Isoprenoid Production Phase Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing isoprene in microorganisms face challenges such as growth inhibition when increasing metabolic flux for isoprenoid production, reliance on expensive inducers, and reduced productivity due to suboptimal culture conditions, particularly in high-temperature fermentation processes.
Innovation Solution
A method involving the growth of isoprenoid compound-forming microorganisms under sufficient concentrations of growth-promoting agents, followed by their reduction to induce isoprenoid compound formation, utilizing oxygen or phosphate concentrations to control oxygen consumption rates and promote isoprenoid synthesis without the need for expensive inducers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the metabolic flux in the MVA pathway is increased to enhance isoprenoid compound production, then the quantity of isoprenoid compounds is improved, but the growth of the microorganism is inhibited
Solution Approach 1:
The patent divides the fermentation process into two distinct phases: a growth phase where microorganisms are cultivated under conditions optimized for biomass accumulation, and a production phase where conditions are adjusted to maximize isoprenoid compound synthesis. This temporal segmentation allows the system to achieve both high cell density and high product yield without the growth inhibition that occurs when metabolic flux is continuously maximized.
2Reliability
If expensive inducers such as IPTG or tetracycline are added continuously to maintain isoprene production activity, then the production capability is maintained, but the production cost increases
Solution Approach 1:
The patent employs promoters that are automatically activated under specific environmental conditions (such as phosphate limitation or microaerobic conditions) without requiring external inducer addition. The system self-regulates the expression of isoprenoid biosynthesis genes in response to metabolic state changes, eliminating the need for continuous expensive inducer supplementation while maintaining production activity.
3Productivity
If the culture temperature is elevated to transfer from growth phase to formation phase for protein production, then the substance formation is induced, but the optimal metabolic rate for substrate consumption is reduced
Solution Approach 1:
Instead of using temperature elevation to induce production phase, the patent employs parameter changes in dissolved oxygen concentration or phosphate availability. These alternative parameter changes induce the transition from growth to production phase while maintaining the culture temperature at levels that preserve optimal substrate consumption rates and microbial metabolic efficiency.
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 allows for efficient and cost-effective production of isoprenoid compounds by separating growth and production phases, maintaining productivity while avoiding the use of expensive inducers and optimizing metabolic conditions.
Implementation Method 1
a first culture period in which an isoprenoid compound-forming microorganism is grown; a second culture period in which formation of an isoprenoid compound by the isoprenoid compound-forming microorganism is induced by reducing an oxygen consumption rate of the isoprenoid compound-forming microorganism
Implementation Method 2
when phosphate is present at a certain concentration or below in a culture medium
Data Source
Figure 1
Figure 2(A)~2(B)
Figure 3
AI summary
The present invention provides a method of producing an isoprenoid compound comprising: 1) culturing an isoprenoid compound-forming microorganism in the presence of a growth promoting agent at a sufficient concentration to grow the isoprenoid compound-forming microorganism; 2) decreasing a concentration of the growth promoting agent to induce formation of the isoprenoid compound by the isoprenoid compound-forming microorganism; and 3) culturing the isoprenoid compound-forming microorganism to form the isoprenoid compound. The method is characterized in that the growth phase of an isoprenoid compound-forming microorganism is separated from the formation phase of the isoprenoid compound.