Identification of a New RXRα Antagonist Targeting the Coregulator-Binding Site.

Abstract:

:Retinoid X receptor-alpha (RXRα) is implicated in the regulation of many biological processes and also represents a unique intracellular target for pharmacologic interventions. Efforts on discovery of small molecules targeting RXRα have been primarily focused on the molecules that bind to its classical ligand-binding pocket (LBP). Here, we report the identification and characterization of a new RXRα transcriptional antagonist by using structure-based virtual screening. The new antagonist binds with submicromolar affinity to RXRα (Kd = 4.88 × 10-7 M) and selectively inhibits RXRα transactivation. The compound does not bind to the LBP but to a hydrophobic groove on the surface of RXRα. The new compound also effectively suppresses AKT activation and promotes apoptosis of cancer cells in a RXRα-dependent manner by inhibiting tRXRα interaction with the p85α subunit of PI3K. Thus, the compound represents a new RXRα modulator that regulates the nongenomic actions of RXRα by surface binding.

journal_name

ACS Med Chem Lett

authors

Chen F,Liu J,Huang M,Hu M,Su Y,Zhang XK

doi

10.1021/ml5000405

subject

Has Abstract

pub_date

2014-05-14 00:00:00

pages

736-741

issue

7

issn

1948-5875

journal_volume

5

pub_type

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