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Contents

Background

Botulinum Toxin (BTX) is produced by three species of obligate anaerobe bacterium, primarily Clostridium botulism, but Clostridium baratii and Clostridium butyricum also produce the protein [1] [2] [3]. Clostridium botulism is commonly found in soil, marine sediments, and the gut of grazing animals [4] [5] [6] [7] [8] . BTX is the protein responsible for causing botulism, a potentially fatal illness. Humans can be exposed to the neurotoxin through inhalation, ingestion, or surface wounds. There are seven forms of the protein, named A through G, that are structurally similar but create different immune responses [9]. The forms of BTX that most often cause botulism in humans are A, B, and E [10].

Structure

Function

Disease

Botulism is characterized by paralysis due to the interference of BTX with the release of acetylcholine at nerve synapses. The lethal doses for a human weighing 70 kg is 0.09-0.15 μg when administered intravenously or intramuscularly, 0.70 - 0.90 μg through inhalation, and 70 μg orally [11] [12]. Due to its powerful toxicity, the protein could be used as a biological weapon. The countries that have developed BTX to be used in warfare include Japan, Germany, United States, Russia, and Iraq [13].

Botulinum Toxin Neurotoxin Serotype A

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Structural Highlights

References

  1. ↑ Hall JD, McCroskey LM, Pincomb BJ, Hatheway CL. Isolation of an organism resembling Clostridium baratii which produces type F botulinal toxin from an infant with botulism. J Clin Microbiol. 1985;21:654-655. 36.
  2. ↑ Aureli P, Fenicia L, Pasolini B, Gianfranceschi M, McCroskey LM, Hatheway CL. Two cases of type E infant botulism caused by neurotoxigenic Clostridium butyricum in Italy. J Infect Dis. 1986;154: 207-211. 37.
  3. ↑ Arnon SS. Botulism as an intestinal toxemia. In: Blaser MJ, Smith PD, Ravdin JI, Greenberg HB, Guerrant RL, eds. Infections of the Gastrointestinal Tract. New York, NY: Raven Press; 1995:257-271.
  4. ↑ Ward BQ, Carroll BJ, Garrett ES, GB Reese. Survey of the U.S. Gulf Coast for the presence of Clostridium botulinum. Appl Microbiol. 1967;15:629–636. 26.
  5. ↑ Smith LDS. The occurrence of Clostridium botulinum and Clostridium tetani in the soil of the United States. Health Lab Sci. 1978;15:74–80. 27.
  6. ↑ Sugiyama H. Clostridium botulinum neurotoxin. Microbiol Rev. 1980;44:419–448. 28. Dodds KL. Clostridium botulinum in the environment. In: Hauschild AHW
  7. ↑ Dodds KL, eds. Clostridium botulinum—Ecology and Control in Foods. New York, NY: Marcel Dekker, Inc; 1992: 21–51. 29.
  8. ↑ Popoff MR. Ecology of neurotoxigenic strains of clostridia. In: Montecucco C, ed. Current Topics in Microbiology: Clostridial Neurotoxins. The Molecular Pathogenesis of Tetanus and Botulism. Vol 195. Berlin, Germany: Springer-Verlag; 1995: 1–29.
  9. ↑ Hatheway cL. Clostridium botulinum and other clostridia that produce botulinum neurotoxins. in: Hauschild aHW, Dodds kL, eds. Clostridium botulinum—Ecology and Control in Foods. new york, ny: marcel Dekker, inc; 1992: 3–10
  10. ↑ arnon SS, Schechter r, inglesby tV, et al. botulinum toxin as a biological weapon: medical and public health management. JAMA. 2001;285:1059–1070.
  11. ↑  Franz DR, Pitt LM, Clayton MA, Hanes MA, Rose KJ. Efficacy of prophylactic and therapeutic administration of antitoxin for inhalation botulism. In: DasGupta BR, ed. Botulinum and Tetanus Neurotoxins: Neurotransmission and Biomedical Aspects. New York, NY: Plenum Press; 1993:473-476.
  12. ↑  Herrero BA, Ecklung AE, Streett CS, Ford DF, King JK. Experimental botulism in monkeys: a clinical pathological study. Exp Mol Pathol. 1967;6:84-95.
  13. ↑ Dembek, Z. F.; Smith, L. A.; Rusnak, J. Botulinum Toxin. In Medical Aspects of Biological Warfare; 2007.
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