Engineered E. coli for High-Purity Glycolic Acid Production

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Solution Overview

Problem

Current methods for producing glycolic acid, such as chemical synthesis and biological methods using microorganisms, face challenges including low purity due to impurity content, long reaction times, and the production of by-products, which increase costs and complicate purification processes.

Innovation Solution

A process involving a microorganism with enhanced activity of enzymes catalyzing reactions from ethylene glycol to glycolaldehyde and from glycolaldehyde to glycolic acid, introduced via a plasmid, reduces reaction time and by-product formation, improving glycolic acid purity and yield.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If chemical synthesis method is used to produce glycolic acid, then production cost is reduced, but purity is lowered due to impurity content

Engineering Contradiction:

Improveproduction costVSAvoidpurity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent changes the production method from chemical synthesis to biological synthesis using engineered microorganisms. By modifying the biological system (introducing plasmids with enhanced enzyme genes), the process achieves high purity glycolic acid production while maintaining cost-effectiveness through efficient metabolic conversion of ethylene glycol.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If biological method using Pichia naganishii is used to produce glycolic acid, then purity is improved, but reaction time is extended to 120 hours

Engineering Contradiction:

ImprovepurityVSAvoidreaction time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The patent changes the microbial system from Pichia naganishii to engineered Escherichia coli with introduced plasmids containing enhanced enzyme genes. This biological parameter change reduces reaction time from 120 hours to approximately 24 hours while maintaining high purity through controlled enzymatic conversion.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the slow natural metabolic pathway of Pichia naganishii with an engineered E. coli system that has enhanced enzyme activity. The substitution of biological machinery (microorganism strain and enzyme system) achieves faster conversion rates while maintaining product purity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Manufacturing precision

If biological method using microorganisms is used to produce glycolic acid, then purity is improved, but by-product organic acids are produced

Engineering Contradiction:

ImprovepurityVSAvoidby-product organic acids

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The patent extracts and enhances specific enzyme functions by introducing plasmids containing genes for enhanced enzyme activity into E. coli. This selective enhancement of key enzymes (glycolaldehyde dehydrogenase and glycolic acid oxidase) while controlling other metabolic pathways minimizes by-product formation and improves glycolic acid purity.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent modifies the metabolic parameters of E. coli by introducing plasmids that enhance specific enzyme activities. This controlled biological parameter change directs metabolism toward glycolic acid production while suppressing pathways that generate by-product organic acids.

Inventive Principle:

Principle #35Parameter changes

4Productivity

If enzyme activity is enhanced by introducing plasmid to reduce reaction time, then productivity is improved, but device complexity increases

Engineering Contradiction:

Improveproduction rateVSAvoidgenetic engineering complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent uses biological engineering (plasmid introduction) instead of complex chemical catalysis systems. The genetic modification approach, while biologically complex, simplifies the overall process by using the microorganism's natural metabolic machinery enhanced through straightforward plasmid transformation, avoiding complex chemical reaction systems.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 allows for the efficient and cost-effective production of high-purity glycolic acid with reduced by-products, enabling its use as a raw material for polymers and other hydroxycarboxylic acids, while minimizing the need for glucose and reducing enzyme enhancement efforts.

Implementation Method 1

enhanced activity of an enzyme catalyzing a reaction from ethylene glycol to glycolaldehyde

Methodology Applied

Scientific EffectEnzyme catalysis: Enzyme

Implementation Method 2

enhanced activity of an enzyme catalyzing a reaction from glycolaldehyde to glycolic acid

Methodology Applied

Scientific EffectEnzyme catalysis: Enzyme

Data Source

PatentUS8728780B2Process for producing hydroxycarboxylic acid

Publication Date: 2014.05.20 MITSUI CHEMICALS INC

AI summary

An object of the invention is to produce a microorganism which yields high amounts in a short time of a hydroxycarboxylic acid reduced in impurity content. This invention further provides a process for producing a hydroxycarboxylic acid, including glycolic acid, using the microorganism. This process enables a hydroxycarboxylic acid having high purity to be supplied at low cost.