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Updated: Sep 27, 2026

Detection of Toxin Translocation into the Host Cytosol by Surface Plasmon Resonance
Published on: January 3, 2012
Anthrax toxin receptor proteins
Kenneth A Bradley1, John A T Young
1McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, 1400 University Avenue, Madison, WI 53706, USA. kbradley@microbio.ucla.edu
Abstract:
Anthrax toxin is a key virulence factor for Bacillus anthracis, the causative agent of anthrax. Here we discuss what is known about the anthrax toxin receptor (ATR), the cellular receptor for anthrax toxin, and how this information is being used to develop treatments for anthrax as well as to understand aspects of cancer. ATR was identified recently as a type I transmembrane protein with unknown function that contains an extracellular integrin-like inserted (I) domain. The ATR I domain contains the toxin binding site, and a soluble form of this domain was shown to serve as an effective antitoxin to protect cultured cells from toxin action. ATR is encoded by the tumor endothelial marker 8 (TEM8) gene, which is selectively up-regulated during blood vessel formation and in tumor vasculature, raising the possibility that this protein normally functions in angiogenesis. Therefore, identification of the cellular receptor for anthrax toxin has made possible new avenues of research in the areas of anthrax pathogenesis, antitoxin development, and cancer biology.
Insights
Researchers identified the anthrax toxin receptor (ATR), encoded by the TEM8 gene, which is crucial for Bacillus anthracis infection. This discovery opens new avenues for anthrax antitoxin development and cancer research.
Area of Science:
- Microbiology
- Molecular Biology
- Cancer Biology
Background:
- Bacillus anthracis toxin is a critical factor in anthrax pathogenesis.
- The cellular receptor for anthrax toxin (ATR) was recently identified.
- ATR is a type I transmembrane protein containing an integrin-like inserted (I) domain.
Purpose of the Study:
- To discuss the known information about the anthrax toxin receptor (ATR).
- To explore the application of ATR knowledge in developing anthrax treatments.
- To understand the role of ATR in cancer biology.
Main Methods:
- Identification of the anthrax toxin receptor (ATR).
- Characterization of the ATR protein structure and function.
- Investigation of the ATR gene (TEM8) expression patterns.
Main Results:
- The ATR I domain serves as the toxin binding site.
- A soluble form of the ATR I domain demonstrated effective antitoxin properties.
- The TEM8 gene, encoding ATR, is upregulated in tumor vasculature, suggesting a role in angiogenesis.
Conclusions:
- The identification of ATR provides a target for developing novel anthrax antitoxins.
- ATR's role in angiogenesis suggests potential applications in cancer therapy.
- Understanding ATR advances research in anthrax pathogenesis and cancer biology.
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