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Microbiology and Molecular Biology Reviews, September 2004, p. 373-402, Vol. 68, No. 3
1092-2172/04/$08.00+0     DOI: 10.1128/MMBR.68.3.373-402.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Binary Bacterial Toxins: Biochemistry, Biology, and Applications of Common Clostridium and Bacillus Proteins

Holger Barth,1* Klaus Aktories,1 Michel R. Popoff,2 and Bradley G. Stiles3*

Institut für Experimentelle und Klinische Pharmakologie und Toxikologie der Albert-Ludwigs-Universität Freiburg, Freiburg, Germany,1 CNR Anaerobies, Institut Pasteur, Paris, France,2 U.S. Army Medical Research Institute of Infectious Diseases, Toxinology Division, Fort Detrick, Maryland3

Certain pathogenic species of Bacillus and Clostridium have developed unique methods for intoxicating cells that employ the classic enzymatic "A-B" paradigm for protein toxins. The binary toxins produced by B. anthracis, B. cereus, C. botulinum, C. difficile, C. perfringens, and C. spiroforme consist of components not physically associated in solution that are linked to various diseases in humans, animals, or insects. The "B" components are synthesized as precursors that are subsequently activated by serine-type proteases on the targeted cell surface and/or in solution. Following release of a 20-kDa N-terminal peptide, the activated "B" components form homoheptameric rings that subsequently dock with an "A" component(s) on the cell surface. By following an acidified endosomal route and translocation into the cytosol, "A" molecules disable a cell (and host organism) via disruption of the actin cytoskeleton, increasing intracellular levels of cyclic AMP, or inactivation of signaling pathways linked to mitogen-activated protein kinase kinases. Recently, B. anthracis has gleaned much notoriety as a biowarfare/bioterrorism agent, and of primary interest has been the edema and lethal toxins, their role in anthrax, as well as the development of efficacious vaccines and therapeutics targeting these virulence factors and ultimately B. anthracis. This review comprehensively surveys the literature and discusses the similarities, as well as distinct differences, between each Clostridium and Bacillus binary toxin in terms of their biochemistry, biology, genetics, structure, and applications in science and medicine. The information may foster future studies that aid novel vaccine and drug development, as well as a better understanding of a conserved intoxication process utilized by various gram-positive, spore-forming bacteria.

* Corresponding author. Mailing address for Holger Barth: Institut für Experimentelle und Klinische Pharmakologie und Toxikologie der Albert-Ludwigs-Universität Freiburg, Otto-Krayer-Haus, Albertstrasse 25, D-79104 Freiburg Germany. Phone: (49) 761-203-5308. Fax: (49) 761-203-5311. E-mail: holger.barth{at}pharmakol.uni-freiburg.de. Mailing address for Bradley Stiles: Toxinology Division, U.S. Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD 21702-5011. Phone: (301) 619-4809. Fax: (301) 619-2348. E-mail: bradley.stiles{at}amedd.army.mil.

Microbiology and Molecular Biology Reviews, September 2004, p. 373-402, Vol. 68, No. 3
1092-2172/04/$08.00+0     DOI: 10.1128/MMBR.68.3.373-402.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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