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Structural determinants for the binding of anthrax lethal factor to oligomeric protective antigen
Roman A Melnyk1, Krissi M Hewitt, D Borden Lacy
1Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, Massachusetts 02115, USA.
The Journal of Biological Chemistry
|November 19, 2005
Summary
Anthrax lethal toxin (LF) assembly involves the lethal factor (LF) binding to protective antigen (PA). This study reveals the specific surface on LF(N) that interacts with PA, clarifying toxin structure and potential drug targets.
Area of Science:
- Biochemistry
- Molecular Biology
- Toxicology
Background:
- Anthrax lethal toxin is a critical virulence factor.
- Toxin assembly involves lethal factor (LF) binding to protective antigen (PA).
- LF(N) interacts with oligomeric PA for cell entry.
Purpose of the Study:
- To define the interaction surface between LF(N) and PA.
- To elucidate the structural basis of anthrax lethal toxin assembly.
- To identify potential targets for therapeutic intervention.
Main Methods:
- Enhanced peptide amide hydrogen/deuterium exchange mass spectrometry (PX-MS).
- Directed mutagenesis.
- Analysis of LF(N)-PA interactions.
Main Results:
- A continuous surface on LF(N) was identified as the PA binding site.
- Mutational analysis confirmed residues interacting with PA.
- LF(N) spans the PA subunit interface, explaining stoichiometry.
Conclusions:
- The study elucidates the structural mechanism of anthrax lethal toxin assembly.
- Understanding the LF(N)-PA interaction is key for developing inhibitors.
- This research provides a foundation for novel therapeutic strategies against anthrax.