Is diphtheria an AB exotoxin?

Is diphtheria an AB exotoxin?

Examples of A-B toxins include: Diphtheria exotoxin, produced by Corynebacterium diphtheriae (inf). This toxin interferes with host cell protein synthesis by catalyzing the ADP-ribosylation of host cell elongation factor 2 (EF-2), necessary in order for tRNA to insert new amino acids into the growing protein chain.

Does Corynebacterium diphtheriae produce toxin?

Diphtheria toxin (DT) is one of the most extensively studied bacterial toxins with intracellular action. It is produced by toxigenic strains of Corynebacterium diphtheriae and is responsible for the symptoms of diphtheria.

What is the toxin that causes diphtheria?

Diphtheria is a serious infection caused by strains of bacteria called Corynebacterium diphtheriae that make a toxin (poison). It is the toxin that can cause people to get very sick. Diphtheria bacteria spread from person to person, usually through respiratory droplets, like from coughing or sneezing.

What are examples of exotoxins?

Well-known exotoxins include: botulinum toxin produced by Clostridium botulinum; Corynebacterium diphtheriae toxin, produced during life-threatening symptoms of diphtheria; tetanospasmin produced by Clostridium tetani….

• enterotoxin.
• neurotoxin.
• hemotoxin.
• cardiotoxin.
• phototoxin.

Which of the following is an example of an exotoxin?

(Science: protein) toxin released from gram-positive and gram-negative bacteria as opposed to endotoxins that form part of the cell wall. Examples are cholera, pertussis and diphtheria toxins. Usually specific and highly toxic.

How is pharyngeal diphtheria spread?

Diphtheria spreads from person to person, usually through respiratory droplets, like from coughing or sneezing. It can also spread by touching open sores or ulcers of someone with a diphtheria skin infection.

What are the three types of exotoxins?

There are three main types of exotoxins:

• superantigens (Type I toxins);
• exotoxins that damage host cell membranes (Type II toxins); and.
• A-B toxins and other toxin that interfere with host cell function (Type III toxins).