Insights into the binding mode and mechanism of action of some atypical retinoids as ligands of the small heterodimer partner (SHP)

J Comput Aided Mol Des. 2010 Nov;24(11):943-56. doi: 10.1007/s10822-010-9386-9. Epub 2010 Sep 30.

Abstract

The Small Heterodimer Partner (SHP) is an orphan nuclear receptor and an atypical member of the nuclear receptor superfamily Since its discovery, a growing body of evidences have pointed out a pivotal role for SHP in the transcriptional regulation of a variety of target genes involved in diverse metabolic pathways. While we have previously developed a homology model of the structure of SHP that was instrumental to identify a putative ligand binding pocket and suggest the possibility of the development of synthetic modulators, others reported that some atypical retinoids may represent the first synthetic ligands for this receptor. In this work, we report a combined computational approach aimed at shedding further lights on the binding mode and mechanism of action of some atypical retinoids as ligands of SHP. The results have been instrumental to design mutagenesis experiments whose preliminary data suggest the presence of a functional site in SHP as defined by residues Phe96, Arg138 and Arg238. While further experimental studies are ongoing, these findings constitute the basis for the design and identification of novel synthetic modulators of SHP functions.

MeSH terms

  • Amino Acid Sequence
  • Humans
  • In Vitro Techniques
  • Ligands
  • Models, Molecular
  • Molecular Dynamics Simulation
  • Molecular Sequence Data
  • Mutagenesis, Site-Directed
  • Mutant Proteins / chemistry
  • Mutant Proteins / genetics
  • Mutant Proteins / metabolism
  • Protein Binding
  • Protein Conformation
  • Protein Interaction Domains and Motifs
  • Receptors, Cytoplasmic and Nuclear / chemistry*
  • Receptors, Cytoplasmic and Nuclear / genetics
  • Receptors, Cytoplasmic and Nuclear / metabolism
  • Retinoids / chemistry*
  • Retinoids / metabolism
  • Sequence Homology, Amino Acid
  • Structural Homology, Protein

Substances

  • Ligands
  • Mutant Proteins
  • Receptors, Cytoplasmic and Nuclear
  • Retinoids
  • nuclear receptor subfamily 0, group B, member 2