An enzymatically-sensitized sequential and concentric energy transfer relay self-assembled around semiconductor...

Area of Science:

• Nanotechnology
• Biophysics
• Materials Science

Background:

• Controlling light energy in nanoscale devices is crucial for their development and application.
• Existing methods often lack a stand-alone modality for light generation, propagation, and defined emission wavelengths.

Purpose of the Study:

• To design and characterize macromolecular nanoassemblies capable of controlled, sequential energy transfer for light manipulation.
• To demonstrate the use of quantum dots (QDs), luciferase, and dye-labeled peptides in creating functional nanoscale devices.

Main Methods:

• Self-assembly of luciferase and peptides around QDs using polyhistidine tags and metal-affinity coordination.
• Activation via coelenterazine H substrate, initiating bioluminescence resonance energy transfer (BRET).
• Sequential energy transfer through Förster resonance energy transfer (FRET) to multiple dye acceptors (Alexa Fluor 700, Cy5.5).

Main Results:

• Demonstrated a multi-step energy transfer cascade (BRET-FRET-FRET) within the nanoassemblies.
• Quantum dots served as central scaffolds, energy harvesters, and transfer relays.
• Transfer efficiencies were analyzed and found to be controllable by the number of enzymes/peptides.

Conclusions:

• The developed nanoassemblies offer a platform for controlled light energy management at the nanoscale.
• The modular design allows for tuning energy transfer efficiencies for potential applications in sensing and optoelectronics.
• Further optimization holds promise for advanced, integrated nanoscale optical devices.