Recombinant Pseudomonas putida for Lignocellulosic Hydrolysate Detoxification

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Solution Overview

Problem

The use of lignocellulosic biomass in biomanufacturing is limited due to the toxicity of furanic and phenolic aldehydes generated during acid- or alkali-based deconstruction, which are harmful to fermenting microorganisms, necessitating the development of economical methods for their removal from lignocellulosic hydrolysates.

Innovation Solution

Engineering recombinant microorganisms with specific genetic modifications, such as deletions of glucokinase, quinoprotein glucose dehydrogenase, and carbohydrate transporter genes, and the introduction of genes from Cupriavidus basilensis for enhanced consumption and catabolism of furfural and hydroxymethylfurfural, allowing for their selective detoxification from lignocellulosic hydrolysates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If acid- or alkali-based deconstruction strategies are used to release sugars from lignocellulosic biomass, then sugar release efficiency is improved, but toxic co-products (furanic and phenolic aldehydes) are generated that harm fermenting microorganisms

Engineering Contradiction:

Improvesugar release efficiencyVSAvoidtoxicity to fermenting microorganisms

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces heterologous gene clusters (hmf operon from Cupriavidus basilensis and fur operon from Pseudomonas putida) into P. putida, enabling the microorganism to convert the previously harmful furanic aldehydes (HMF and furfural) into valuable products. The hmf operon converts HMF to 2,5-furandicarboxylic acid, while the fur operon converts furfural to 2-furoic acid, thereby transforming toxic waste products into beneficial compounds that can be used in biomanufacturing.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Reliability

If conventional fermenting microorganisms are used, then fermentation capability is maintained, but they cannot tolerate the presence of furanic and phenolic aldehydes in the hydrolysate

Engineering Contradiction:

Improvefermentation capabilityVSAvoidtolerance to inhibitor compounds

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The engineered P. putida strain performs multiple functions simultaneously: it maintains robust fermentation capability for sugar consumption while acquiring the ability to detoxify furanic and phenolic aldehydes. The strain expresses native fermentation enzymes along with introduced detoxification pathways (hmf operon and fur operon), creating a multi-functional microorganism that can handle both sugar fermentation and inhibitor removal in the same system.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent uses P. putida as an intermediary organism that bridges the gap between sugar-containing hydrolysates and fermentation processes. The microorganism consumes sugars through native pathways while simultaneously processing toxic aldehydes through introduced enzymatic pathways, mediating the interaction between the hydrolysate composition and fermentation requirements.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If detoxification methods are developed to remove toxic compounds, then microorganism survival is improved, but additional process steps increase manufacturing complexity and cost

Engineering Contradiction:

Improvemicroorganism survivalVSAvoidprocess complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The engineered P. putida strain performs self-detoxification by expressing the hmf and fur operons that convert toxic aldehydes into less harmful compounds. Rather than requiring separate external detoxification steps, the microorganism itself provides the detoxification function through its metabolic pathways, integrating sugar consumption and toxin removal into a single self-sufficient biological system.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent merges sugar fermentation and detoxification functions into a single integrated biological system. The P. putida strain simultaneously performs glycolysis for sugar metabolism and expresses introduced enzymatic pathways for aldehyde conversion, combining what were previously separate unit operations into one unified bioprocess that reduces overall system complexity.

Inventive Principle:

Principle #5Merging (Combining)

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 microorganisms effectively reduce the concentration of inhibitors in lignocellulosic hydrolysates, creating a safer environment for subsequent fermentation processes and enabling the utilization of lignocellulosic biomass as a renewable feedstock for biofuel and biochemical production.

Implementation Method 1

introduction of genes from Cupriavidus basilensis for enhanced consumption and catabolism of furfural and hydroxymethylfurfural

Methodology Applied

Scientific EffectCatabolism: Decomposition (biological)

Implementation Method 2

allowing for their selective detoxification from lignocellulosic hydrolysates

Methodology Applied

Scientific EffectFermentation: Fermentation

Data Source

PatentUS20240401067A1Microbes and methods for selective detoxification of lignocellulosic biomass

Publication Date: 2024.12.05 WISCONSIN ALUMNI RES FOUND

AI summary

Microbes and methods for selectively detoxifying lignocellulosic biomass, such as microbes and methods for removing furanic and phenolic aldehydes from lignocellulosic hydrolysates.