Methanotroph Metabolic Tuning for Higher PHB Yield
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for an effective method to enhance the production of polyhydroxybutyrate (PHB) using methanotrophic bacteria, as existing methods face challenges in understanding their physiological characteristics and metabolic regulation, limiting industrial application.
Innovation Solution
A methanotrophic bacterium with enhanced malate thiokinase activity, achieved through modifications such as increased intracellular copy number, gene expression regulation, or amino acid sequence modifications, is used to produce PHB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If methanotrophic bacteria are used to produce PHB, then biodegradable plastic can be obtained with mechanical properties similar to petroleum-based plastics, but the production efficiency is low due to lack of understanding of physiological characteristics and metabolic regulation
Solution Approach 1:
The patent changes the metabolic parameters of methanotrophic bacteria by enhancing malate thiokinase activity through genetic modification. This parameter change in the metabolic pathway enables efficient conversion of carbon source to PHB, resolving the contradiction between maintaining PHB production capability and improving production efficiency.
Solution Approach 2:
The patent introduces malate thiokinase as an intermediary enzyme in the metabolic pathway. This enzyme acts as a mediator to facilitate the conversion of metabolic intermediates to PHB precursors, thereby improving production efficiency while maintaining the natural PHB production capability of methanotrophic bacteria.
2Productivity
If genetic modification is applied to enhance malate thiokinase activity, then PHB-producing ability is significantly increased, but the complexity of metabolic regulation understanding increases
Solution Approach 1:
The patent segments the complex metabolic regulation problem by focusing on a single key enzyme (malate thiokinase) rather than attempting to control the entire metabolic pathway. This segmentation approach allows for targeted genetic modification that simplifies the overall regulatory complexity while significantly enhancing PHB production.
Solution Approach 2:
The patent performs preliminary genetic modification to enhance malate thiokinase activity before PHB production. This preliminary action establishes an optimized metabolic state that facilitates high-yield PHB production without requiring complex real-time regulation during the production process.
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 enhanced methanotrophic bacterium produces PHB in high yield, facilitating its industrial production.
Implementation Method 1
the activity of malate thiokinase is enhanced, as compared to its endogenous activity
Implementation Method 2
Methanotrophic bacteria are methanotrophic bacteria that utilize methane as a carbon source and energy source
Data Source
Figure 1
Figure 2
AI summary
The present application relates to: a methanotroph having enhanced PHB productivity through a malate thiokinase activity that is greater than the intrinsic activity thereof, a PHB production method comprising a step of culturing the methanotroph in a medium; a PHB production composition comprising the methanotroph, a culture of the methanotroph, a fermentation product of the methanotroph or a combination of at least two thereof; and a PHB production use of the methanotroph.