Engineered Microorganisms for Gas-to-Amino Acid Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing small molecules like lysine and other amino acids using microorganisms are limited in efficiency and scalability, particularly when relying on traditional enzymatic pathways and carbon sources.
Innovation Solution
The use of engineered and natural microorganisms, such as Cupriavidus necator and Ralstonia eutropha, that can convert carbon-containing gases like syngas into amino acids by overexpressing specific enzymes involved in lysine biosynthesis and secretion, such as aspartate kinase and dihydrodipicolinate synthase, and utilizing genetic modifications to enhance production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional enzymatic pathways are used for amino acid production, then the process is well-established and reliable, but the production efficiency and scalability are limited
Solution Approach 1:
The patent changes the fundamental parameters of the production system by switching from traditional organic carbon sources to gaseous carbon sources (CO, CO2, C1 compounds). This parameter change enables the use of engineered microorganisms with modified metabolic pathways, dramatically increasing production efficiency while using gaseous substrates that can be directly converted to amino acids through engineered enzymatic pathways
Solution Approach 2:
The engineered microorganisms are designed to perform multiple functions: they can utilize various gaseous carbon sources (CO, CO2, C1 compounds like methanol and methane) and convert them through modified metabolic pathways to produce amino acids. This multi-functionality allows the same biological system to handle different gas inputs and produce multiple amino acid products, improving both efficiency and versatility
2Quantity of substance
If gaseous carbon sources are used with engineered microorganisms, then production yield increases significantly, but the metabolic pathway complexity increases
Solution Approach 1:
The complex metabolic pathway is segmented into distinct functional modules: gas uptake systems, carbon fixation pathways (such as the Wood-Ljungdahl pathway), central metabolism, and amino acid biosynthesis pathways. Each module can be independently engineered and optimized, with specific enzymes like carbon monoxide dehydrogenase, acetyl-CoA synthase, and aspartate kinase being targeted for overexpression or modification to enhance overall production yield
Solution Approach 2:
The patent introduces intermediary compounds and enzymes that facilitate the conversion of gaseous carbon sources to amino acids. Key intermediaries include acetyl-CoA, formyl-CoA, and various amino acid precursors. Engineered enzymes such as carbon monoxide dehydrogenase and C1 transferases act as mediators to bridge the gap between gaseous substrates and the central amino acid biosynthesis pathways, enabling efficient conversion while managing metabolic complexity
3Productivity
If traditional liquid carbon sources are used, then the cultivation process is simple, but the scalability and sustainability are limited
Solution Approach 1:
The patent fundamentally changes the physical state of the carbon source from liquid to gas, enabling direct aeration of cultures with gaseous substrates (CO, CO2, C1 compounds). This parameter change simplifies the overall cultivation process by eliminating the need for complex liquid substrate preparation and feeding systems, while simultaneously improving scalability through the use of inexpensive, readily available gaseous carbon sources that can be supplied continuously
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 increases the production yield of lysine and other amino acids, as demonstrated by strains like Cupriavidus necator DSM541, which secretes higher concentrations of lysine into the medium, showcasing enhanced enzymatic activity and metabolic pathways for industrial-scale application.
Implementation Method 1
Methods for harvesting amino acids, comprising: culturing in growth medium comprising a carbon-containing gas a bacterial cell that can grow in the presence of a carbon-containing gas and that secretes amino acids into the growth medium
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
Aspects of the invention relate to methods of producing small molecules for industrial application using natural organisms and engineered organisms.