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Updated: Feb 22, 2026

Biochemical Reconstitution of Steroid Receptor•Hsp90 Protein Complexes and Reactivation of Ligand Binding
Published on: September 21, 2011
Steroid receptor coactivators: from basic research to translational opportunities
Yosef Gilad1, Sang Jun Han1,2, David M Lonard1,2
1Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA.
Abstract:
The concept of nuclear receptor (NR) coregulation was proposed nearly 2 decades before it was experimentally validated. According to this model, NRs-executors of a vast array of transcriptional programs-do not act independently but are governed by a network of regulatory proteins that either activate or repress their biological function. Nuclear receptors identify the genes to be regulated. However, coregulators ultimately serve as the true controllers of transcriptional outcomes. They recruit cofactors and coordinate the activity of transcriptional complexes, thereby shaping NR-mediated gene expression beyond NRs' intrinsic functionality. The steroid receptor coactivator (SRC) family is the most extensively studied and functionally dominant group of NR coregulators, modulating nearly all gene activities. The pleiotropic biological roles of SRCs-spanning key physiological and pathological processes-make them compelling therapeutic targets. Here, we outline the evolution of the coregulation concept, which reached a critical milestone with the discovery of the SRC family. We highlight the central roles of SRCs in both physiology and oncology and trace the development of therapeutic strategies aimed at targeting these proteins.
Insights
Nuclear receptors (NRs) are regulated by coregulators, not independent. The Steroid Receptor Coactivator (SRC) family, key regulators of NR function, are crucial therapeutic targets in physiology and oncology.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Nuclear receptors (NRs) control gene expression but require coregulators.
- Coregulators modulate NR activity, acting as key controllers of transcription.
- The Steroid Receptor Coactivator (SRC) family is a dominant group of NR coregulators.
Purpose of the Study:
- To outline the evolution of the nuclear receptor coregulation concept.
- To highlight the central roles of SRCs in physiology and oncology.
- To trace therapeutic strategies targeting SRC proteins.
Main Methods:
- Literature review on nuclear receptor coregulation.
- Analysis of the discovery and validation of NR coregulators.
- Examination of SRC family's role in gene expression and disease.
Main Results:
- The concept of NR coregulation predates experimental validation.
- Coregulators, particularly SRCs, are essential for NR-mediated transcription.
- SRCs play critical roles in physiological processes and cancer.
Conclusions:
- The discovery of SRCs marked a milestone in understanding NR coregulation.
- SRCs are vital targets for therapeutic intervention in various diseases.
- Targeting SRCs offers promising strategies for physiological and oncological conditions.
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