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Related Experiment Video

Updated: Oct 29, 2025

Making Conjugation-induced Fluorescent PEGylated Virus-like Particles by Dibromomaleimide-disulfide Chemistry

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Single-Point Mutations in Qβ Virus-like Particles Change Binding to Cells.

Marisa L Martino¹, Stephen N Crooke², Marianne Manchester³

¹Department of Chemistry, The Scripps Research Institute, La Jolla, California 92037, United States.

Biomacromolecules

|July 12, 2021

Summary

This summary is machine-generated.

Modifying virus-like particles (VLPs) by altering lysine residues reduces unwanted cell binding. This research enables the development of safer VLPs for targeted delivery applications.

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Published on: June 16, 2011

Area of Science:

Biotechnology
Molecular Biology
Biochemistry

Background:

Virus-like particles (VLPs) are versatile platforms for functionalization.
Nonspecific cell association can limit VLP applications in biological systems.
Lysine residues are implicated in mediating these nonspecific interactions.

Purpose of the Study:

To investigate the role of lysine residues in VLP-cell interactions.
To engineer VLPs with reduced nonspecific binding for improved targeted delivery.

Main Methods:

Chemical acylation of surface-exposed amines on Qβ VLPs.
Site-directed mutagenesis of lysine residues on Qβ VLPs.
Assessing VLP association with mammalian cells.

Main Results:

Chemical acylation significantly reduced nonspecific VLP association with cells.
Single-point mutations were generally well-tolerated, while multiple mutations affected capsid integrity.
Specific mutations (K13E, K46Q) dramatically altered cellular binding.
Qβ VLPs interact with plasma membrane components independently of surface charge.

Conclusions:

Lysine residues play a critical role in mediating nonspecific VLP-cell interactions.
Mutational strategies can be employed to control VLP cellular binding.
Engineered VLPs with reduced nonspecificity offer potential for enhanced targeted delivery applications.