Figure 2.
Schematic model of coregulatory complexes that are involved in mediating the actions of 1,25(OH)2D3 and the VDR. The general transcriptional apparatus is shown at the TSS and the VDR/RXR heterodimer is shown bound to its regulatory vitamin D response element or VDRE. Three regulatory complexes are shown that interact with the VDR: an ATPase-containing, chromatin remodeling complex termed SWI/SNF, a histone acetylation complex containing histone acetyltransferases (HAT) and Mediator complex. The latter facilitates the activation of RNA pol II through its C-terminal domain (CTD). Nucleosomes as well as individual proteins that comprise the individual coregulatory complexes are indicated.