Analysis of hairless corepressor mutants to characterize molecular cooperation with the vitamin D receptor in promoting the mammalian hair cycle

Jui Cheng Hsieh, Stephanie A. Slater, G. Kerr Whitfield, Jamie L. Dawson, Grace Hsieh, Craig Sheedy, Carol A. Haussler, Mark R. Haussler

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

The mammalian hair cycle requires both the vitamin D receptor (VDR) and the hairless (Hr) corepressor, each of which is expressed in the hair follicle. Hr interacts directly with VDR to repress VDR-targeted transcription. Herein, we further map the VDR-interaction domain to regions in the C-terminal half of Hr that contain two LXXLL-like pairs of motifs known to mediate contact of Hr with the RAR-related orphan receptor alpha and with the thyroid hormone receptor, respectively. Site-directed mutagenesis indicates that all four hydrophobic motifs are required for VDR transrepression by Hr. Point mutation of rat Hr at conserved residues corresponding to natural mutants causing alopecia in mice (G985W and a C-terminal deletion ΔAK) and in humans (P95S, C422Y, E611G, R640Q, C642G, N988S, D1030N, A1040T, V1074M, and V1154D), as well as alteration of residues in the C-terminal Jumonji C domain implicated in histone demethylation activity (C1025G/E1027G and H1143G) revealed that all Hr mutants retained VDR association, and that transrepressor activity was selectively abrogated in C642G, G985W, N988S, D1030N, V1074M, H1143G, and V1154D. Four of these latter Hr mutants (C642G, N988S, D1030N, and V1154D) were found to associate normally with histone deacetylase-3. Finally, we identified three regions of human VDR necessary for association with Hr, namely residues 109-111, 134-201, and 202-303. It is concluded that Hr and VDR interact via multiple protein-protein interfaces, with Hr recruiting histone deacetylases and possibly itself catalyzing histone demethylation to effect chromatin remodeling and repress the transcription of VDR target genes that control the hair cycle.

Original languageEnglish (US)
Pages (from-to)671-686
Number of pages16
JournalJournal of Cellular Biochemistry
Volume110
Issue number3
DOIs
StatePublished - Jun 1 2010

Keywords

  • Calcitriol receptors
  • Histone deacetylase
  • Histone demethylase
  • Human HR protein
  • Jumonji domain
  • Rat HR protein

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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