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Distinction between pore assembly by staphylococcal alpha-toxin versus leukotoxins
Olivier Joubert1, Joëlle Voegelin, Valérie Guillet
1Laboratoire de Physiopathologie et d'Antibiologie des Infections Bactériennes Emergentes et Nosocomiales, EA 3432, Institut de Bactériologie de la Faculté de Médecine, Université Louis Pasteur-Hôpitaux Universitaires de Strasbourg, 67000 Strasbourg, France.
Staphylococcal bipartite leukotoxins and alpha-toxin are pore-forming toxins. Modifications to leukotoxin N-termini do not impair function, indicating structural differences in pore formation.
Area of Science:
- Microbiology
- Structural Biology
- Biochemistry
Background:
- Staphylococcal bipartite leukotoxins and alpha-toxin are beta-barrel pore-forming toxins.
- Alpha-toxin's N-terminus forms a latch in the pore, while leukotoxin N-termini are part of the monomer core.
Purpose of the Study:
- To investigate the role of N-terminal extremities in bipartite leukotoxin pore formation.
- To compare the structural organization of leukotoxins with alpha-toxin.
Main Methods:
- Genetic modification of leukotoxin N-termini via glutathione S-transferase (GST) fusion.
- Introduction of disulfide bridges to link N-termini to adjacent beta-sheets.
Main Results:
- Modifications of leukotoxin N-termini did not abolish biological activity.
- Leukotoxins do not require extensive N-terminal extensions for functional pore formation.
Conclusions:
- Bipartite leukotoxins exhibit microheterogeneity in structural organization compared to alpha-toxin.
- The N-terminal extremities of leukotoxins play a different role in pore formation than in alpha-toxin.
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