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Prokaryotic Transcriptional Activators and Repressors

Prokaryotic Transcriptional Activators and Repressors

The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...

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Related Experiment Video

Updated: Jun 13, 2025

The Logic, Experimental Steps, and Potential of Heterologous Natural Product Biosynthesis Featuring the Complex Antibiotic Erythromycin A Produced Through E. coli

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Efficient production of functional proaerolysin in E. coli.

Quynh Thi-Huong Pham¹, Ayako Tagawa², Narumi Iwata²

¹Nano Life Science Institute, Kanazawa University, Kanazawa, Japan; Institute of Biomedicine and Pharmacy, Vietnam Military Medical University, Hanoi, Viet Nam.

Protein Expression and Purification

|June 6, 2025

Summary

Researchers developed a high-yield method for producing soluble proaerolysin, a bacterial toxin used in diagnostics and research. This improved bacterial expression technique offers a reliable and cost-effective source of functional proaerolysin.

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Last Updated: Jun 13, 2025

The Logic, Experimental Steps, and Potential of Heterologous Natural Product Biosynthesis Featuring the Complex Antibiotic Erythromycin A Produced Through E. coli

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The Multifaceted Benefits of Protein Co-expression in Escherichia coli

The Multifaceted Benefits of Protein Co-expression in Escherichia coli

Published on: February 5, 2015

Area of Science:

Biochemistry
Molecular Biology
Biotechnology

Background:

Proaerolysin from Aeromonas hydrophila targets GPI-anchored proteins, inducing cell death.
It's crucial for diagnosing paroxysmal nocturnal hemoglobinuria (PNH) and used in genetic research.
Previous bacterial expression methods yielded low amounts of proaerolysin due to poor solubility.

Purpose of the Study:

To develop an efficient bacterial expression and purification method for soluble proaerolysin.
To overcome the low solubility limitations of previous production techniques.
To provide a reliable and cost-effective source of functional proaerolysin.

Main Methods:

Utilized the SHuffle E. coli strain for enhanced disulfide bond formation in the cytoplasm.
Optimized bacterial culture conditions for proaerolysin expression.
Purified recombinant proaerolysin to high purity (>99%).

Main Results:

Achieved high yields of soluble proaerolysin (approx. 3 mg from 50 mL culture).
Demonstrated >99% purity of the recombinant protein.
Confirmed the functionality of proaerolysin in mouse embryonic stem cells (mESCs).

Conclusions:

The SHuffle E. coli strain significantly improves proaerolysin solubility and folding.
This method provides a high-yield, cost-effective source of functional proaerolysin.
Enables broader applications of proaerolysin in diagnostics and biotechnology.