Symmetry disruption commits vault particles to disassembly

Area of Science:

• Biochemistry
• Structural Biology
• Nanotechnology

Background:

• Vaults are ubiquitous ribonucleoprotein particles involved in diverse cellular processes.
• Their symmetrical structure, assembled from major vault protein, forms a protective shell.
• Vaults show potential as nanodevices for delivering multiple cargos.

Purpose of the Study:

• To characterize the molecular determinants governing the vault opening process.
• To elucidate the structural changes involved in accessing the vault's inner cavity.
• To inform engineering efforts for tailored vault-based cargo delivery.

Main Methods:

• Vault recombinant reconstitution.
• Structural techniques to analyze vault conformation.
• Analysis of protein-protein interactions during vault assembly and disassembly.

Main Results:

• Vault opening begins with relaxation at the vault waist, expanding the inner cavity.
• Disengagement of amino-terminal domains at the vault midsection triggers conformational changes.
• These changes lead to vault aperture, enabling cargo access.

Conclusions:

• A previously uncharacterized step in the vault lifecycle has been identified.
• The molecular mechanism of vault opening is now better understood.
• Findings will aid the engineering of vaults for specific cargo delivery applications.