Kinetic Analysis of Estrogen Receptor/Ligand Interactions

Surface plasmon resonance biosensor technology was used to directly measure the binding interactions of small molecules to the ligand-binding domain of human estrogen receptor. In a screening mode, specific ligands of the receptor were easily discerned from nonligands. In a high-resolution mode, the...

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Published inProceedings of the National Academy of Sciences - PNAS Vol. 99; no. 13; pp. 8562 - 8567
Main Authors Rich, Rebecca L., Hoth, Lise R., Geoghegan, Kieran F., Brown, Thomas A., LeMotte, Peter K., Simons, Samuel P., Hensley, Preston, Myszka, David G.
Format Journal Article
LanguageEnglish
Published United States National Academy of Sciences 25.06.2002
National Acad Sciences
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Summary:Surface plasmon resonance biosensor technology was used to directly measure the binding interactions of small molecules to the ligand-binding domain of human estrogen receptor. In a screening mode, specific ligands of the receptor were easily discerned from nonligands. In a high-resolution mode, the association and dissociation phase binding responses were shown to be reproducible and could be fit globally to a simple interaction model to extract reaction rate constants. On average, antagonist ligands (such as tamoxifen and nafoxidine) were observed to bind to the receptor with association rates that were 500-fold slower than agonists (such as estriol and β-estradiol). This finding is consistent with these antagonists binding to an altered conformation of the receptor. The biosensor assay also could identify subtle differences in how the same ligand interacted with two different isoforms of the receptor (α and β). The biosensor's ability to determine kinetic rate constants for small molecule/protein interactions provides unique opportunities to understand the mechanisms associated with complex formation as well as new information to drive the optimization of drug candidates.
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Communicated by Pamela J. Bjorkman, California Institute of Technology, Pasadena, CA
To whom reprint requests should be addressed at: Center for Biomolecular Interaction Analysis, School of Medicine 4A417, 50 North Medical Drive, Salt Lake City, UT. E-mail: dmyszka@cores.utah.edu.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.142288199