Engineered E. Coli Gene Insertion for Aerobic Perchlorate Breakdown
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Solution Overview
Problem
Existing bacteria capable of perchlorate bioremediation, such as Dechloromonas and Dechlorosoma, are anaerobic and limited by oxygen inhibition, restricting their application to specific environments, and scaling is a challenge for industrial use.
Innovation Solution
Inserting perchlorate reductase genes (pcrABCD) and chlorite dismutase (Cld) into non-pathogenic E. coli to create a modified bacterium that can degrade perchlorates in a wider range of environments, including aerobic conditions, facilitating scalable bioremediation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing bacteria (Dechloromonas, Dechlorosoma) are used for perchlorate bioremediation, then perchlorate degradation capability is achieved, but application is restricted to anaerobic environments due to oxygen inhibition
Solution Approach 1:
The patent extracts the perchlorate degradation genes (pcrABCD and cld) from the source bacteria and transfers them to E. coli, separating the degradation function from the oxygen sensitivity constraint of the original bacteria. This allows the degradation capability to function in aerobic environments through the host's metabolic pathways.
Solution Approach 2:
The invention changes the physiological parameters of the host organism by selecting E. coli, which has different metabolic characteristics (aerobic capability) compared to the anaerobic source bacteria. This parameter change enables the degradation system to operate under aerobic conditions while maintaining functional reliability.
2Productivity
If source bacteria with perchlorate degradation genes are used, then perchlorate breakdown capability is achieved, but scaling for industrial use becomes challenging
Solution Approach 1:
The patent creates a copy of the degradation system in E. coli, which is a well-studied model organism with established cultivation protocols and scalable production methods. This copying approach allows industrial-scale bioremediation applications without the scaling challenges of the original source bacteria.
3Adaptability or versatility
If gene insertion is performed to create modified bacteria, then environmental adaptability is improved, but genetic modification complexity increases
Solution Approach 1:
The patent uses E. coli as a universal host organism that can be easily genetically modified and cultured under various conditions. The standardized genetic tools and protocols for E. coli reduce the complexity of genetic modification while achieving the desired environmental adaptability for perchlorate bioremediation.
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 modified E. coli can effectively break down perchlorates into less harmful products, making bioremediation more accessible and applicable to diverse environments, including those on Mars, without specialized equipment or chemicals.
Implementation Method 1
perchlorate reductase genes (pcrABCD)...breaks down perchlorates
Implementation Method 2
chlorite dismutase (Cld)...breaks down perchlorates into less harmful products
Data Source
AI summary
Aspects of the disclosure include the manufacture of non-naturally occurring bacteria for perchlorate bioremediation. An exemplary method includes determining a source bacteria having one or more source genes which code for perchlorate reduction and chlorite dismutase and determining a target bacteria that does not naturally include the source genes. A first sequence of deoxyribonucleic acid (DNA) is identified in the source genes that codes, in the source bacteria, for an ordered set of amino acids whose linear sequence results in a protein which breaks down perchlorates and a second sequence of DNA is determined which, if inserted into the target bacteria, would allow the target bacteria to code for the ordered set of amino acids. A gene package is built by replacing the first sequence of DNA with the second sequence of DNA and the gene package is inserted into the target bacteria, thereby forming a non-naturally occurring modified bacteria.