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Published on: August 22, 2014
Gold nanoparticles functionalized with peptides for specific affinity aggregation assays of estrogen receptors and
Yoshiyuki Takatsuji1, Shinya Ikeno, Tetsuya Haruyama
1Department of Biological Functions and Engineering, Kyushu Institute of Technology, Kitakyushu Science and Research Park, Kitakyushu, Fukuoka, Japan. takatsuji-yoshiyuki@edu.life.kyutech.ac.jp
Abstract:
Nuclear receptors regulate the transcription of genes and various functions such as development, differentiation, homeostasis, and behavior by formation of complexes with ligand and co-activator. Recent findings have shown that agonists of a ligand may have a toxic effect on cellular/tissular function through improper activation of nuclear receptors. In this study, a simple assay system of hetero-complexes of three different molecules (estrogen receptor, ligand, and co-activator peptide) has been developed. This assay system employs functionalized gold nanoparticles (GNPs: 15 nm in diameter). The surfaces of the GNPs were modified by a 12- or 20-amino-acid peptide that contains the sequence of co-activator for activating nuclear receptor by an agonist ligand. Owing to the affinity of the peptide, the functionalized GNPs aggregate faster when the nuclear receptor and the agonist ligand are also present. The aggregation of GNPs can be identified by shifts in adsorption spectrum, which give information about the specificity of agonist ligands. Similarly, this spectrum shift can measure concentration of known agonist ligand. This simple agonist screening will be employed as high through-put analysis (HTA) in the discovery of drugs that act through nuclear receptors.
Insights
A novel assay uses functionalized gold nanoparticles to detect nuclear receptor activity. This method enables rapid screening of potential drug compounds, identifying specific agonist ligands and their concentrations.
Area of Science:
- Biochemistry
- Nanotechnology
- Molecular Biology
Background:
- Nuclear receptors regulate gene transcription and cellular functions through ligand-coactivator complexes.
- Agonist ligands can induce toxic effects via aberrant nuclear receptor activation.
- Developing precise screening methods for nuclear receptor modulators is crucial for drug discovery.
Purpose of the Study:
- To develop a simple, functional assay for detecting hetero-complexes of nuclear receptors, ligands, and co-activators.
- To utilize functionalized gold nanoparticles (GNPs) for a novel agonist screening platform.
- To establish a high-throughput analysis method for identifying drugs targeting nuclear receptors.
Main Methods:
- Functionalized gold nanoparticles (15 nm diameter) were modified with co-activator peptides.
- The assay relies on GNP aggregation triggered by the formation of receptor-ligand-coactivator complexes.
- Aggregation was detected via shifts in adsorption spectra, indicating ligand specificity and concentration.
Main Results:
- The functionalized GNPs aggregated specifically in the presence of nuclear receptors and agonist ligands.
- Adsorption spectrum shifts provided quantifiable information on ligand specificity.
- The assay demonstrated the ability to measure the concentration of known agonist ligands.
Conclusions:
- A straightforward GNP-based assay system for nuclear receptor hetero-complexes has been successfully developed.
- This assay enables specific detection and quantification of agonist ligands.
- The system is suitable for high-throughput analysis in drug discovery targeting nuclear receptors.
