Microbial Ester Production via Enzyme Engineering

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Solution Overview

Problem

Current methods for producing fatty acid esters, such as Fischer esterification, are energy-intensive, generate significant waste, and have low bioproduction levels, making them environmentally unfriendly and economically uncompetitive with abiotic approaches.

Innovation Solution

Genetically modified microorganisms, specifically Clostridium strains, are engineered to enhance the activity of alcohol acyltransferase and lipase enzymes, significantly increasing the production of esters like n-butyl acetate and n-butyl butyrate through biological pathways.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If Fischer esterification is used for ester production, then ester production can be achieved, but energy consumption is high and waste generation is significant

Engineering Contradiction:

Improveenergy consumptionVSAvoidester production level

Core Design Contradiction:

Loss of energyVSProductivity

Solution Approach 1:

The patent replaces the chemical catalysis system (Fischer esterification using inorganic catalysts and high temperature) with a biological system (microbial enzymes such as alcohol acyltransferase and lipase). This substitution eliminates the need for high energy input and inorganic catalysts, achieving both low energy consumption and high ester production levels through biocatalysis.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the operating parameters from high temperature and inorganic catalysts to mild conditions (ambient temperature, neutral pH) using microbial enzymes. This parameter transformation enables the reaction to proceed efficiently under energy-saving conditions while maintaining high productivity.

Inventive Principle:

Principle #35Parameter changes

2Object-generated harmful factors

If conventional bioproduction techniques are used, then environmental benignity is improved, but production levels are low and economic competitiveness is reduced

Engineering Contradiction:

Improveenvironmental impactVSAvoidester production level

Core Design Contradiction:

Object-generated harmful factorsVSProductivity

Solution Approach 1:

The patent uses genetically modified microorganisms that replicate and amplify the desired ester production function. By introducing and enhancing specific enzyme genes (alcohol acyltransferase and lipase) in microbial strains, the system achieves high production levels while maintaining the environmentally benign characteristics of biological processes.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent creates composite biological systems by combining multiple enzyme functions (alcohol acyltransferase and lipase) within a single microbial cell. This composite approach enables simultaneous production of multiple esters (n-butyl acetate, n-butyl butyrate, isopropyl acetate) at high levels, achieving both environmental sustainability and economic viability.

Inventive Principle:

Principle #40Composite materials

3Productivity

If microbial ester production is enhanced through genetic modification, then production levels increase significantly, but strain development complexity increases

Engineering Contradiction:

Improveester production levelVSAvoidstrain development complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the complex ester production process into distinct functional modules: alcohol acyltransferase for acetyl-CoA to alcohol conversion and lipase for fatty acid to ester conversion. By introducing and optimizing these separate enzyme systems independently, the patent achieves high production levels while managing the complexity through modular genetic engineering.

Inventive Principle:

Principle #1Segmentation

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 results in a 1-3 orders of magnitude increase in ester production, achieving unprecedented levels of butyl acetate and butyl butyrate, making the process more environmentally benign and economically viable.

Implementation Method 1

genetically modifying the microorganisms to introduce or enhance the activity of one or both of an alcohol acyltransferase and a lipase

Methodology Applied

Scientific EffectEnzyme catalysis: Enzyme

Implementation Method 2

Conventionally, esters are produced through Fischer esterification which involves high temperature and inorganic catalysts

Methodology Applied

Scientific EffectFischer esterification: Chemical Bonding

Implementation Method 3

ester production through biological routes is renewable and environmentally benign

Methodology Applied

Scientific EffectFermentation: Fermentation

Data Source

PatentUS20230340400A1Microbial ester production

Publication Date: 2023.10.26 AUBURN UNIVERSITY

AI summary

Microorganisms and microbial production methods for the biosynthesis of ester compounds are provided. Useful examples employ microorganisms that have been genetically modified to express alcohol acyltransferases, either from other species or that have been modified to increase their activity in catalyzing the esterification of alcohols. Additional useful examples employ microorganisms that have been genetically modified to express lipases, either from other species or that have been modified to increase their activity in catalyzing the esterification of organic acids. Additional modifications are presented that significantly increase ester production.