Phenol Production via 4-Hydroxybenzoate Decarboxylase Extraction

Solution Overview

Problem

Current methods for producing phenol from renewable resources are inefficient due to the complexity of metabolic reactions and the cytotoxic nature of phenol, which inhibits bacterial proliferation, making industrial phenol production challenging and energy-intensive.

Innovation Solution

A Corynebacterium glutamicum transformant is constructed by transferring a 4-hydroxybenzoate decarboxylase gene, with disruption or deletion of the phenol 2-monooxygenase gene, and cultivated under reducing conditions to efficiently produce phenol from 4-hydroxybenzoate, overcoming cytotoxicity and improving productivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If phenol is produced using conventional methods from renewable resources, then phenol can be obtained, but the metabolic reaction consists of many steps resulting in low productivity

Engineering Contradiction:

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent extracts and isolates the specific enzymatic step (4-hydroxybenzoate decarboxylase) from the complex metabolic pathway. By using cell extracts containing this specific enzyme rather than relying on the entire metabolic pathway, the invention simplifies the process from many steps to a single critical reaction step, thereby resolving the contradiction between productivity and metabolic complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

2Object-affected harmful factors

If phenol is produced using renewable resources, then environmental sustainability is improved, but the process requires great amounts of solvent and thermal energy

Engineering Contradiction:

Core Design Contradiction:

Object-affected harmful factorsVSUse of energy by moving object

Solution Approach 1:

The patent replaces the conventional cumene process (which requires high thermal energy and solvent) with a biocatalytic system using 4-hydroxybenzoate decarboxylase. This enzymatic approach substitutes mechanical/thermal processing with biological catalysis, achieving phenol production from renewable resources with significantly reduced energy consumption and environmental impact.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If phenol production is carried out using bacteria, then renewable resource utilization is improved, but produced phenol inhibits bacterial proliferation

Engineering Contradiction:

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent extracts the phenol production function from the living bacterial system by using cell extracts containing 4-hydroxybenzoate decarboxylase. This separation allows phenol to be produced without the presence of living bacteria, eliminating the problem of phenol inhibiting bacterial proliferation while maintaining the ability to use renewable resources.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention uses cell extracts as an intermediary medium that contains the necessary enzyme (4-hydroxybenzoate decarboxylase) for phenol production. This intermediary allows the transfer of the phenol-producing capability from the bacterial system to a controlled extract system, resolving the contradiction between renewable resource utilization and bacterial survival.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Productivity

If phenol production is carried out using recombinant bacteria, then phenol can be produced from 4-hydroxybenzoate, but practical efficiency is insufficient

Engineering Contradiction:

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent uses cell extracts as a disposable, non-living catalyst system rather than maintaining living recombinant bacteria. The cell extracts can be prepared once and used repeatedly for phenol production, eliminating the need for complex bacterial cultivation, gene maintenance, and sterilization procedures, thereby significantly improving practical efficiency while maintaining high productivity.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 enables efficient phenol production from 4-hydroxybenzoate, overcoming the limitations of existing methods by inhibiting bacterial proliferation and enhancing productivity, thus providing a more sustainable and energy-saving process.

Implementation Method 1

a gene which encodes an enzyme having 4-hydroxybenzoate decarboxylase activity

Methodology Applied

Scientific EffectDecarboxylation:

Implementation Method 2

a gene which encodes an enzyme having phenol 2-monooxygenase activity

Methodology Applied

Scientific EffectHydroxylation:

Implementation Method 3

allowing the transformant as claimed in any of claims 1 to 6 to react in a reaction mixture containing 4-hydroxybenzoate or a salt thereof under reducing conditions

Methodology Applied

Scientific EffectEnzymatic catalysis: Enzyme

Data Source

PatentEP2639306B1Coryneform bacterium transformant and method for producing phenol using same

Publication Date: 2017.03.29

Figure 1~2d

AI summary

Provided is a phenol-producing transformant constructed by transferring a gene which encodes an enzyme having 4-hydroxybenzoate decarboxylase activity into Corynebacterium glutamicum as a host. Also provided is a process for producing phenol, which comprises a step of allowing the transformant to react in a reaction mixture containing 4-hydroxybenzoate or a salt thereof under reducing conditions, and a step of collecting phenol from the reaction mixture.