Engineered Cells With Membrane Transporters for Indole Biosynthesis
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Solution Overview
Problem
Current methods for producing melatonin and 5-hydroxytryptophan (5HTP) rely heavily on chemical synthesis or plant extraction, lacking efficient biotechnological production methods that are cost-effective.
Innovation Solution
Engineering recombinant cells to overexpress genes encoding integral membrane proteins such as YhjV, GarP, ArgO, AcrAB, and LysP, or their functionally active variants, to enhance the export and import of indole-derivatives like melatonin and 5HTP, thereby improving production and tolerance to these compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical synthesis or plant extraction is used for producing melatonin and 5HTP, then production methods are established, but cost-effectiveness and efficiency are insufficient
Solution Approach 1:
The patent changes the fundamental parameter of production method from chemical synthesis/plant extraction to biological synthesis using recombinant cells. This involves modifying cellular parameters (overexpressing transporter proteins YhjV, GarP, ArgO, AcrAB, LysP) to optimize melatonin and 5HTP production, achieving both improved efficiency and cost-effectiveness through biotechnological processes
Solution Approach 2:
The patent uses recombinant cells as copies of natural production systems. By introducing and overexpressing specific transporter genes (YhjV, GarP, ArgO, AcrAB, LysP) in host cells, the patent creates engineered cell factories that copy and optimize natural metabolic pathways for producing melatonin and 5HTP, achieving superior production efficiency and cost-effectiveness
2Quantity of substance
If transporters are engineered to improve substrate uptake and product export, then production titers are improved, but cellular exchange mechanisms become more complex
Solution Approach 1:
The patent applies multi-functionality by selecting and overexpressing transporter proteins that can handle multiple functions: YhjV for amino acid transport, GarP for sugar transport, ArgO for arginine export, AcrAB for efflux pump activity, and LysP for lysine transport. These transporters serve multiple purposes in optimizing substrate uptake, product export, and cellular homeostasis, improving product titers without proportionally increasing engineering complexity
Solution Approach 2:
The patent segments the transporter engineering approach by targeting specific individual transporter genes rather than attempting to redesign the entire cellular exchange system. By independently optimizing each transporter (YhjV, GarP, ArgO, AcrAB, LysP) and combining them through overexpression, the patent achieves improved product titers while maintaining manageable engineering complexity through modular gene manipulation
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 recombinant cells demonstrate increased production and tolerance to indole-derivatives, facilitating more efficient biosynthetic pathways and downstream purification processes.
Implementation Method 1
Integral membrane proteins capable of transporting melatonin and other indole-derivatives across biological membranes
Implementation Method 2
recombinant cell comprising a biosynthetic pathway for producing an indole-derivative
Data Source
AI summary
Integral membrane proteins capable of transporting melatonin and other indole-derivatives across biological membranes, and uses thereof.