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Updated: Jun 20, 2026
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Pulldown Assay Coupled with Co-Expression in Bacteria Cells as a Time-Efficient Tool for Testing Challenging Protein-Protein Interactions
Published on: December 23, 2022
Over-producing soluble protein complex and validating protein-protein interaction through a new bacterial
Jumei Zeng1, Lei Zhang, Yuqing Li
1College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.
Protein Expression and Purification
|September 15, 2009
Summary
Researchers developed the pHEX co-expression vector to simplify studying protein complexes and interactions, especially for challenging toxic or hydrophobic proteins. This novel system efficiently co-produces and purifies these proteins, aiding in understanding their functions.
Area of Science:
- Molecular Biology
- Biochemistry
- Structural Biology
Background:
- Protein complexes and interactions are crucial for cellular functions.
- Studying toxic or hydrophobic proteins is challenging due to expression difficulties in standard hosts like Escherichia coli.
- Proper folding and stability often depend on partner proteins.
Purpose of the Study:
- To develop a novel co-expression vector system for studying protein complexes and interactions.
- To overcome limitations in expressing toxic or hydrophobic proteins.
- To facilitate the co-production and co-purification of heterodimeric protein complexes.
Main Methods:
- Development of the pHEX co-expression vector, compatible with existing E. coli vectors (pET, pGEX, pMAL).
- pHEX features a p15A origin of replication and a T7 promoter for His-tagged protein overproduction.
- Utilized in vivo pull-down assays to confirm protein-protein interactions.
Main Results:
- Successfully demonstrated efficient co-production and co-purification of heterodimeric complexes, including PE25/PPE41 and ESAT6/CFP10 from Mycobacterium tuberculosis.
- Characterized protein-protein interactions using convenient affinity tags.
- Confirmed three novel PE/PPE-related protein interactions in Mycobacterium tuberculosis using in vivo pull-down assays.
Conclusions:
- A convenient and efficient co-expression vector system (pHEX) has been successfully developed.
- The pHEX system effectively enables the study of protein complexes and interactions.
- This system has broad applicability across various biological organisms and protein types.
