Hybrid Polyketide Synthase Library Generation via Three-Hybrid Selection
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Solution Overview
Problem
The discovery and development of small molecules and natural products that bind to protein targets, such as polyketides and non-ribosomal peptides, is a slow and expensive process due to limitations in producing effective diversity libraries and selecting for binding to variable protein targets within cellular systems.
Innovation Solution
A three-hybrid selection system is developed, utilizing recombination 'hotspots' to generate hybrid polyketide synthases and create libraries of cells producing polyketides that can bind to specific protein targets, enabling the selection of cells producing polyketides that activate a reporter gene when binding to target proteins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional in vitro screening methods are used to discover small molecules binding to protein targets, then binding activity can be tested, but the process is slow and expensive requiring large compound libraries
Solution Approach 1:
The patent replaces traditional in vitro mechanical screening systems with a biological cellular system. Instead of isolating compounds and testing them in test tubes, the invention uses cells that naturally produce polyketides and express target proteins, allowing binding detection to occur within the living cellular environment. This substitution enables parallel screening of multiple compounds simultaneously through cellular phenotypes, dramatically reducing time while maintaining detection capability
Solution Approach 2:
The patent introduces a reporter gene system as an intermediary between the polyketide production and target protein binding detection. The reporter gene (such as antibiotic resistance genes) acts as a mediator that translates the binding event into a selectable phenotype. When polyketides bind to their target proteins within the cell, this interaction activates or maintains the reporter gene expression, enabling indirect but efficient detection of binding activity without direct in vitro testing
2Adaptability or versatility
If large diversity libraries are generated for screening, then the chance of finding active compounds increases, but the cost and complexity of the screening process increases significantly
Solution Approach 1:
The patent enables the cellular system to serve itself in producing and screening polyketides. The cells naturally produce diverse polyketide compounds through their endogenous polyketide synthase pathways and simultaneously express the target proteins and reporter genes needed for screening. This self-service capability eliminates the need for external compound synthesis and isolation steps, allowing high diversity libraries to be screened within the cellular system without proportionally increasing complexity
Solution Approach 2:
The patent creates a universal cellular platform that can screen multiple different target proteins and polyketide variants using the same system architecture. The reporter gene system is designed to work with various target proteins, and the cellular host can produce diverse polyketides through genetic variation. This multi-functionality allows a single screening system to handle multiple targets and compounds, reducing overall complexity compared to dedicated screening systems for each target
3Adaptability or versatility
If directed evolution methods are applied to polyketides, then binding variants can be selected, but the breadth of molecules that can be selected is limited and significant screening effort is required
Solution Approach 1:
The patent moves the screening process from a one-dimensional in vitro assay to a multi-dimensional cellular system. Instead of testing compounds in isolation, the invention incorporates binding detection within the cellular context where polyketides are produced, processed, and secreted naturally. This dimensional change allows simultaneous variation of multiple parameters (polyketide structure, target protein, cellular environment) to be screened in parallel, expanding the breadth of selectable molecules while improving efficiency through the natural cellular production pathway
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 method allows for the generation of diverse polyketide libraries with increased productivity and efficiency, reducing costs and improving the chances of finding molecules that bind to target proteins, while maintaining the balance of the biosynthetic network.
Implementation Method 1
a three-hybrid selection system comprising: first and second elements which are proteins and a third element which is a natural product selected from polyketides and non-ribosomal peptides, wherein the first and second elements can bind the third element
Data Source
AI summary
The present invention provides inter alia methods for generating a library of cells producing polyketides and selecting for these strains based on binding to a protein target.