Dynamic Metabolic Control for Malonyl-CoA Biosynthesis Flux
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Solution Overview
Problem
Existing technologies have struggled to efficiently improve malonyl-CoA biosynthesis in E. The existing technologies have not effectively addressed the tightly regulated nature of malonyl-CoA, which is a central metabolite for various products, due to its complex regulatory connections and low intracellular concentrations, impeding bioprocess development.
Innovation Solution
A genetically modified microorganism with synthetic metabolic valves for dynamic and selective regulation of proteins such as glnB, fabI, gltA, and zwf, combined with controlled proteolysis and gene silencing, to deregulate central metabolism and enhance malonyl-CoA biosynthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If malonyl-CoA biosynthesis is improved through traditional methods (nutrient starvation, dynamic control, gene manipulation), then product flux may increase, but the tightly regulated nature of malonyl-CoA and its low intracellular concentrations (10-100 fold less than acetyl-CoA) continue to impede bioprocess development
Solution Approach 1:
The patent implements dynamic control systems that allow the metabolic network to transition between different regulatory states. By using inducible promoters and conditional gene expression, the system can dynamically adjust enzyme levels and metabolic flux in response to environmental signals, resolving the contradiction between maintaining regulatory stability and achieving high productivity.
Solution Approach 2:
The patent systematically varies multiple metabolic parameters simultaneously (enzyme activities, substrate availability, gene expression levels) to overcome the natural regulatory constraints. By changing parameters such as overexpressing ACCase, providing plasmid-born copies of accA and accB, and manipulating nitrogen regulation through glnB, the system achieves high malonyl-CoA flux despite its naturally low concentration and tight regulation.
2Stability of the object's composition
If central metabolites are tightly regulated to maintain cellular homeostasis, then metabolic stability is maintained, but bioprocess development for product synthesis is impeded
Solution Approach 1:
The patent segments the metabolic control system into distinct functional modules: growth-phase metabolism maintained by native regulation, and production-phase metabolism directed by engineered pathways. By separating these functions and providing alternative metabolic routes (plasmid-born genes, heterologous pathways), the system maintains homeostasis during growth while achieving high productivity during production.
Solution Approach 2:
The patent introduces intermediary elements such as plasmid-born gene copies, heterologous enzymes, and synthetic regulatory circuits that mediate between the tightly regulated central metabolism and product synthesis requirements. These intermediaries allow the system to bypass natural regulatory constraints while maintaining overall metabolic stability.
3Productivity
If gene manipulation is used to increase malonyl-CoA production, then flux to product may improve, but the complexity of nested feedback loops and cell-wide energy and carbon conditions makes control difficult
Solution Approach 1:
The patent employs universal strategies that work across different metabolic contexts: plasmid-born gene copies provide constitutive expression regardless of native regulation, inducible promoters offer uniform control points, and heterologous pathways provide alternative routes that bypass complex native feedback loops. These universal elements simplify control despite the underlying complexity.
Solution Approach 2:
The patent applies local quality by targeting specific enzymes and pathway nodes with precise genetic modifications rather than attempting to control the entire metabolic network. By focusing manipulation on key control points (ACCase, citrate synthase, isocitrate dehydrogenase) while leaving the rest of the regulatory network intact, the system achieves improved flux without managing the full complexity of the regulatory network.
Data Source
AI summary
Methods and microorganisms for improved malonyl-CoA flux and production of products having malonyl-CoA as a precursor. The methods comprise dynamically regulating, in a stationary phase of a method, a nitrogen regulatory protein. The methods may dynamically regulate more than one gene.