Source 1primary paper2025MED
Toolkit/QQPQ
QQPQ
Taxonomy: Mechanism Branch / Architecture. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
A crystal structure of the tetramer QQPQ with the parallel G4 formed by dTGGGTTGGGTTGGGTTGGGT shows two quinoline subunits interacting with an external G-quartet through c0-stacking, and solution nuclear magnetic resonance (NMR) confirms that the foldamer targets the 3' and 5' ends of this G4.
Usefulness & Problems
Why this is useful
QQPQ is a tetrameric mixed quinoline-pyridine foldamer used here as a structurally characterized G4 ligand. It binds a parallel G4 by c0-stacking on external quartets and targets both the 3' and 5' ends.; structural interrogation of foldamer-G4 recognition; end-stacking recognition of parallel G4 structures
Source:
QQPQ is a tetrameric mixed quinoline-pyridine foldamer used here as a structurally characterized G4 ligand. It binds a parallel G4 by c0-stacking on external quartets and targets both the 3' and 5' ends.
Source:
structural interrogation of foldamer-G4 recognition
Source:
end-stacking recognition of parallel G4 structures
Problem solved
QQPQ provides a concrete example of how this foldamer scaffold recognizes G4 DNA with a defined binding geometry. That helps explain the scaffold's conformational selectivity.; providing a defined foldamer example with structural and NMR-supported G4 binding mode
Source:
QQPQ provides a concrete example of how this foldamer scaffold recognizes G4 DNA with a defined binding geometry. That helps explain the scaffold's conformational selectivity.
Source:
providing a defined foldamer example with structural and NMR-supported G4 binding mode
Problem links
providing a defined foldamer example with structural and NMR-supported G4 binding mode
LiteratureQQPQ provides a concrete example of how this foldamer scaffold recognizes G4 DNA with a defined binding geometry. That helps explain the scaffold's conformational selectivity.
Source:
QQPQ provides a concrete example of how this foldamer scaffold recognizes G4 DNA with a defined binding geometry. That helps explain the scaffold's conformational selectivity.
Taxonomy & Function
Primary hierarchy
Mechanism Branch
Architecture: A reusable architecture pattern for arranging parts into an engineered system.
Mechanisms
conformational selectivity for parallel g-quadruplexesterminal g-quadruplex end-bindingπ-stacking with external g-quartetsTechniques
Structural CharacterizationTarget processes
No target processes tagged yet.
Input: Magnetic
Implementation Constraints
cofactor dependency: cofactor requirement unknownencoding mode: genetically encodedimplementation constraint: context specific validationoperating role: actuator
Its characterization in this paper required a defined parallel G4 sequence, crystallography, and solution NMR. Use as a structural probe depends on having sterically accessible G-quartet surfaces.; requires a parallel G4 target with accessible external G-quartets; binding mode evidence was established using crystallography and NMR
The abstract does not establish broader in-cell or in vivo utility for QQPQ. It also does not show performance across all G4 topologies.; evidence in the abstract is limited to binding mode on a specific parallel G4 example
Validation
Cell-freeBacteriaMammalianMouseHumanTherapeuticIndep. Replication
Supporting Sources
Ranked Claims
Mixed quinoline-pyridine aromatic oligoamide helical foldamers selectively bind G-quadruplexes and prefer parallel G4 structures, especially when external G-quartets are sterically accessible.
We found that the foldamers bind with 1:1 and 2:1 stoichiometries and prefer parallel G4 structures, especially when the external G-quartets are sterically accessible.
binding stoichiometry 1:1 and 2:1
Conformational selectivity of the foldamers arises from the bulkiness of oligomers with four or more subunits, which imposes steric restrictions on G4 binding, while pyridine-derived flexibility improves affinity.
The conformational selectivity of foldamers originates from the bulkiness of oligomers with four or more subunits, which imposes steric restrictions on G4 binding. The flexibility provided by the pyridine subunits was also key to improve affinity.
These foldamers can selectively target telomeric sequence variants containing adenine-to-thymine loop mutations.
Foldamers can also selectively target sequence variants of the telomeric sequences containing adenine-to-thymine mutation in the loops.
QQPQ binds a parallel G4 by having two quinoline subunits c0-stack with an external G-quartet, and NMR supports targeting of the 3' and 5' ends of the G4.
A crystal structure of the tetramer QQPQ with the parallel G4 formed by dTGGGTTGGGTTGGGTTGGGT shows two quinoline subunits interacting with an external G-quartet through c0-stacking, and solution nuclear magnetic resonance (NMR) confirms that the foldamer targets the 3' and 5' ends of this G4.
Approval Evidence
1 source1 linked approval claimfirst-pass slug qqpq
A crystal structure of the tetramer QQPQ with the parallel G4 formed by dTGGGTTGGGTTGGGTTGGGT shows two quinoline subunits interacting with an external G-quartet through c0-stacking, and solution nuclear magnetic resonance (NMR) confirms that the foldamer targets the 3' and 5' ends of this G4.
Source:
structural mechanismsupports
QQPQ binds a parallel G4 by having two quinoline subunits c0-stack with an external G-quartet, and NMR supports targeting of the 3' and 5' ends of the G4.
A crystal structure of the tetramer QQPQ with the parallel G4 formed by dTGGGTTGGGTTGGGTTGGGT shows two quinoline subunits interacting with an external G-quartet through c0-stacking, and solution nuclear magnetic resonance (NMR) confirms that the foldamer targets the 3' and 5' ends of this G4.
Source:
Comparisons
Source-stated alternatives
The web research summary notes QPQ, QPPQ, Q3, Q4, Q5, and Q8 as related foldamers in the study. Comparator ligands such as pyridostatin and 360A are mentioned in surrounding source discovery but not directly compared in the abstract.
Source:
The web research summary notes QPQ, QPPQ, Q3, Q4, Q5, and Q8 as related foldamers in the study. Comparator ligands such as pyridostatin and 360A are mentioned in surrounding source discovery but not directly compared in the abstract.
Source-backed strengths
supported by crystal structure; supported by solution NMR; binds external G-quartets through c0-stacking at both 3' and 5' ends
Source:
supported by crystal structure
Source:
supported by solution NMR
Source:
binds external G-quartets through c0-stacking at both 3' and 5' ends
Compared with anti-CD47 nanobody (CD47nb)
QQPQ and anti-CD47 nanobody (CD47nb) address a similar problem space.
Shared frame: same top-level item type; same primary input modality: magnetic
Compared with flexible plasmonic metasurface
QQPQ and flexible plasmonic metasurface address a similar problem space.
Shared frame: same top-level item type; same primary input modality: magnetic
QQPQ and split luminescent enzyme reconstituted by magnetic stimulus address a similar problem space.
Shared frame: same top-level item type; same primary input modality: magnetic
Ranked Citations
- 1.