1xv9: Difference between revisions
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'''crystal structure of CAR/RXR heterodimer bound with SRC1 peptide, fatty acid, and 5b-pregnane-3,20-dione.''' | '''crystal structure of CAR/RXR heterodimer bound with SRC1 peptide, fatty acid, and 5b-pregnane-3,20-dione.''' | ||
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[[Category: Wisely, B B.]] | [[Category: Wisely, B B.]] | ||
[[Category: Xu, R X.]] | [[Category: Xu, R X.]] | ||
[[Category: | [[Category: Car]] | ||
[[Category: | [[Category: Pregnanedione]] | ||
[[Category: | [[Category: Rxr]] | ||
[[Category: | [[Category: Src1]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 15:33:01 2008'' | |||
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Revision as of 15:33, 3 May 2008
crystal structure of CAR/RXR heterodimer bound with SRC1 peptide, fatty acid, and 5b-pregnane-3,20-dione.
OverviewOverview
The X-ray crystal structure of the human constitutive androstane receptor (CAR, NR1I3)/retinoid X receptor alpha (RXRalpha, NR2B1) heterodimer sheds light on the mechanism of ligand-independent activation of transcription by nuclear receptors. CAR contains a single-turn Helix X that restricts the conformational freedom of the C-terminal AF2 helix, favoring the active state of the receptor. Helix X and AF2 sit atop four amino acids that shield the CAR ligand binding pocket. A fatty acid ligand was identified in the RXRalpha binding pocket. The endogenous RXRalpha ligand, combined with stabilizing interactions from the heterodimer interface, served to hold RXRalpha in an active conformation. The structure suggests that upon translocation, CAR/RXRalpha heterodimers are preorganized in an active conformation in cells such that they can regulate transcription of target genes. Insights into the molecular basis of CAR constitutive activity can be exploited in the design of inverse agonists as drugs for treatment of obesity.
About this StructureAbout this Structure
1XV9 is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.
ReferenceReference
A structural basis for constitutive activity in the human CAR/RXRalpha heterodimer., Xu RX, Lambert MH, Wisely BB, Warren EN, Weinert EE, Waitt GM, Williams JD, Collins JL, Moore LB, Willson TM, Moore JT, Mol Cell. 2004 Dec 22;16(6):919-28. PMID:15610735 Page seeded by OCA on Sat May 3 15:33:01 2008