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Protein Complex Assembly

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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Related Experiment Video

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Simple and Robust in vivo and in vitro Approach for Studying Virus Assembly

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Process for Standardizing and Assessing the Parameters Governing MS2 Virus-Like Particle Reassembly around Nucleic

Daniel de Castro Assumpcao¹, Emma S Vinokour², Madeline M Mills¹

¹Department of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois, USA.

Biorxiv : the Preprint Server for Biology

|December 22, 2025

Summary

This study standardizes MS2 virus-like particle (VLP) disassembly and reassembly for better nanotechnology and therapeutic delivery. Optimized methods improve VLP encapsulation efficiency and reliability.

Keywords:

Capsid assembly design of experiments self-assembly

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Area of Science:

Biotechnology
Nanotechnology
Materials Science

Background:

MS2 virus-like particles (VLPs) are crucial for nanotechnology and drug delivery.
Current VLP disassembly and reassembly protocols lack standardization, hindering reliable cargo encapsulation.

Purpose of the Study:

To systematically assess and optimize MS2 VLP disassembly and reassembly techniques.
To establish a standardized framework for quantifying VLP reassembly yield.
To identify key experimental factors influencing VLP reassembly efficiency.

Main Methods:

Optimization of acid-based disassembly and acid removal.
Development of a standardized reassembly yield quantification framework using size exclusion chromatography.
Full-factorial design of experiments to evaluate the impact of pH, sodium chloride concentration, and crowding agents on reassembly.

Main Results:

Optimized acid-based methods offer trade-offs between speed, recovery, and accessibility.
High sodium chloride concentration significantly inhibits MS2 VLP reassembly efficiency.
pH and crowding agents have minor effects on reassembly yield, with optimal conditions potentially extending beyond current experimental ranges.

Conclusions:

Provides practical guidelines and a reproducible framework for MS2 VLP disassembly and reassembly.
Enables more reliable and efficient encapsulation strategies for diverse applications.
Highlights the critical role of salt concentration in VLP reassembly processes.