Aerolysin Nanopore Structures Revealed at High Resolution in a Lipid Environment

Area of Science:

• Biochemistry
• Structural Biology
• Microbiology

Background:

• Aerolysin is a beta-pore-forming toxin from Aeromonas bacteria.
• Its narrow, charged pore lumen is valuable for nanopore sensing.
• Few aerolysin-like proteins have been structurally characterized in lipid environments.

Purpose of the Study:

• To present the first high-resolution atomic cryo-electron microscopy (cryo-EM) structures of aerolysin prepore and pore.
• To understand the key interactions in pore formation and beta-barrel positioning.
• To analyze pore mutations and identify structural features relevant for nanopore sensing.

Main Methods:

• High-resolution atomic cryo-electron microscopy (cryo-EM).
• Structural characterization in a membrane-like environment.

Main Results:

• First high-resolution structures of aerolysin prepore and pore in a membrane-like environment.
• Identification of key interactions for pore formation and beta-barrel anchoring.
• High-resolution architecture of key pore mutations.
• Precise identification of four constriction rings within the pore lumen.

Conclusions:

• The study provides critical structural insights into aerolysin pore formation.
• The identified structural features, including constriction rings, are highly relevant for advancing nanopore sensing technology.
• This work lays the foundation for future research on aerolysin-like proteins and their applications.