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The Vitamin D Receptor Interacts Preferentially with DRIP205-like LxxLL Motifs

Overview
Publisher Elsevier
Specialties Biochemistry
Biophysics
Date 2007 Jan 27
PMID 17254542
Citations 8
Authors
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Abstract

The vitamin D receptor (VDR) mediates the biological actions of 1,25-dihydroxyvitamin D3 (1,25(OH)2D3) through its capacity to recruit coregulatory proteins. This interaction is mediated via a coregulatory LxxLL motif. We screened a combinatorial (x)7LxxLL(x)7 phage library with purified VDR to identify peptides that displayed high affinity and selectivity for VDR. These peptides contained the consensus sequence Lx E/H x H/F P L/M/I LxxLL and exhibited significant sequence similarity to the active LxxLL box found in DRIP205. Nearly all LxxLL peptides interacted in a ligand-dependent manner directly with human VDR. However, a pattern of selectivity of the peptides for other members of the nuclear receptor family was also observed. Interestingly, the interaction between the VDR and many of the peptides was differentially sensitive to a broad assortment of VDR ligands. Finally, several of these peptides were shown to inhibit activation of a 1,25(OH)2D3-sensitive reporter gene. These studies suggest that the LxxLL motif can interact directly with the VDR and that this interaction is regulated by chemically diverse vitamin D ligands.

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