Abstract
The classic view of glucocorticoid mechanism of action involves the concept of a non-liganded receptor residing in the cytoplasm of cells. The receptor is maintained in an inactive state, with regard to the ability to bind to DNA, by the interaction with a multi-protein chaperone complex that contains, among other proteins, a dimer of hsp90, hsp70, hsp40, FKBP52 and p23. Of these proteins, hsp90 has been shown to maintain glucocorticoid receptor (GR) in a conformation optimal for ligand binding, and it also serves to cover the two nuclear localization signals (NL) of GR. NL1 is mapped to certain basic amino acid sequences in the DNA-binding domain and hinge region, and NL2 is broadly mapped to the ligand-binding domain of GR. Upon ligand binding, GR dissociates from hsp90 and also from several of the other chaperone proteins, and translocates to the nucleus. In the nucleus, GR is present as a homodimer and acts as a ligand-dependent transcription factor binding specific DNA sequences, i.e., glucocorticoid response elements (GRE) of glucocorticoid-regulated genes. In this process, GR can associate with adaptor proteins and the basal transcription machinery, as well as with specific transcription factors and coregulators. The classical view of GR mechanism of action has been shown to be even more complex, and GR action most likely encompasses more protein interactions than described above.
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Wikström, AC., Widén, C., Erlandsson, A., Hedman, E., Zilliacus, J. (2002). Cytosolic Glucocorticoid Receptor-Interacting Proteins. In: Cato, A.C.B., Schäcke, H., Asadullah, K. (eds) Recent Advances in Glucocorticoid Receptor Action. Ernst Schering Research Foundation Workshop, vol 40. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-04660-9_11
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DOI: https://doi.org/10.1007/978-3-662-04660-9_11
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