Oxidative Refolding of Disulfide-Rich Peptides
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Solution Overview
Problem
Existing methods struggle to efficiently produce high-quality, disulfide bond-rich three-finger neurotoxin peptides and proteins, particularly due to challenges in correctly folding these proteins in bacterial expression systems like E. coli, and chemical synthesis methods are costly and complex.
Innovation Solution
A method involving the expression of disulfide-linked proteins in bacterial inclusion bodies, followed by solubilization and oxidative refolding in a controlled buffer system, using conditions such as specific urea or guanidine concentrations, and oxidative refolding under controlled pressure and temperature to achieve correct disulfide bond formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chemical synthesis is used to produce disulfide bond-rich peptides, then product quality can be achieved, but the process becomes extremely costly and complex with low productivity
Solution Approach 1:
The patent replaces chemical synthesis methods with a biological expression system followed by oxidative refolding. Instead of using complex chemical synthesis steps to form disulfide bonds, the invention uses bacterial expression to produce the peptide sequence, then applies controlled oxidation conditions to spontaneously form the correct disulfide bonds through oxidative refolding, thereby substituting a complex chemical process with a simpler biochemical approach
Solution Approach 2:
The patent changes the physical and chemical parameters of the refolding environment to enable correct disulfide bond formation. By controlling parameters such as oxidation potential, pH, temperature, and the presence of redox buffers during the refolding process, the invention achieves proper folding and disulfide bond formation without requiring complex synthesis procedures
2Productivity
If E. coli is used to express disulfide bond-rich proteins, then productivity can be improved, but the proteins cannot be correctly folded due to complex disulfide bond systems
Solution Approach 1:
The patent separates the protein production process into two distinct stages: first, high-yield expression of the peptide sequence in E. coli inclusion bodies, and second, controlled oxidative refolding to achieve correct folding. This segmentation allows each stage to be optimized independently - maximizing productivity in the expression phase and ensuring reliability in the refolding phase
Solution Approach 2:
The patent uses inclusion bodies as an intermediate form during the production process. The peptide is initially expressed in an insoluble, unfolded state within inclusion bodies, which protects it from degradation and allows high accumulation. This intermediate form is then solubilized and subjected to oxidative refolding, serving as a bridge between high-yield expression and correct folding
3Productivity
If Pichia pastoris secretion expression system is used, then some production can be achieved, but the efficiency remains very low for disulfide bond-rich proteins
Solution Approach 1:
The patent uses E. coli as a surrogate expression system that can be easily manipulated, rather than using the more complex Pichia pastoris system. By copying the successful strategy of inclusion body formation and oxidative refolding from other systems and applying it to E. coli, the invention achieves high productivity while maintaining ease of manufacture through well-established bacterial expression protocols
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
This method enables the reliable and scalable production of high-quality, correctly folded disulfide bond-rich peptides and proteins, such as three-finger neurotoxin peptides, with improved yield and purity, potentially replacing traditional and costly synthesis methods.
Implementation Method 1
solubilizing the inclusion body in a solubilization buffer, wherein optionally the solubilization buffer comprises urea and/or guanidine
Implementation Method 2
oxidatively refolding the inclusion body in a refolding buffer by reaction conditions
Data Source
AI summary
In alternative embodiments, provided are methods that are reliable and scalable for making disulfide bond rich peptides and proteins. In alternative embodiments, provided are oxidation refolding methods to produce disulfide bond rich peptides and proteins. In alternative embodiments, methods as provided herein can be used to make any disulfide bond-containing proteins, including but not limited to: three finger neurotoxin peptides (such as for example, rec-α-Bungarotoxin (rec-αBtx), rec-α-Cobratoxin (rec-αCTX), κ-Bungarotoxin (rec-κBtx), rec-MTa, rec-hannalgesin, rec-Mambalgin, rec-Slurp, rec-Pate), antibodies and antibody fragments (such as single chain antibody), extracellular domain of viral membrane proteins, cell surface receptors, other disulfide-bond rich toxin peptides (such as dendrotoxin, conotoxin) and the like.