PMID- 23015691 OWN - NLM STAT- MEDLINE DCOM- 20130611 LR - 20211203 IS - 1096-0929 (Electronic) IS - 1096-0929 (Linking) VI - 131 IP - 1 DP - 2013 Jan TI - Quantitative analysis of the interaction of constitutive androstane receptor with chemicals and steroid receptor coactivator 1 using surface plasmon resonance biosensor systems: a case study of the Baikal seal (Pusa sibirica) and the mouse. PG - 116-27 LID - 10.1093/toxsci/kfs288 [doi] AB - The constitutive androstane receptor (CAR) not only displays a high basal transcriptional activity but also acts as a ligand-dependent transcriptional factor. It is known that CAR exhibits different ligand profiles across species. However, the mechanisms underlying CAR activation by chemicals and the species-specific responses are not fully understood. The objectives of this study are to establish a high-throughput tool to screen CAR ligands and to clarify how CAR proteins from the Baikal seal (bsCAR) and the mouse (mCAR) interact with chemicals and steroid receptor coactivator 1 (SRC1). We developed the surface plasmon resonance (SPR) system to assess quantitatively the interaction of CAR with potential ligands and SRC1. The ligand-binding domain (LBD) of bsCAR and mCAR was synthesized in a wheat germ cell-free system. The purified CAR LBD was then immobilized on the sensor chip for the SPR assay, and the kinetics of direct interaction of CARs with ligand candidates was measured. Androstanol and androstenol, estrone, 17beta-estradiol, TCPOBOP, and CITCO showed compound-specific but similar affinities for both CARs. The CAR-SRC1 interaction was ligand dependent but exhibited a different ligand profile between the seal and the mouse. The results of SRC1 interaction assay accounted for those of our previous in vitro CAR-mediated transactivation assay. In silico analyses also supported the results of CAR-SRC1 interaction; there is little structural difference in the ligand-binding pocket of bsCAR and mCAR, but there is a distinct discrimination in the helix 11 and 12 of these receptors, suggesting that the interaction of ligand-bound CAR and SRC1 is critical for determining species-specific and ligand-dependent transactivation over the basal activity. The SPR assays demonstrated a potential as a high-throughput screening tool of CAR ligands. FAU - Dau, Pham Thi AU - Dau PT AD - Center for Marine Environmental Studies, Ehime University, Matsuyama 790-8577, Japan. FAU - Sakai, Hiroki AU - Sakai H FAU - Hirano, Masashi AU - Hirano M FAU - Ishibashi, Hiroshi AU - Ishibashi H FAU - Tanaka, Yuki AU - Tanaka Y FAU - Kameda, Kenji AU - Kameda K FAU - Fujino, Takahiro AU - Fujino T FAU - Kim, Eun-Young AU - Kim EY FAU - Iwata, Hisato AU - Iwata H LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20120926 PL - United States TA - Toxicol Sci JT - Toxicological sciences : an official journal of the Society of Toxicology JID - 9805461 RN - 0 (Constitutive Androstane Receptor) RN - 0 (Environmental Pollutants) RN - 0 (Ligands) RN - 0 (Receptors, Cytoplasmic and Nuclear) RN - EC 2.3.1.48 (Nuclear Receptor Coactivator 1) SB - IM MH - Animals MH - Cloning, Molecular MH - Constitutive Androstane Receptor MH - Environmental Pollutants/*chemistry/metabolism MH - High-Throughput Screening Assays MH - Ligands MH - Mice MH - Nuclear Receptor Coactivator 1/*chemistry/genetics/metabolism MH - Protein Binding MH - Protein Interaction Mapping MH - Receptors, Cytoplasmic and Nuclear/*chemistry/genetics/metabolism MH - *Seals, Earless/metabolism MH - Species Specificity MH - Surface Plasmon Resonance EDAT- 2012/09/28 06:00 MHDA- 2013/06/12 06:00 CRDT- 2012/09/28 06:00 PHST- 2012/09/28 06:00 [entrez] PHST- 2012/09/28 06:00 [pubmed] PHST- 2013/06/12 06:00 [medline] AID - kfs288 [pii] AID - 10.1093/toxsci/kfs288 [doi] PST - ppublish SO - Toxicol Sci. 2013 Jan;131(1):116-27. doi: 10.1093/toxsci/kfs288. Epub 2012 Sep 26.