The interface makes a difference: lanthanide ion coated vesicles hydrolyze phosphodiesters

Area of Science:

• Biochemistry
• Supramolecular Chemistry
• Materials Science

Background:

• Lanthanide ions exhibit strong Lewis acidity, which can be modulated by complexation with ligands.
• This Lewis acidity enables the hydrolysis of phosphoesters and DNA.
• Understanding the interaction of metal ions with lipid membranes is crucial for various biological and chemical processes.

Purpose of the Study:

• To investigate the interaction between lanthanide ions and phosphatidylcholine lipid vesicles.
• To explore the formation of supramolecular structures and their impact on Lewis acidity.
• To determine the effect of these structures on the hydrolysis rates of phosphodiesters.

Main Methods:

• Complexation studies of lanthanide ions with zwitterionic phosphatidylcholine lipids.
• Characterization of the resulting supramolecular structures.
• Assays to measure the hydrolysis rates of phosphodiesters.

Main Results:

• Lanthanide ions interact with phosphatidylcholine vesicles to form supramolecular assemblies.
• Metal ions are loosely coordinated to the vesicle surface in these structures.
• The assembled structures present a high density of Lewis-acidic lanthanide centers.
• Enhanced hydrolysis rates of phosphodiesters were observed with these assemblies.

Conclusions:

• Lanthanide-lipid vesicle interactions yield functional supramolecular structures.
• These structures significantly enhance the catalytic activity of lanthanide ions towards phosphodiester hydrolysis.
• This work highlights a novel approach for designing efficient Lewis acid catalysts based on supramolecular assembly.