A-B toxins The B domain binds to a specific receptor (usually a carbohydrate) on the host cell.
The entire exotoxin is then brought inside through endocytosis. Once inside the endosome, the B
domain creates a pore in the endosome which allows the A domain to escape into the cytoplasm
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