Chimeric Receptor Polypeptide for Precise Gene Expression Control
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Solution Overview
Problem
Current conditional gene expression systems suffer from imprecise control, insufficient induction levels, and lack of specificity, limiting their ability to precisely regulate gene expression in response to stimuli.
Innovation Solution
A system comprising a chimeric receptor polypeptide that undergoes conformational or chemical modification upon ligand binding, a chimeric adaptor polypeptide that binds to the receptor-modified polypeptide, and a gene modulating polypeptide with an actuator moiety linked to a cleavage recognition site, where the cleavage by a cleavage moiety activates the actuator to regulate target polynucleotide expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current conditional gene expression systems are used, then gene expression can be regulated in response to stimuli, but the control is imprecise and induction levels are insufficient
Solution Approach 1:
The system divides the gene expression control mechanism into separate functional modules: a chimeric receptor polypeptide that senses the stimulus, a cleavage moiety that processes the signal, and a gene modulating polypeptide that executes the gene regulation. This segmentation allows each component to be optimized independently, improving both control precision and induction level.
Solution Approach 2:
The invention introduces a cleavage recognition site as an intermediary element between the receptor and the gene modulating polypeptide. When the receptor undergoes conformational change upon ligand binding, it activates the cleavage moiety to cleave the recognition site, which then releases the gene modulating polypeptide to regulate target gene expression. This intermediary mechanism enhances both the precision of control and the level of induction.
2Reliability
If current conditional gene expression systems are used, then some gene regulation is achieved, but specificity is lacking
Solution Approach 1:
The chimeric adaptor polypeptide contains a specific receptor binding moiety that is tailored to bind only to the modified chimeric receptor polypeptide. This local specialization ensures that the gene modulating polypeptide is activated only in response to the specific stimulus detected by the receptor, thereby enhancing specificity without requiring complex system-wide changes.
Solution Approach 2:
The system is pre-configured with the chimeric receptor polypeptide, cleavage moiety, and gene modulating polypeptide in a controlled assembly where the gene modulating polypeptide is initially held in an inactive state by the cleavage recognition site. This preliminary arrangement ensures that gene regulation occurs only after the specific stimulus triggers the conformational change and subsequent cleavage event, improving specificity while maintaining manageable system complexity.
3Ease of operation
If the chimeric receptor undergoes conformational change upon ligand binding, then signal transduction is activated, but the activation of gene expression is not sufficient
Solution Approach 1:
The system employs a dynamic cascade mechanism where the initial conformational change of the chimeric receptor upon ligand binding triggers a series of amplification events: activation of the cleavage moiety, cleavage of the recognition site, release of the gene modulating polypeptide, and subsequent binding to the target gene. This dynamic progression transforms a subtle conformational change into a robust gene induction response, enhancing productivity while maintaining ease of operation.
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 system enables precise and specific regulation of gene expression by leveraging receptor modifications to activate the actuator moiety, enhancing the control and specificity of gene induction and deactivation in response to stimuli.
Implementation Method 1
a chimeric receptor polypeptide that undergoes a conformational change upon binding to a ligand for the GPCR
Implementation Method 2
a cleavage moiety that cleaves the cleavage recognition site when in proximity to the cleavage recognition site
Data Source
AI summary
The present disclosure provides systems, compositions and methods for regulating expression of a target polynucleotide in a cell. The systems, compositions and methods comprise a chimeric receptor polypeptide comprising a G-protein coupled receptor (GPCR) or a fragment thereof, a chimeric adaptor polypeptide, at least one actuator moiety and a cleavage moiety.