Recombinant Entomopathogenic Bacteria With Arabinose-Induced GXP Production
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Solution Overview
Problem
Existing methods do not effectively regulate the expression of the GXP synthase gene (gxpS gene) in entomopathogenic bacteria, limiting the production of GXPs that suppress insect immunity, thereby hindering efficient pest control.
Innovation Solution
Recombinant entomopathogenic bacteria are developed by replacing the promoter of the GXP synthase gene with an arabinose inducible promoter, allowing controlled expression and increased production of GXPs through the use of an arabinose inducer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the promoter of the GXP synthase gene is replaced with an arabinose inducible promoter, then the production of GXPs is increased and pest immunity is suppressed, but the complexity of bacterial strain construction is increased
Solution Approach 1:
The promoter replacement is performed in advance during the strain construction phase, so that the recombinant bacteria are prepared with the inducible promoter already integrated into the genome. This preliminary action allows for controlled GXP production during pest control applications without needing to modify the bacteria in the field.
Solution Approach 2:
The promoter replacement changes the regulatory parameter of the gxpS gene from constitutive expression to inducible expression. By introducing the arabinose inducible promoter, the expression level of the GXP synthase gene can be dynamically controlled based on environmental conditions and pest infestation levels, thereby optimizing GXP production.
2Productivity
If the gxpS gene expression is not effectively regulated, then the production of GXPs is limited and pest control efficiency is reduced, but implementing regulation mechanisms increases strain construction complexity
Solution Approach 1:
The regulatory parameter of the gxpS gene is changed by replacing the native promoter with an arabinose inducible promoter. This parameter change enables controlled expression of the GXP synthase gene, allowing high GXP production only when arabinose is present, thereby avoiding unnecessary complexity in continuous regulation systems.
Solution Approach 2:
Arabinose serves as an intermediary substance that mediates the regulation of gxpS gene expression. The presence of arabinose in the environment acts as a signal to activate the inducible promoter, thereby controlling GXP production without requiring complex genetic regulation circuits.
3Ease of operation
If recombinant bacteria with inducible promoters are constructed, then controlled GXP production is achieved, but the time required for strain preparation is increased
Solution Approach 1:
The promoter replacement and strain construction are completed in advance during the laboratory phase. The recombinant bacteria are prepared with the inducible promoter already integrated, so that during pest control applications, only simple media supplementation with arabinose is needed, significantly reducing the time required for field deployment.
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 bacteria produce large quantities of GXPs, effectively suppressing pest immunity and enhancing pest control efficacy, including synergistic effects with Bacillus thuringiensis.
Implementation Method 1
recombinant entomopathogenic bacteria in which a promoter of a GXP synthase gene (gxpS gene) is replaced with an arabinose inducible promoter
Implementation Method 2
The GXPs are produced by catalytic activity of a GXP synthase, which is an NRPS produced by a specific synthase gene (gxpS gene)
Implementation Method 3
GXPs are secondary metabolites commonly produced in Xenorhabdus and Photorhabdus (Tobias et al., 2017). The GXPs are assumed to play a unique role in these two bacterial genera, playing an important and common role in the pathogenicity cycle of nematode-bacterial mutualism
Data Source
AI summary
Proposed are recombinant entomopathogenic bacteria transformed using promoter replacement technique, a preparation method, and uses thereof for producing pesticides and controlling pests. Provided are recombinant entomopathogenic bacteria in which the promoter of the GXP synthase gene (gxpS gene) is replaced in the entomopathogenic bacteria with an arabinose inducible promoter using a promoter replacement technique. The recombinant entomopathogenic bacteria prepared in the present disclosure can produce large quantities of GXPs, which acts to suppress immunity of pests, by controlling the expression of the GXP synthetase gene (gxpS gene) through an addition of an inducer. The recombinant entomopathogenic bacteria prepared in the present disclosure can also effectively control pests through a response that suppresses the immunity of pests.