RNA-Protein Interaction Mapping with Covalent Capture and Denaturing Washes
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Solution Overview
Problem
Conventional methods for detecting RNA-protein interactions, such as CLIP and RIP, struggle to differentiate between bona fide interactions that occur in vivo and those that form in solution, leading to false positives, especially when studying RNA binding proteins that bind few targets or low-level RNA transcripts.
Innovation Solution
The Covalent Linkage and Affinity Purification (CLAP) method uses genetic tagging of proteins with covalent epitope tags, allowing covalent capture on affinity resins and denaturing washes to specifically purify and map RNA-protein interactions, distinguishing in vivo from in vitro associations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods (CLIP/RIP) are used to detect RNA-protein interactions, then interaction detection is achieved, but false positives increase due to inability to differentiate in vivo from in vitro associations
Solution Approach 1:
The patent applies parameter changes by transitioning from native conditions to denaturing conditions during the wash step. This fundamental parameter change (from physiological to denaturing environment) allows differentiation between covalently crosslinked in vivo interactions and non-covalent in vitro associations, thereby improving measurement precision and reducing false positives
Solution Approach 2:
The patent introduces crosslinking agents as intermediaries that mediate between the query protein and target RNA. These crosslinking agents form covalent bonds that stabilize in vivo interactions, serving as a mediator that allows subsequent denaturing washes to remove non-specific bindings while preserving true interactions
2Reliability
If denaturing washes are applied to remove spurious interactions, then false positives are reduced, but bona fide interactions may be lost
Solution Approach 1:
The patent applies preliminary action by performing crosslinking before the denaturing wash step. This preliminary crosslinking action creates covalent bonds that protect true RNA-protein interactions from being disrupted by subsequent denaturing conditions, thereby preventing loss of bona fide interactions while allowing removal of false positives
Solution Approach 2:
The patent applies preliminary anti-action by using crosslinking agents to prevent the disruption of true interactions during denaturing washes. The crosslinking creates a protective covalent linkage that counteracts the denaturing effect, ensuring that genuine interactions are preserved while non-specific bindings are eliminated
3Measurement precision
If covalent tagging and affinity purification are used, then specificity of interaction mapping is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by using a standardized covalent tag system that can be attached to various query proteins. This universal tagging approach, combined with a common affinity resin, provides a multi-functional platform that simplifies the overall process despite the added specificity, as the same tag-resin system can be used across different protein targets
Solution Approach 2:
The patent introduces covalent tags as intermediaries that mediate between the query protein and the affinity resin. These tags serve as specific recognition elements that enable high-specificity purification while maintaining a relatively simple workflow, as the tag-resin interaction is highly specific and does not require complex purification conditions
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
CLAP effectively removes spurious RNA-protein interactions that occur in solution while retaining bona fide interactions, providing a framework for accurate RNA-protein mapping and identifying true binding sites.
Implementation Method 1
applying a crosslinking agent or force to the query protein and the composition, thus crosslinking the query protein to the target moiety associated therewith
Implementation Method 2
covalently binding the tag to a substrate, thus covalently immobilizing the query protein and crosslinked target moiety on the substrate
Implementation Method 3
washing the immobilized query protein and crosslinked target moiety under denaturing conditions, in which the query protein remains immobilized on the substrate
Data Source
AI summary
In some embodiments, methods of detecting an association between a query protein and a target moiety are described. In some embodiments, compositions are described. In some embodiments, kits are described.