Cementing proteins provide extra mechanical stabilization to viral cages

Area of Science:

• Virology
• Materials Science
• Biophysics

Background:

• Viral shell stability is critical for viral life cycles and potential applications in materials science.
• Maturation involves structural changes, often including the binding of decoration proteins like gpD to the viral shell.
• Bacteriophage lambda capsids serve as a model system for studying these phenomena.

Purpose of the Study:

• To characterize the mechanical stability of gpD-free and gpD-decorated bacteriophage lambda capsids.
• To investigate the impact of gpD incorporation on capsid resistance to deformation and molecular fatigue.

Main Methods:

• Mechanical characterization of viral capsids.
• Molecular fatigue experiments simulating Brownian collisions in crowded environments.

Main Results:

• Incorporation of gpD into the lambda capsid provides significant mechanical reinforcement.
• Decorated capsids exhibit enhanced resistance to punctual deformations.
• gpD-decorated particles are particularly robust against low-energy (few kBT) molecular collisions.

Conclusions:

• The decoration protein gpD plays a vital role in reinforcing bacteriophage lambda capsids.
• This reinforcement enhances capsid resilience in environments with frequent molecular interactions.
• Findings have implications for both fundamental virology and the development of virus-based nanomaterials.