Janus Divalent Nucleobases for RNA Secondary Structure Binding
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Solution Overview
Problem
Current methods for targeting and manipulating RNA sequences are limited by their stability and specificity, particularly in binding to mismatched or secondary structures, which are crucial for gene regulation and therapeutic applications.
Innovation Solution
Development of 'Janus' nucleobases that can form directional hydrogen bonding interactions with both strands of DNA or RNA double helices, integrated into a γPNA backbone for enhanced binding capabilities and sequence specificity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional nucleobases are used for binding to DNA or RNA, then binding to canonical base-pairs is achieved, but binding to mismatched or secondary structures is insufficient
Solution Approach 1:
The nucleobase is divided into two independent binding faces, each capable of forming hydrogen bonds with complementary bases on opposite strands. This segmentation allows the single nucleobase to simultaneously recognize and bind to both strands, including mismatched configurations, thereby resolving the contradiction between specific binding and adaptability to various structures.
Solution Approach 2:
The divalent nucleobase is designed to perform multiple binding functions: it can bind to canonical Watson-Crick base-pairs, mismatched base-pairs, and various secondary structures (hairpins, bulges, junctions) in RNA. This multi-functionality enables a single molecular tool to address diverse binding scenarios, improving both reliability and versatility simultaneously.
2Adaptability or versatility
If molecules are designed to bind sequence-specifically to control genetic information flow, then therapeutic and diagnostic applications are enabled, but the complexity of designing and synthesizing such molecules increases
Solution Approach 1:
The invention changes the fundamental parameter of nucleobase valency from monovalent to divalent, creating a new class of nucleobases that bind to two strands simultaneously. This parameter change simplifies the design process compared to traditional multi-component systems, as the divalent nucleobase inherently provides sequence-specific binding through its dual hydrogen-bonding capability, reducing the need for complex assembly steps.
3Reliability
If RNA secondary structures are targeted for therapeutic intervention, then gene regulation is achieved, but the stability and accessibility of RNA structures for binding is reduced
Solution Approach 1:
The divalent nucleobase acts as an intermediary that can penetrate and bind to stable RNA secondary structures. By forming hydrogen bonds with bases in hairpins, bulges, and junctions, the divalent nucleobase serves as a mediator that stabilizes the binding interaction and enables therapeutic intervention in otherwise stable and inaccessible RNA structures.
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 selective binding to double-stranded nucleic acid sequences, including mismatched and secondary structures, improving gene regulation and providing therapeutic and diagnostic tools for genetic diseases and infections.
Implementation Method 1
Janus nucleobases are capable of forming directional hydrogen bonding interactions with both strands of the DNA and/or RNA double helix
Data Source
AI summary
Described herein are novel divalent nucleobases that each bind two nucleic acid strands, matched or mismatched when incorporated into a nucleic acid or nucleic acid analog backbone (a genetic recognition reagent, or genetic recognition reagent). In one embodiment, the genetic recognition reagent is a peptide nucleic acid (PNA) or gamma PNA (γPNA) oligomer. Uses of the divalent nucleobases and monomers and genetic recognition reagents containing the divalent nucleobases also are provided.