Insulin Expression Vector with Leader Peptide and Affinity Tag
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Solution Overview
Problem
Current methods for producing insulin in bacterial cells face challenges such as low yields, high proteolysis, short half-life, low inclusion body formation, and the presence of N-terminal Methionine residues, leading to complex and inefficient purification processes.
Innovation Solution
A novel expression vector is developed that includes a leader peptide with Methionine at the N-terminus followed by glycine for stability, an affinity tag, and a cleavage site, allowing for single-step enzymatic digestion to separate insulin from the leader peptide and C-chain, simplifying the purification process and increasing yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional vectors with strong promoters are used to increase protein expression, then expression level is improved, but protein stability deteriorates due to high proteolysis
Solution Approach 1:
The protein is segmented into two parts: a stable core protein (β-galactosidase) and a peptide chain (insulin). The core protein provides structural stability and protease resistance, while the peptide chain carries the functional sequence. This segmentation allows the stable core to protect the peptide from proteolysis while maintaining high expression levels.
Solution Approach 2:
The core protein acts as an intermediary carrier for the peptide chain. By fusing the peptide to the stable core protein, the peptide is protected from degradation while still being expressed at high levels. The core protein serves as a protective intermediary that enables both high expression and stability.
2Manufacturing precision
If multiple enzymatic cleavage steps are used to produce insulin from proinsulin, then protein purity is improved, but process complexity increases
Solution Approach 1:
Multiple enzymatic cleavage functions are merged into a single step using a broad-specificity protease. This single enzyme performs multiple cleavage reactions that would traditionally require separate steps, simplifying the purification process while maintaining high protein purity.
Solution Approach 2:
The protease enzyme parameters (substrate specificity, cleavage conditions) are optimized to enable single-step digestion. By adjusting enzyme parameters, multiple cleavage reactions are achieved in one step, reducing process complexity while maintaining precision.
3Manufacturing precision
If proinsulin inclusion bodies are produced and purified through complex procedures, then protein purity is improved, but yield decreases
Solution Approach 1:
The C-chain peptide is extracted and removed as a separate component during the cleavage process. By specifically removing only the C-chain while retaining the A and B chains, the process achieves high purity insulin with minimal yield loss, as opposed to complete degradation or complex purification.
4Productivity
If toxic substances like cyanogen bromide are used for cleavage, then cleavage efficiency is improved, but safety and cost increase
Solution Approach 1:
A safe, non-toxic protease enzyme is used instead of toxic chemical reagents. The enzyme is biodegradable, environmentally friendly, and can be easily removed from the final product. This replaces expensive and hazardous chemicals with a safer, more economical biological catalyst.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The expression vector enables high-yield production of insulin with stable inclusion bodies, reducing the complexity of purification and minimizing the use of toxic substances, resulting in a more efficient and effective insulin production process.
Implementation Method 1
The inclusion bodies are treated with a protease to cleave the leader peptide and C-chain from the fusion protein to produce insulin
Data Source
AI summary
A process for production of insulin or insulin analogs by expression of Insulin or Insulin analogs through an expression vector in a host cell is provided. The expression vector includes a leader peptide of SEQ ID NO 3; a nucleotide sequence encoding an affinity tag linked to C-terminal end or N terminal end of nucleotide sequence of the leader peptide; and a nucleotide sequence encoding for a cleavage site ligated to nucleotide sequence of the leader peptide through nucleotide sequence encoding the affinity tag.