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Decrease in pH destabilizes individual vault nanocages by weakening the inter-protein lateral interaction.

Aida Llauró1, Pablo Guerra2, Ravi Kant3

  • 1Departamento de Física de la Materia Condensada, UAM, Francisco Tomás y Valiente 7, 28049-Madrid, Spain.

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Summary
This summary is machine-generated.

Vault particles, protein cages for molecular transport, destabilize and aggregate at low pH. This study reveals how pH changes affect vault structure and protein interactions, crucial for their application as transporters.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Nanotechnology

Background:

  • Vault particles are natural protein cages with potential as molecular containers.
  • Understanding vault stability is key for their use as functional transporters.
  • Previous studies suggested pH influences vault dynamics, but mechanisms were unclear.

Purpose of the Study:

  • To investigate the real-time structural evolution of individual vault particles under varying pH conditions.
  • To elucidate the mechanism by which pH affects vault stability and dynamics.

Main Methods:

  • Atomic Force Microscopy (AFM) to monitor individual vault particles.
  • Real-time pH manipulation during AFM imaging.
  • Quartz-Crystal Microbalance (QCM) and Differential Scanning Fluorimetry (DSF) for complementary analyses.

Main Results:

  • Decreasing pH destabilizes the barrel region of vault particles.
  • Low pH induces aggregation of vault particles.
  • AFM revealed topographical defects indicating weakened protein-protein bonds at low pH.

Conclusions:

  • pH significantly influences vault particle stability and dynamics within a biologically relevant range.
  • Low pH weakens inter-protein interactions, leading to structural defects and aggregation.
  • Findings provide critical insights into vault particle behavior for controlled delivery applications.