Selectivity of a thiosemicarbazonatocopper(ii) complex towards duplex RNA. Relevant noncovalent interactions both in...

Area of Science:

• Coordination Chemistry
• Medicinal Chemistry
• Biophysical Chemistry

Background:

• Thiosemicarbazones and metal complexes are investigated for antitumor properties.
• Previous studies focused on their DNA interactions.

Purpose of the Study:

• Synthesize and characterize novel copper(II) thiosemicarbazone complexes with nucleobases and nucleotides.
• Investigate the interaction of these complexes with RNA for potential therapeutic applications.

Main Methods:

• Synthesis and characterization of copper(II) thiosemicarbazone complexes.
• X-ray crystallography for structural determination.
• Spectroscopic and computational studies to analyze binding interactions.
• RNA binding affinity studies.

Main Results:

• Crystal structures of adenine- and 9-methylguanine-containing complexes were determined.
• First reported study on thiosemicarbazone-RNA affinity.
• [CuL(OH2)]+ complexes intercalate into dsRNA poly(rA)·poly(rU) via hydrogen bonds and π-π stacking.
• Noncovalent interactions observed in solid state and solution.

Conclusions:

• The copper(II) thiosemicarbazone complexes exhibit selective binding to RNA.
• This selective RNA interaction differs from DNA binding, suggesting potential for targeted medical applications.
• Further research into these complexes could lead to novel RNA-based therapeutics.