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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Interfacing Nanomaterials with Biology through Ligand Engineering.

Aarohi Gupta1, William Ndugire1, Cristina-Maria Hirschbiegel1

  • 1Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, Massachusetts 01003, United States.

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Engineered gold nanoparticles (AuNPs) with precisely designed ligands offer a modular and non-toxic platform for nanomedicine. Ligand structure dictates AuNP interactions, enabling diverse biomedical applications like drug delivery and biosensing.

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Area of Science:

  • Nanomaterials Science
  • Biomedical Engineering
  • Organic Chemistry

Background:

  • Gold nanoparticles (AuNPs) are versatile nanomaterials with significant potential in biology and biomedicine.
  • Ligand engineering is crucial for controlling AuNP properties like size, dispersity, stability, and biological interactions.
  • Understanding AuNP-biomolecule interactions is key to developing safe and effective nanomedical applications.

Purpose of the Study:

  • To investigate the design principles of ligands for creating non-toxic, modular, and functional gold nanoparticles (AuNPs) for biological environments.
  • To explore the impact of ligand structure on AuNP-biomolecule interactions and cellular behavior.
  • To demonstrate the translation of engineered AuNPs into various nanomedicine applications.

Main Methods:

  • Synthesis of spherical AuNPs with varying sizes and ligand structures.
  • Empirical exploration of AuNP-biomolecule interactions.
  • Development of ligands with distinct structural segments (hydrophobic interior, hydrophilic spacer, functional headgroup).
  • Investigation of ligand hydrophobicity and charge effects on NP uptake and toxicity.
  • Integration of synthetic capabilities for constructing AuNPs for specific biomedical applications.

Main Results:

  • Engineered ligands with a three-segment structure (hydrophobic core, tetra(ethylene glycol) spacer, functional headgroup) were developed.
  • Ligand design was shown to control AuNP stability, dispersity, and interactions with biological systems.
  • Ligand hydrophobicity and charge significantly influence AuNP cellular uptake and toxicity.
  • Multivalent AuNP constructs with unique properties were fabricated through ligand engineering.

Conclusions:

  • Ligand design is a pivotal factor in transforming gold nanoparticles (AuNPs) into functional nanoplatforms for nanomedicine.
  • Engineered AuNPs can be tailored to be non-toxic, modular, and functional in biological settings.
  • The principles of ligand engineering for AuNPs are translatable to other nanoparticle systems, advancing nanomedicine applications.