Triostin A derived hybrid for simultaneous DNA binding and metal coordination

Area of Science:

• Medicinal Chemistry
• Molecular Biology
• Supramolecular Chemistry

Background:

• The natural product triostin A exhibits antibiotic properties via specific DNA recognition, utilizing a bicyclic depsipeptide scaffold for bisintercalation.
• Modification of triostin A by replacing quinoxaline moieties with nucleobases creates analogs capable of binding to the DNA major groove.

Purpose of the Study:

• To develop a hybrid molecule with both DNA binding and metal coordinating capabilities.
• To investigate the non-covalent proximity of transition metal ions to double-stranded DNA (dsDNA).
• To synthesize and characterize a nucleobase-modified triostin A analog functionalized with a metal-binding ligand.

Main Methods:

• Synthesis of a nucleobase-modified triostin A analog incorporating propargylglycine for subsequent click-chemistry attachment.
• Design and synthesis of a bridging phenol ligand connecting two [1,4,7]triazacyclononane rings.
• Confirmation of binuclear zinc complex formation using high-resolution mass spectrometry for both the ligand and the hybrid molecule.

Main Results:

• Successful synthesis of the triostin A analog and the metal-binding ligand.
• Formation of a binuclear zinc complex with the hybrid molecule was confirmed by mass spectrometry.
• Both the metal complex and the hybrid molecule demonstrated dsDNA stabilization, indicating independent metal complexation and DNA binding.

Conclusions:

• A novel hybrid molecule integrating DNA binding and metal coordination functionalities has been successfully synthesized.
• The developed hybrid molecule effectively stabilizes dsDNA.
• Metal complexation and DNA binding are shown to be independent processes in this system.