LSDP5 is a PAT protein specifically expressed in fatty acid oxidizing tissues.

The PAT family (originally named for Perilipin, ADFP and TIP47) now includes four members: Perilipins, ADFP, TIP47 and S3-12. Significant primary sequence homology and the ability to associate with lipid storage droplets (LSDs) are well conserved within this family and across species. In this study, we have characterized a novel PAT protein, lipid storage droplet protein 5 (LSDP5) of 463 residues.

Functional conservation of interactions between a homeodomain cofactor and a mammalian FTZ-F1 homologue.

Nuclear receptors are master regulators of metazoan gene expression with crucial roles during development and in adult physiology. Fushi tarazu factor 1 (FTZ-F1) subfamily members are ancient orphan receptors with homologues from Drosophila to human that regulate diverse gene expression programs important for developmental processes, reproduction and cholesterol homeostasis in an apparently ligand-independent manner. Thus, developmental and tissue-specific cofactors may be particularly important in modulating the transcriptional activities of FTZ-F1 receptors.

Glucocorticoid response and promoter occupancy of the mouse LXRalpha gene.

The liver X receptors alpha and beta (LXRalpha and LXRbeta) are members of the nuclear receptor superfamily of proteins which are highly expressed in metabolically active tissues. They regulate gene expression of critical genes involved in cholesterol catabolism and transport, lipid and triglyceride biosynthesis, and carbohydrate metabolism in response to distinct oxysterol intermediates in the cholesterol metabolic pathway. Several LXR target genes have been identified, but there is limited information on how expression of the LXRs themselves is controlled.

Inactivation of the nuclear receptor coactivator RAP250 in mice results in placental vascular dysfunction.

Coactivators constitute a diverse group of proteins that are essential for optimal transcriptional activity of nuclear receptors. In the past few years many coactivators have been identified but it is still unclear whether these proteins interact indiscriminately with all nuclear receptors and whether there is some redundancy in their functions. We have previously cloned and characterized RAP250 (ASC-2/PRIP/TRBP/NRC), an LXXLL-containing coactivator for nuclear receptors.

Different regulation of the LXRalpha promoter activity by isoforms of CCAAT/enhancer-binding proteins.

LXRs have recently been shown to regulate key enzymes in cholesterol degradation, reverse transport of cholesterol from peripheral cells, cholesterol uptake and lipogenesis. The LXRalpha promoter was thus studied to investigate if LXRalpha gene expression is under the regulation of transcription factors involved in adipogenesis. We report that the C/EBP transcription factor interacts with the promoter of the LXRalpha gene.

Inhibition of androgen receptor (AR) function by the reproductive orphan nuclear receptor DAX-1.

DAX-1 (NROB1) is an atypical member of the nuclear receptor family that is predominantly expressed in mammalian reproductive tissues. While a receptor function of DAX-1 remains enigmatic, previous work has indicated that DAX-1 inhibits the activity of the orphan receptor steroidogenic factor 1 and the estrogen receptors (ERs), presumably via direct occupation of the coactivator-binding surface and subsequent recruitment of additional corepressors. In vivo evidence points at a particular role of DAX-1 for the development and maintenance of male reproductive functions.