Identification of an alternative ligand-binding pocket in the nuclear vitamin D receptor and its functional importance in 1alpha,25(OH)2-vitamin D3 signaling.

ABSTRACT: Structural and molecular studies have shown that the vitamin D receptor (VDR) mediates 1alpha,25(OH)2-vitamin D3 gene transactivation. Recent evidence indicates that both VDR and the estrogen receptor are localized to plasma membrane caveolae and are required for initiation of nongenomic (NG) responses. Computer docking of the NG-specific 1alpha,25(OH)2-lumisterol to the VDR resulted in identification of an alternative ligand-binding pocket that partially overlaps the genomic pocket described in the experimentally determined x-ray structure. Data obtained from docking five different vitamin D sterols in the genomic and alternative pockets were used to generate a receptor conformational ensemble model, providing an explanation for how VDR and possibly the estrogen receptor can have genomic

SUBMITTER: Mizwicki MT 

PROVIDER: S-EPMC516488 | biostudies-literature | 2004 Aug

REPOSITORIES: biostudies-literature