Molecular model for the chaperoning of transcription factors by Hap46/BAG-1M. A simplified version of the transcriptional initiation complex is shown arbitrarily with 3 molecules of Hap46/BAG-1M bound to DNA; these are shown to establish various contacts via Hsp70 chaperones. Pol II, RNA polymerase II; TFII, basal transcription factor II; RE, response element on DNA; BP, specific response element binding protein, for example, a steroid hormone receptor complexed with its specific ligand (from Gehring 2004)