RNA Binding Protein Site Identification via Crosslinking and Structure Probing
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Solution Overview
Problem
Identifying precise nucleobases of RNA that hydrogen bond with proteins on a transcriptome-wide scale remains technically challenging due to the complexity of RNA-protein interactions and existing methods' limitations in specificity and sensitivity.
Innovation Solution
A method involving crosslinking RNA binding proteins to RNA fragments, detecting RNA-RBP complexes, isolating the RNA fragments, and profiling them using RNA structure probing reagents and high-throughput sequencing to identify nucleobases that interact with RNA binding proteins via hydrogen bonds, employing techniques like formaldehyde or UV crosslinking and immunoprecipitation with specific antibodies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crosslinking methods (formaldehyde, UV, psoralen) are used to capture RNA-protein interactions, then the detection sensitivity of RNA-RBP complexes is improved, but the specificity of identifying precise nucleobases involved in hydrogen bonding deteriorates due to crosslinking artifacts and background noise
Solution Approach 1:
The method segments the identification process into two independent parts: (1) crosslinking-based RNA-RBP complex capture to ensure sensitivity, and (2) structure probing-based nucleobase identification to ensure precision. By separating these functions, the patent avoids the trade-off where crosslinking artifacts compromise nucleobase identification accuracy.
Solution Approach 2:
RNA structure probing reagents act as intermediaries that indirectly identify hydrogen-bonding nucleobases without being affected by crosslinking artifacts. Instead of directly detecting crosslinked sites, the structure probing reagents probe RNA structure changes caused by protein binding, providing precise nucleobase identification independent of crosslinking methodology.
2Quantity of substance
If existing RNA-protein interaction methods are used, then the detection of RNA-RBP complexes is achieved, but the resolution to identify precise nucleobases involved in hydrogen bonding deteriorates due to method limitations
Solution Approach 1:
The patent merges two complementary methodologies: crosslinking-based immunoprecipitation for capturing RNA-RBP complexes and RNA structure probing for high-resolution nucleobase identification. This combination allows simultaneous achievement of complex detection quantity and nucleobase identification precision that neither method can achieve alone.
Solution Approach 2:
The method changes the detection parameter from direct crosslinking site detection to indirect structure probing detection. By monitoring changes in RNA structure parameters (reactivity to structure probing reagents) rather than direct crosslinking positions, the patent achieves higher nucleobase resolution while maintaining complex detection capability.
3Measurement precision
If comprehensive RNA structure probing is performed to identify all interacting nucleobases, then the measurement precision is improved, but the device complexity and procedural steps worsen due to multiple treatment conditions required
Solution Approach 1:
The patent performs preliminary crosslinking and immunoprecipitation to isolate specific RNA-RBP complexes before conducting structure probing. This preliminary enrichment step concentrates the signal from relevant nucleobases, allowing accurate identification with fewer probing conditions and reduced procedural complexity compared to genome-wide structure probing.
Solution Approach 2:
Instead of performing uniform structure probing across all RNA, the method applies structure probing specifically to immunoprecipitated RNA-RBP complexes. This localized approach concentrates resources on identifying nucleobases at actual protein binding sites, achieving high precision with reduced overall procedural complexity.
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
Enables precise identification of RNA nucleobases interacting with RNA binding proteins, enhancing the understanding of gene expression regulation by providing detailed insights into RNA-protein interactions at a nucleotide resolution, improving the detection of both abundant and less abundant RNA-protein complexes.
Implementation Method 1
the crosslinking comprises formaldehyde crosslinking
Implementation Method 2
the crosslinking comprises UV crosslinking
Implementation Method 3
the crosslinking comprises psoralen crosslinking
Implementation Method 4
the RNA nucleobase interacts with the RNA binding protein via hydrogen bond
Implementation Method 5
the detecting step further comprises contacting the RNA-RBP complex with an RBP specific antibody, and immunoprecipitating the RNA-RBP complex with the RBP specific antibody
Data Source
AI summary
Provided are methods for identifying an RNA nucleobase that interacts with an RNA binding protein (RBP) including (a) crosslinking the RNA binding protein to an RNA fragment in a biological sample; (b) detecting an RNA-RBP complex, wherein the RNA-RBP complex comprises the RNA fragment bound by the RNA binding protein; (c) isolating the RNA fragment of the RNA-RBP complex; and (d) profiling the isolated RNA fragment bound by the RNA binding protein, thereby identifying the RNA nucleobase of the RNA fragment that interacts with the RNA binding protein.