PUBLICATION
Establishment of a graphene quantum dot (GQD) based steroid binding assay for the nuclear progesterone receptor (pgr)
- Authors
- Hossain, M.F., Hossain, S., Sarwar Jyoti, M.M., Omori, Y., Ahamed, S., Tokumoto, T.
- ID
- ZDB-PUB-240404-20
- Date
- 2024
- Source
- Biochemistry and biophysics reports 38: 101691101691 (Journal)
- Registered Authors
- Tokumoto, Toshinobu
- Keywords
- FRET, Graphene quantum dots, Nuclear progesterone receptor, Progesterone, Steroids
- MeSH Terms
- none
- PubMed
- 38571552 Full text @ Biochem Biophys Rep
Citation
Hossain, M.F., Hossain, S., Sarwar Jyoti, M.M., Omori, Y., Ahamed, S., Tokumoto, T. (2024) Establishment of a graphene quantum dot (GQD) based steroid binding assay for the nuclear progesterone receptor (pgr). Biochemistry and biophysics reports. 38:101691101691.
Abstract
Previously, we established a homogeneous assay for membrane progesterone receptor alpha (mPRα) ligands by conjugating semiconductor nanoparticles known as graphene quantum dots (GQDs) to mPRα. When mixed with a progesterone-BSA-fluorescein isothiocyanate conjugate (P4-BSA-FITC), fluorescence occurred by fluorescence resonance energy transfer (FRET) but was reduced by the ligand-receptor binding activity. The established way showed ligand specificity as mPRα protein. In this study, we tried to establish the same way for nuclear progesterone receptor (Pgr). The ligand-binding domain (LBD) of zebrafish Pgr (zPgrLBD) was expressed as a fusion protein with glutathione S-transferase (GST) (GST-zPgrLBD). The recombinant protein was then purified and coupled with GQDs to produce GQD-conjugated GST-zPgrLBD (GQD-GST-zPgrLBD). When mixed with a P4-BSA-FITC and activated by 370 nm light, fluorescence at 520 nm appeared by FRET mechanism. Fluorescence at 520 nm was reduced by adding free progesterone to the reaction mixture. Reduction of fluorescence was induced by zPgr ligands but not by steroids or chemicals that do not interact with zPgr. The results showed the formation of a complex of GQD-GST-zPgrLBD and P4-BSA-FITC with ligand-receptor binding. The binding of the compounds was further confirmed by a radiolabeled steroid binding assay. A homogenous ligand-binding assay for nuclear progesterone receptor has been established.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping