Methanotroph PHA Production via Copper-Limited sMMO Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The high cost of polyhydroxyalkanoates (PHAs) production limits their industrial production and commercial adoption, despite their environmental advantages, due to the energy and chemical intensive process of converting carbon-containing gases into PHAs.
Innovation Solution
The use of methanotrophic microorganisms, specifically those lacking soluble methane monooxygenase (sMMO) and expressing the ethylmalonyl-CoA pathway, to efficiently produce PHAs from carbon-containing gases, such as methane, at high concentrations and reduced energy and chemical inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If carbon-containing gases are used as substrate for PHA production, then carbon input cost is reduced, but energy and chemical input requirements increase significantly
Solution Approach 1:
The patent applies parameter changes by optimizing copper concentration in the culture medium to control the expression of soluble methane monooxygenase (sMMO) in methanotrophic microorganisms. By maintaining copper concentrations below 1 µM, the process reduces energy and chemical inputs while maintaining efficient PHA production from carbon-containing gases. This parameter optimization resolves the contradiction between using low-cost carbon substrates and minimizing energy consumption.
2Productivity
If copper concentration is increased to induce sMMO production, then PHA production efficiency increases, but cost and toxicity increase
Solution Approach 1:
The patent identifies and applies an optimal parameter range for copper concentration (below 1 µM) that induces sufficient sMMO expression for efficient PHA production while avoiding the costs and toxic effects of higher copper concentrations. This parameter optimization allows the system to achieve high productivity without proportionally increasing substance input costs.
Solution Approach 2:
The patent substitutes chemical induction methods with a biological control mechanism by utilizing the natural copper-responsive regulation of sMMO expression in methanotrophic microorganisms. Instead of using high concentrations of chemical inducers, the process exploits the microorganisms' endogenous regulatory system, replacing a chemical-intensive approach with a biologically-mediated control mechanism.
3Productivity
If sMMO is produced in methanotrophic microorganisms, then PHA production from methane is enhanced, but copper consumption and cost increase
Solution Approach 1:
The patent optimizes copper concentration parameters to achieve efficient sMMO-mediated PHA production while minimizing copper consumption. By maintaining copper levels below 1 µM, the process achieves high productivity with reduced substance loss and lower procurement costs, directly resolving the contradiction between enhanced production and reduced material consumption.
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 significantly reduces the energy, chemical, and carbon input-to-PHA output ratio, making carbon gas-derived PHA economically competitive with petrochemical-based plastics and enhancing the environmental and economic benefits of PHA production.
Implementation Method 1
The use of methanotrophic microorganisms, specifically those lacking soluble methane monooxygenase (sMMO) and expressing the ethylmalonyl-CoA pathway, to efficiently produce PHAs from carbon-containing gases, such as methane
Implementation Method 2
expressing the ethylmalonyl-CoA pathway, to efficiently produce PHAs from carbon-containing gases
Data Source
AI summary
Embodiments of the invention relate generally to methods to generate microorganisms and/or microorganism cultures that exhibit the ability to produce polyhydroxyalkanoates (PHA) from carbon sources at high efficiencies. In several embodiments, preferential expression of, or preferential growth of microorganisms utilizing certain metabolic pathways, enables the high efficiency PHA production from carbon-containing gases or materials. Several embodiments relate to the microorganism cultures, and/or microorganisms isolated therefrom.