Inhibition of DNA transcription using cationic mixed monolayer protected gold clusters

Area of Science:

• Biochemistry
• Nanotechnology
• Molecular Biology

Background:

• Efficient DNA recognition is crucial for developing biological effectors like transcription regulators and DNA sensors.
• Existing methods for DNA interaction often face challenges in creating stable and controllable assemblies.

Purpose of the Study:

• To create a novel scaffold for multivalent DNA interactions using functionalized gold clusters.
• To investigate the binding characteristics and functional consequences of these DNA-gold cluster assemblies.

Main Methods:

• Fabrication of mixed monolayer protected gold clusters (MMPCs) functionalized with tetraalkylammonium ligands.
• Characterization of MMPCs-DNA assembly using binding studies.
• In vitro transcription inhibition assays using T7 RNA polymerase.

Main Results:

• MMPCs functionalized with tetraalkylammonium ligands effectively bind to the DNA backbone through charge complementarity.
• The resulting MMPCs-DNA assemblies are charge-neutralized and nonaggregated.
• These highly efficient interactions completely inhibit transcription by T7 RNA polymerase.

Conclusions:

• Functionalized MMPCs provide an effective scaffold for controlled DNA interaction.
• The developed system demonstrates potent inhibition of transcription, highlighting its potential as a biological effector.
• This work advances the development of DNA-sensing and gene regulation technologies.