Expression Vector with External Dual Promoters for Rapid BGC Activation
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Solution Overview
Problem
Current methods for heterologous expression of biosynthetic gene clusters (BGCs) are labor-intensive, time-consuming, and inefficient, often requiring extensive genetic manipulation and promoter refactoring to activate silent pathways, with no universal method to achieve robust expression of large NP pathways.
Innovation Solution
A dual-promoter vector is used to flank a cloning site externally, allowing for inducible transcription of BGCs, facilitating rapid and efficient expression of biologically active agents by placing promoters outside the BGC, thereby activating endogenous regulatory components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional heterologous expression methods are used for BGCs, then expression can be achieved, but the process is labor-intensive and time-consuming requiring extensive genetic manipulation and promoter refactoring
Solution Approach 1:
The invention extracts the promoter elements from the complex BGC structure and places them externally in the vector. This separation allows the promoter to be independently optimized and applied to multiple different BGCs without modifying the BGCs themselves, dramatically reducing the time and labor required for expression setup.
Solution Approach 2:
The vector design creates a universal platform where the same promoter-containing vector can be used to express diverse BGCs from different sources. This multi-functional vector eliminates the need to develop separate expression systems for each BGC, significantly improving productivity across the entire NP discovery pipeline.
2Ease of manufacture
If promoters are placed inside the BGC structure, then transcription can be controlled, but extensive genetic manipulation and promoter refactoring are required
Solution Approach 1:
Promoter elements are extracted from within the BGC structure and relocated to the vector backbone. This external placement simplifies the overall system by separating the regulatory function (promoter) from the biosynthetic function (BGC), making the expression setup process much easier and less complex.
Solution Approach 2:
The vector serves as an intermediary carrier that holds the promoter elements and facilitates their interaction with diverse BGCs. This intermediary structure mediates between the promoter and the BGC, eliminating the need for direct genetic manipulation of the BGCs themselves and reducing overall system complexity.
3Reliability
If traditional cultivation-based screening approaches are used, then known chemical scaffolds can be rediscovered, but over 99% of the time only known compounds are found despite millions of microbes screened
Solution Approach 1:
Instead of relying on traditional cultivation to discover compounds, the invention copies the genetic information (BGCs) directly from environmental samples through metagenomics. This copying approach bypasses the need for culturing and allows direct access to the genetic potential for novel compound production, dramatically increasing the likelihood of discovering new chemical scaffolds.
Solution Approach 2:
The invention replaces the mechanical cultivation-based screening system with a molecular biology-based system. Instead of physically growing and screening millions of microbes, the approach uses DNA extraction, sequencing, and heterologous expression to directly access and produce compounds from environmental genetic material, significantly improving both efficiency and novelty of discoveries.
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 reduces the time required to produce NP metabolites from months to days, enhancing the throughput and efficiency of NP discovery by achieving robust expression of BGCs in heterologous hosts.
Implementation Method 1
a first promoter and a second promoter flanking a cloning site, wherein the first promoter and second promoter direct transcription toward each other and in opposite directions
Data Source
AI summary
Disclosed herein are recombinant methods of activating expression of one or more biosynthetic gene clusters comprising more than one gene, the method comprising a recombinant DNA expression vector that possess two opposable inducible promoters that drives expression of a biosynthetic gene cluster exogenously from outside of the cluster to produce polyketides or non-ribosomal peptides in a heterologous host.