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Related Experiment Video

Updated: Mar 19, 2026

Creating Highly Specific Chemically Induced Protein Dimerization Systems by Stepwise Phage Selection of a Combinatorial Single-Domain Antibody Library

Creating Highly Specific Chemically Induced Protein Dimerization Systems by Stepwise Phage Selection of a Combinatorial Single-Domain Antibody Library

Published on: January 14, 2020

Combinatorial Pairwise Assembly Efficiently Generates High Affinity Binders and Enables a "Mix-and-Read" Detection

Kevin B Carlin¹, Carlos A Cruz-Teran¹, Jay Prakash Kumar^2,3

¹Department of Chemical and Biomolecular Engineering, North Carolina State University , Raleigh, North Carolina 27695, United States.

ACS Synthetic Biology

|June 9, 2016

Summary

Combinatorial assembly of low affinity binders creates high affinity protein binders. This method enhances target binding through intramolecular avidity, enabling sensitive protein quantification assays.

Keywords:

Sso7d binding affinity flexible linker split GFP yeast surface display

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Last Updated: Mar 19, 2026

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Published on: January 14, 2020

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Published on: October 20, 2018

Area of Science:

Protein engineering
Biotechnology
Molecular biology

Background:

Developing high-affinity protein binders is crucial for various biotechnological applications.
Traditional methods like random mutagenesis can be inefficient in generating binders with significantly improved affinity.

Discussion:

A combinatorial library approach using random pairwise assembly of low-affinity binders on an Sso7d scaffold was investigated.
This strategy demonstrated a higher frequency of high-affinity binders compared to libraries generated by monovalent mutagenesis alone.
The enhanced affinity resulted from intramolecular avidity, where linked binders targeting non-overlapping epitopes achieved a nanomolar dissociation constant (K_D).

Key Insights:

Individual binders with K_D values of approximately 1.3 μM and 250 nM were linked to create a bivalent binder with an apparent K_D of ~2 nM.
The resulting bivalent protein maintained thermal stability (T_M = 84.5 °C) and exhibited high expression yields in E. coli.
Fusion of these binders to split-green fluorescent protein (GFP) fragments enabled a target-dependent "mix-and-read" assay for quantification.

Outlook:

This combinatorial assembly method offers an efficient strategy for generating high-affinity protein binders.
The developed bivalent binders and associated assay have potential applications in diagnostics and molecular sensing.
Further exploration of this scaffold-based approach could lead to novel protein-based tools for biological research and clinical applications.