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Affinity Labeling Detection of Endogenous Receptors from Zebrafish Embryos

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Affibody-Binding Ligands.

Annalisa Barozzi¹, R Ashton Lavoie¹, Kevin N Day¹

¹Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, NC 27695-7905, USA.

International Journal of Molecular Sciences

|May 31, 2020

Summary

This summary is machine-generated.

Researchers developed affibody-binding peptides for purifying small protein scaffolds called affibodies from bacterial lysates. The IGKQRI peptide demonstrated effective purification, showing high binding capacity and purity for affibody-based therapeutics.

Keywords:

affibody affinity chromatography biomanufacturing peptide ligands protein purification

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Area of Science:

Biotechnology
Protein Engineering
Affinity Chromatography

Background:

Antibodies are established tools, but alternative protein scaffolds like affibodies offer advantages.
Affibodies are small proteins with tunable affinity, low immunogenicity, and high expression.

Purpose of the Study:

To develop novel peptide ligands for efficient purification of affibodies from bacterial lysates.
To identify peptides that target conserved domains within affibody structures.

Main Methods:

Screening a peptide library against model affibodies (anti-IgG, anti-albumin).
Synthesizing selected peptides on resin and evaluating binding capacity and recovery.
In silico docking to confirm interaction with conserved affibody domains.
Validating the IGKQRI ligand for anti-ErbB2 affibody purification from E. coli lysate.

Main Results:

Identified affibody-binding peptide candidates targeting conserved domains.
The IGKQRI ligand demonstrated high binding capacity (~5 mg/mL), affinity (K_D ~1 μM), and purity (86-91%).
The resin showed a long lifetime (100 cycles) and good recovery (64-71%).

Conclusions:

The IGKQRI peptide is a viable ligand for affibody purification via affinity chromatography.
This development facilitates the production of affibody-based bio-analytic reagents and therapeutics.
Peptide ligands offer a promising alternative for protein purification processes.