Recombinant Chitinase Engineering for Stability and Cost Reduction
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Solution Overview
Problem
Current chitinase-based biopesticides face challenges such as low expression levels, high production and purification costs, limited pH and temperature stability, toxicity to non-target species, and limited efficacy and spectrum of insecticidal and fungicidal activity, hindering their use in large-scale industrial applications.
Innovation Solution
A recombinant, modified chitinase enzyme from Brevibacillus laterosporus Lak 1210 is engineered for secretion in E. coli, exhibiting dual exo- and endochitinase activity, high thermostability, and broad pH tolerance, optimized for large-scale production and industrial use through novel purification methods like chitin adsorption affinity chromatography.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chitinase-based biopesticides are used, then insecticidal activity is achieved, but production and purification costs are high
Solution Approach 1:
The patent uses recombinant DNA technology to create copies of the chitinase gene from Brevibacillus laterosporus in E. coli hosts. Multiple identical copies of the gene are inserted into plasmids, enabling mass production of the enzyme through bacterial replication and expression, thereby reducing production costs while maintaining insecticidal activity.
Solution Approach 2:
The patent extracts and purifies the recombinant chitinase enzyme from E. coli culture supernatants using affinity chromatography with chitin beads. This extraction process isolates the active enzyme from complex bacterial cultures, enabling cost-effective purification while maintaining high insecticidal efficacy.
2Reliability
If chitinase expression is increased for better efficacy, then insecticidal activity improves, but production costs increase
Solution Approach 1:
The patent employs E. coli hosts with constitutive expression systems that automatically produce the recombinant chitinase enzyme without requiring external induction or complex regulation. The bacteria self-service by continuously expressing the chitinase gene, enabling high-level production efficiency while maintaining cost-effectiveness through simple fermentation processes.
3Adaptability or versatility
If chitinase stability is improved for broader application, then pH and temperature tolerance increases, but enzyme complexity increases
Solution Approach 1:
The patent optimizes fermentation parameters including pH, temperature, and induction conditions to maximize recombinant chitinase production and stability. By carefully controlling these parameters during E. coli cultivation and enzyme extraction, the patent achieves broad pH and temperature tolerance without modifying the enzyme's primary structure, thereby avoiding increased molecular complexity while enhancing adaptability.
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 recombinant chitinase demonstrates enhanced insecticidal efficacy, broad-spectrum activity, and stability, making it suitable for industrial applications in agriculture, medicine, and environmental biotechnology, with improved solubility and membrane permeability, and reduced toxicity to non-target species.
Implementation Method 1
Chitinases are glycosyl hydrolases that catalyze the hydrolytic cleavage of the β-1,4-glycoside bond
Implementation Method 2
chitin adsorption affinity chromatography
Data Source
AI summary
The present invention discloses a recombinant modified extracellular chitinase having an amino acid sequence set forth in SEQ ID NO. 4 or SEQ ID NO. 5 prepared by substituting two tyrosine (Y) residues with histidine (H) in the native chitinase of Brevibacillus laterosporus LAK 1210. The modified chitinase represents an advancement as it has improved thermal stability, wider optimum pH range, high efficacy, improved solubility and low toxicity. The present invention also provides compositions and improved methods for producing and purifying the recombinant modified chitinase by chitin affinity chromatography and chitin adsorption affinity chromatography using shrimp shell and crab shell, for large scale production at low cost. The modified chitinase has wide range of applications including prevention, treatment or modulation of phytopathogenic infection in a plant or a plant part.