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Efficient and Site-specific Antibody Labeling by Strain-promoted Azide-alkyne Cycloaddition

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Self-cleavable stimulus responsive tags for protein purification without chromatography.

Xin Ge¹, Daniel S C Yang, Kimberly Trabbic-Carlson

¹Department of Chemical Engineering, McMaster University, 1280 Main Street West JHE-377, Hamilton, Ontario L8S 4L7, Canada.

Journal of the American Chemical Society

|August 11, 2005

Summary

This study presents a simple protein purification method using a tripartite fusion system. This technique rapidly isolates target proteins from E. coli lysate without affinity chromatography or proteases.

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Area of Science:

Biochemistry
Molecular Biology
Protein Purification

Background:

Traditional recombinant protein purification often relies on affinity chromatography and proteases.
These methods can be time-consuming, costly, and may damage the target protein.

Purpose of the Study:

To develop a simple, rapid, and protease-free method for recombinant protein purification.
To utilize a tripartite fusion system with intein and elastin-like polypeptide (ELP) for efficient protein isolation.

Main Methods:

A fusion protein construct containing the target protein, intein, and ELP was expressed in E. coli.
Purification involved NaCl-induced aggregation of the ELP tag, followed by microfiltration.
Target protein cleavage and isolation were achieved through intein activity and subsequent ELP phase transitions.

Main Results:

The tripartite fusion system enabled rapid isolation of the target protein directly from E. coli lysate.
The method successfully purified proteins without requiring affinity chromatography or exogenous proteases.
Reversible phase transitions of the ELP tag facilitated selective aggregation and resolubilization of the fusion protein.

Conclusions:

This novel purification strategy offers a simplified and efficient alternative for recombinant protein isolation.
The intein-ELP fusion system provides a versatile platform for protein purification, minimizing processing steps and potential protein damage.