TASQ Compounds for G-Quadruplex Purification
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Solution Overview
Problem
Current compounds like BioTASQ have decreased quadruplex-affinity due to intramolecular interactions, making them less effective for purifying G4-DNA and G4-RNA, and they face challenges in bioavailability for in vivo use.
Innovation Solution
Development of novel TASQ compounds with a specific formula that includes a metallic cation for optical imaging and bioorthogonal reaction capabilities, enhancing affinity for G-quadruplex structures and versatility for both in vitro and in vivo applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If BioTASQ compound is used to purify G4-RNA, then purification capability is achieved, but quadruplex-affinity is decreased due to intramolecular interaction between biotin tag and guanine
Solution Approach 1:
The compound is divided into separate functional modules: the TASQ core structure that binds to G-quadruplex and the biotin tag for purification, connected by a flexible linker. This segmentation prevents intramolecular interaction between biotin and guanine while maintaining both purification capability and quadruplex affinity independently.
Solution Approach 2:
A PEG linker acts as an intermediary component between the TASQ core and biotin tag, providing physical separation and flexibility that prevents harmful intramolecular interactions while maintaining the functional integrity of both the G4-binding moiety and the purification handle.
2Reliability
If multivalent TASQ compounds are designed to increase affinity, then target engagement is improved, but bioavailability and in vivo usability are reduced
Solution Approach 1:
The compound design optimizes molecular weight, charge distribution, and hydrophilicity parameters by selecting specific alkyl chain lengths and compositions in the linker regions, balancing high affinity for G-quadruplex with improved cellular permeability and metabolic stability required for in vivo applications.
Solution Approach 2:
Different regions of the molecule have optimized properties: the core TASQ structure provides high affinity through specific G4 interaction, while the linker regions provide flexibility and appropriate hydrophilicity, and terminal groups provide solubility and metabolic stability, creating local optimization throughout the molecule.
3Adaptability or versatility
If biotin tag is added for purification purposes, then purification functionality is enabled, but quadruplex-affinity is decreased
Solution Approach 1:
The molecule is segmented into distinct functional domains with the TASQ core responsible for G4 binding and the biotin moiety responsible for purification, separated by a linker that prevents interference between these functions and eliminates affinity reduction caused by intramolecular interactions.
Solution Approach 2:
The biotin tag extends the functionality into a different dimension (purification capability) without compromising the primary binding function, achieved through spatial separation via the linker that prevents the purification handle from interfering with the binding interface.
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
The new TASQ compounds demonstrate high affinity for G-quadruplex structures, improved bioavailability, and ease of functional residue substitution, allowing for effective identification and purification of G4-DNA and G4-RNA, with enhanced stability and imaging capabilities.
Implementation Method 1
A is absent or is a metallic cation, in particular a lanthanide used for optical imaging, in particular Eu3+, Tb3+, Dy3+, or Yb3+
Implementation Method 2
A is absent or is a metallic cation, in particular a lanthanide used for optical imaging
Implementation Method 3
G-quadruplexes (G4s) are structures formed by Hoogsteen bonding of four guanines to form planar guanine quartet (G-quartet) units
Implementation Method 4
which π-stack on each other, to assemble into columnar four-stranded structures with the central cavity stabilized by monovalent cations (i.e., K+, Na+)
Data Source
AI summary
A compound of formula I:wherein A is present or absent; X1, X2, X3 and X4 are, independently from each other, an alkyl;Y1, Y2, Y3 and Y4 are independently from each other a C1-C10 alkyl, -Z1, Z2, Z3 and Z4 are independently from each other a C1-C5 linear alkyl; R1 is a group allowing to carry out bioorthogonal reactions; and R2 is group including a N.