PRESTO-Salsa GPCR Screening via Nucleic Acid Barcodes
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Solution Overview
Problem
The complexity of the gut microbiota metabolome poses challenges in understanding how microbial chemistries affect host physiology, and existing methods for screening G-protein coupled receptors (GPCRs) are limited in throughput and sensitivity, failing to capture the full range of bioactive microbiota metabolites produced by interactions between multiple microbial species, dietary compounds, and the host.
Innovation Solution
A high-throughput method, PRESTO-Salsa, is developed using nucleic acid barcodes linked to GPCR activation, allowing simultaneous screening of hundreds of GPCRs in a single tube, which involves cells expressing GPCR-fusion proteins and β-arrestin-TEV protease, enabling the identification of microbiota metabolites that activate specific receptors through next-generation sequencing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional GPCR screening methods are used, then individual receptors can be studied in detail, but the throughput is low and hundreds of GPCRs cannot be screened simultaneously
Solution Approach 1:
The patent segments the GPCR screening process by assigning unique nucleic acid barcodes to individual GPCRs and using protease-cleavable fusion proteins. This allows simultaneous screening of hundreds of GPCRs in a single tube while maintaining the ability to identify individual receptor activations through barcode sequencing, thereby resolving the contradiction between high throughput and system complexity.
Solution Approach 2:
The patent creates a universal screening system where a single assay platform can screen multiple GPCRs simultaneously using common reagents and detection methods. The barcode-based approach allows the same system to handle hundreds of different GPCRs without requiring separate optimized assays for each receptor, achieving multi-functionality that resolves the throughput-complexity tradeoff.
2Quantity of substance
If complex microbiota metabolite mixtures are analyzed, then the full range of bioactive metabolites can be identified, but the complexity creates challenges for dissecting microbial chemistries and their effects on host physiology
Solution Approach 1:
The patent extracts specific information from complex microbiota metabolite mixtures by using GPCR activation as a selection criterion. Instead of attempting to analyze all metabolites directly, the system extracts only those metabolites that activate specific GPCRs, effectively filtering the complex mixture through a biologically relevant lens that reduces analytical complexity while maintaining comprehensive detection capability.
Solution Approach 2:
The patent introduces GPCRs as intermediary elements between the complex microbiota metabolite mixture and the detection system. The GPCRs serve as mediators that translate complex chemical interactions into discrete, detectable signals through barcode transcription, simplifying the analysis of metabolite mixtures while preserving the full range of bioactive compound detection.
3Measurement precision
If existing screening methods are used, then current GPCR activations can be detected, but sensitivity is limited and novel microbiota metabolite-GPCR interactions are missed
Solution Approach 1:
The patent performs preliminary actions by fusing GPCRs to proteases and linking protease activation to barcode transcription before the actual screening occurs. This pre-established connection ensures that even weak or novel GPCR activations are captured with high sensitivity, as the barcode transcription is directly coupled to the activation event, preventing loss of information about novel metabolite-GPCR interactions.
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 enhances the sensitivity and throughput of GPCR screening, revealing novel microbiota metabolite-GPCR interactions and illuminating the bioactive microbiota metabolome, with potential to influence intestinal motility and systemic host physiology, and can be applied to diverse features of human physiology.
Implementation Method 1
a protease or a fragment thereof capable of cleaving the protease cleavage site within the first fusion protein
Implementation Method 2
a protein which activates transcription of a reporter gene in said cell
Data Source
AI summary
Methods of identifying test compounds or mixtures of test compounds from microbiota that bind to a fusion protein, such as a G-protein coupled receptor, are described. Also described are methods for high throughput screening of microbiota metabolites that are capable of activating G-protein coupled receptors.