E. coli B834 Protein Expression and Purification
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Solution Overview
Problem
The challenge lies in achieving high yield and purity of novel antibiotics with hydrophobic domains, which are difficult to assemble and express due to their complex structure, hindering their clinical application.
Innovation Solution
A method for highly expressing recombinant proteins from engineered E. coli bacteria using the pET system, specifically optimizing the culturing medium and purification process with E. coli B834 (DE3) and CM ion exchange columns to enhance protein expression and recovery rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional expression systems are used for recombinant proteins with hydrophobic domains, then protein expression can be achieved, but the yield and purity are insufficient due to assembly difficulties
Solution Approach 1:
The patent optimizes expression parameters including temperature (16°C low temperature expression), induction time, and medium composition to improve solubility and yield of hydrophobic domain proteins. This resolves the contradiction by changing physical parameters to favor proper folding and assembly without requiring complex assembly procedures
Solution Approach 2:
The patent uses a fusion tag system where a soluble partner protein is temporarily attached to the hydrophobic domain protein during expression. This intermediary facilitates proper folding and solubility, then is removed by protease cleavage to yield the native protein structure with high purity
2Manufacturing precision
If standard purification methods are used, then protein can be isolated, but purity is insufficient due to impurities present in the expression system
Solution Approach 1:
The patent employs multi-step purification segmentation including affinity chromatography, ion exchange chromatography, and size exclusion chromatography. Each step targets specific impurities and progressively increases purity, resolving the contradiction by systematically removing impurities through divided purification stages
Solution Approach 2:
The patent optimizes purification parameters including buffer composition, pH gradients, and salt concentrations to maximize protein recovery while minimizing impurity co-purification. This resolves the contradiction by tuning parameters to achieve high purity without excessive protein loss
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 approach significantly improves protein expression levels and purity, making the novel antibiotics more viable for clinical use by increasing yield and reducing impurities, as demonstrated by experimental data showing higher expression efficiency and antibacterial activity.
Implementation Method 1
extracting and purifying the recombinant protein from the supernatant, wherein the E. coli engineered bacteria with pET system is E.coli B834 (DE3), wherein the large-scale culturing medium used for said large-scale culturing of the seed bacteria solution has water as solvent and comprises the following components
Data Source
Figure 1a~1b
Figure 2a~3
AI summary
Provided are methods for highly expressing recombinant protein of engineering bacteria and the use thereof. The method comprises the following steps: (1) engineering bacteria of Escherichia coli with pET system are transfected with recombinant mutated plasmid to obtain positive monoclonal colonies; (2) the positive monoclonal colonies are enriched to obtain a seed bacteria solution, and the seed bacteria solution is induced to enrichment and growth in a large amount; and (3) the bacteria supernatant containing the recombinant protein as the expression target is separated, and then the recombinant protein in the bacteria supernatant is extracted and purified. The method is characterized in that the engineering bacteria of Escherichia coli with pET system are E. coli B834 (DE3). The components of the mass enrichment medium and the protein purification steps are also optimized such that a significant improvement in the yield and purity of the protein is achieved and the method is suitable for applying to the large-scale production of recombinant protein expressed by the engineering bacteria of Escherichia coli