Synthesis and characterization of human prorenin in Escherichia coli

Area of Science:

• Biochemistry
• Molecular Biology
• Recombinant Protein Expression

Background:

• Human prorenin is a key enzyme in the renin-angiotensin system, regulating blood pressure.
• Efficient and reliable methods for producing active human prorenin are crucial for research and therapeutic development.

Purpose of the Study:

• To develop a method for expressing and purifying biologically active human prorenin using recombinant DNA technology in Escherichia coli.
• To characterize the biochemical and immunochemical properties of the recombinant human prorenin.

Main Methods:

• DNA sequences for human prorenin and an Ile-Glu-Gly-Arg linker were cloned into the pTR501 expression vector under the control of the E. coli trp promoter.
• E. coli cells were transformed, and the resulting hybrid protein was expressed, purified, and renatured.
• Blood coagulation factor Xa was used to cleave the hybrid protein, releasing mature human prorenin.

Main Results:

• High-level expression (30% of total cell protein) of a hybrid protein containing human prorenin was achieved in E. coli.
• The chimeric protein was successfully purified and renatured.
• Cleavage with factor Xa yielded human prorenin that was activatable by trypsin and showed biochemical and immunochemical similarity to natural prorenin.

Conclusions:

• Recombinant DNA technology in E. coli provides an effective system for producing human prorenin.
• The purified recombinant human prorenin retains biological activity and key properties of the native enzyme.
• This method offers a scalable approach for obtaining human prorenin for further study and potential applications.