The androgen receptor is a ligand-activated transcription factor that binds DNA response elements as a homodimer. Binding sites for the receptor have been identified both upstream and downstream of the transcription start site. Once bound to DNA, the receptor contacts chromatin remodelling complexes, coactivator proteins and components of the general transcription machinery in order to regulate target gene expression. The main transactivation domain, termed AF1, is located within the structurally distinct amino-terminal domain. This region is structurally flexible but adopts a more folded conformation in the presence of the binding partner TFIIF, and this in turn enhances subsequent protein-protein interactions. Thus, there is likely to be a dynamic interplay between protein-protein interactions and protein folding, involving AF1, that is proposed to lead to the assembly and/or disassembly of receptor-dependent transcription complexes.

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