Phosphine Sulfide Cu(I) Chelators With Sub-Femtomolar Affinity
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Solution Overview
Problem
Existing synthetic Cu(I) chelators struggle to achieve dissociation constants below 1 fM and exhibit limited redox stability, leading to challenges in stabilizing cellular copper levels and treating copper-related diseases.
Innovation Solution
Development of novel copper chelators represented by Formulas I-VII, which include aromatic and aliphatic systems with specific substituents, capable of forming stable Cu(I) complexes with high affinity and redox stability, and methods for their use in chelating, quantifying, and delivering copper in biological systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synthetic Cu(I) chelators based on thioether donors are used, then Cu(I) coordination ability is achieved, but dissociation constants are challenging to realize (below 1 fM)
Solution Approach 1:
The patent changes the chemical parameters of the chelator by introducing phosphine sulfide moieties with specific electron-withdrawing groups (nitro, cyano, or carbonyl) at positions 2 and/or 4 of the phosphine sulfide ring. This modifies the electronic properties to enhance Cu(I) affinity while maintaining redox stability, achieving dissociation constants below 1 fM as demonstrated with ligands PSP-1 and PSP-2.
Solution Approach 2:
The patent creates composite chelator structures combining phosphine sulfide core with electron-withdrawing auxiliary groups. The composite nature of these ligands (phosphine sulfide backbone plus functional groups) provides both strong Cu(I) binding and protection against protonation and oxidation, resolving the contradiction between coordination ability and stability.
2Manufacturing precision
If aliphatic phosphine-based ligands with auxiliary phosphine sulfide moieties are used, then dissociation constants are improved, but redox stability is limited
Solution Approach 1:
The patent applies local quality by placing electron-withdrawing groups specifically at positions 2 and/or 4 of the phosphine sulfide ring system. This localized modification creates different electronic environments: the phosphine sulfide core maintains Cu(I) affinity while the auxiliary groups provide redox stability and protect against oxidation, simultaneously improving both dissociation constant and redox stability.
3Reliability
If Cu(I) chelators with high affinity are used, then copper levels are reduced, but interference from other metal ions occurs
Solution Approach 1:
The patent modifies the chelator's selectivity parameters by incorporating specific electron-withdrawing groups (nitro, cyano, carbonyl) that create a unique electronic environment favorable for Cu(I) binding. The combination of phosphine sulfide core with these auxiliary groups creates a chelator that maintains high Cu(I) affinity while being resistant to interference from other metal ions like Mn(II), Fe(II), and Zn(II), as demonstrated in the patent examples.
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 novel copper chelators effectively stabilize cellular copper levels, reduce copper-related diseases, and enable precise copper quantification and delivery, demonstrating significant anti-angiogenic and anti-tumorigenic effects.
Implementation Method 1
These first-generation phosphine sulfide-stabilized phosphines, typified by PSP-1 and PSP-2 (FIG. 1A and FIG. 1), maintain strong Cu(I) coordinating ability
Implementation Method 2
These first-generation phosphine sulfide-stabilized phosphines... exert an electron withdrawing effect on the phosphine sites, stabilizing the free ligand against protonation and oxidation
Implementation Method 3
Copper chelators and methods of their use are provided... effectively chelate Cu(I), reducing labile copper levels
Data Source
AI summary
Several dimethylphosphine sulfide- and phosphine-containing compounds have been discovered that chelate copper(I) with high affinity. In certain embodiments, the compounds can be used to quantify copper(I) in complex biological systems. In another embodiment, the compounds can be used for the treatment of copper(I)-related illnesses and conditions. In still other embodiments, the compounds are ratiometric probes.