December 2, 2023


Tech as it is.

What are the Advantages and Disadvantages of Recombinant Protein Expression Systems 

Recombinant Protein

Recombinant Protein

Recombinant Protein: The expression of recombinant proteins has transformed both fundamental research and therapeutic treatment. This approach was first used to determine the three-dimensional protein structures; later, it paved the way for cutting-edge uses in diagnostics and therapy.  

This technique’s flexibility, along with the use of high-quality reagents, supports the production of functional proteins with a wide range of potential uses. The most important thing is how creative the research teams can be. 

This post will shed light on recombinant protein expression significant benefits and drawbacks. We’ll also discuss various applications and the role of these expression systems in those applications. 


The invention of cloning and genetic engineering has facilitated the isolation and expression of heterologous proteins for scientific applications. Furthermore, technological advancements have permitted the isolation and large-scale expression of recombinant proteins.  

However, the protein proteins for large-scale applications such as antibody synthesis, enzyme manufacturing, and vaccine production are high. Under these conditions, the mechanism or system by which a protein acquires its expression should be simple to maintain and cultivate, create vast quantities of protein, and multiply. 

In addition, mammalian proteins frequently undergo several post-translational changes. The protein expression service comprises mammalian, bacteria, or insect systems that can identify protein expressions.  

What are Recombinant Protein Expression Systems 

Proteomics studies entail evaluating the specific characteristics of proteins, such as their function, localizations, modifications, structure, and interactions. Proteins often require functional protein production techniques to change how these proteins control biological processes. 

Chemical synthesis is unsuitable for this task because of the intricacy and quantity of proteins. Instead, all living cells and their specialized cellular components often utilize themselves as factories to produce and assemble proteins based on their genetic blueprints. 

DNA, unlike proteins, is simple to produce in vitro or synthetically using state-of-the-art recombinant DNA techniques. Thus, the DNA templates of specific genes can be changed or built to serve as a template for protein expressions with or without affinity tags and reporter sequences. Recombinant proteins are proteins that are synthesized and generated using these DNA templates. 

Standard recombinant protein expression services procedures involve transfecting cells using DNA vectors containing specific template sequences. A procedure of this nature then cultivates cells to translate and transcribe the custom protein manufacturing procedure. Typically, these cells are lysed to extract and further purify expressed proteins. 

Researchers employ both eukaryotic and prokaryotic in vivo protein expression fields. In addition, the choice of system should be determined by the protein type, desired yield, and functional activity requirements.  

It is crucial to recognize that each system has several benefits and drawbacks; you must pick the most appropriate design for a given application for efficient recombinant protein expression. 

Mammalian Protein Expression 

Due to its biologically active environment, the mammalian expression system is generally used to create mammalian proteins with the highest biological activity and structure. Such an experiment produces high levels of post-translational processing and functional activity. Mammalian protein expression fields are best-suited for expressing mammalian proteins.  

In addition, scientists typically employ these systems to generate complex proteins, antibodies, and proteins for cell-based functional tests. However, these advantages come with relatively challenging cultural circumstances. 

Compared to other expression systems, these proteins include more post-translational modifications and native folding, such as glycosylation. In addition, foreign or custom protein synthesis produces more active proteins than prokaryotic expression systems and other eukaryotic expression fields, such as insect and yeast cells. The downside of adopting this expression system is that its needs are high, its execution is complex, its yield is low, and it can lead to viral infections. 

Insect Protein Expression 

Researchers have previously employed insect cells for high-level protein expression with numerous changes comparable to mammalian systems, and this information is crucial. Moreover, many techniques create recombinant baculovirus, then manufacture the desired protein in insect cells. 

In addition, these systems can rapidly scale up and adjust to suspension culture for specific large-scale protein expressions that work like mammalian proteins. Unfortunately, since yields can increase by 500 mg/L, recombinant baculovirus synthesis can be more time-consuming and costly than prokaryotic techniques. 

Bacteria Expression System 

An E.coli expression system is one of the most developed and fundamental recombinant protein expression systems. Its principal approach involves the administration of a vector that inserts specific DNA fragments into the host cells. After that, they promote protein expression using IPTG. 

Since E. coli is the most extensively used and earliest established expression system, it offers various advantages of a transparent genetic background, including low cost, rapid breeding, simple product purification, high expression, powerful anti-pollution capability, excellent stability, and a wide application range. However, this system has numerous flaws compared to prokaryotic expression systems. 

For instance, a bacterial expression system does not have soluble proteins. Incorrectly folded proteins in the cytoplasm can form insoluble clumps known as inclusion bodies, making purification more difficult.  

Moreover, the post-translational modifications of the prokaryotic expression system are poor, causing the expressed biological activity to be on the low side. As a result, scientists are designing more sophisticated systems enabling E. coli-impossible protein expressions, such as glycosylated proteins. 

Final Thoughts 

As you can see, you can employ any expression system, depending on your approach and intent. The prokaryotic expression method is ideal for structural studies, activity studies, and antigen generation that don’t need post-translational modifications.  

On the other hand, the mammalian expression system is suitable for manufacturing vaccines, proteins, and therapeutics that require post-translational modifications.