PMID- 7935766 OWN - NLM STAT- MEDLINE DCOM- 19941031 LR - 20061115 IS - 0028-0836 (Print) IS - 0028-0836 (Linking) VI - 371 IP - 6497 DP - 1994 Oct 6 TI - Regulation of retinoid signalling by receptor polarity and allosteric control of ligand binding. PG - 528-31 AB - Retinoic acid receptors (RARs) and retinoid X receptors (RXRs) regulate transcription by binding to response elements in target genes that generally consist of two direct repeat half-sites of consensus sequence AGGTCA (ref. 1). RAR/RXR heterodimers activate transcription in response to all-trans or 9-cis retinoic acid by binding to direct repeats spaced by five base pairs (DR5 elements), such that RAR occupies the downstream half-site. RXR homodimers activate transcription in response to 9-cis retinoic acid by binding to direct repeats spaced by one base pair (DR1 elements). Although RXR/RAR heterodimers bind to DR1 elements with higher affinity than RXR homodimers, in most contexts they are unable to activate transcription in response to either all-trans or 9-cis retinoic acid. As a result, RARs inhibit RXR-dependent transcription from these sites. We report that the switching of the RAR from an activator to an inhibitor of retinoid-dependent transcription requires that it be bound to the upstream half-site of DR1 elements and that it allosterically block the binding of ligand to the RXR. FAU - Kurokawa, R AU - Kurokawa R AD - Division of Cellular and Molecular Medicine, University of California, San Diego 92093-0656. FAU - DiRenzo, J AU - DiRenzo J FAU - Boehm, M AU - Boehm M FAU - Sugarman, J AU - Sugarman J FAU - Gloss, B AU - Gloss B FAU - Rosenfeld, M G AU - Rosenfeld MG FAU - Heyman, R A AU - Heyman RA FAU - Glass, C K AU - Glass CK LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, P.H.S. PL - England TA - Nature JT - Nature JID - 0410462 RN - 0 (Ligands) RN - 0 (Receptors, Cytoplasmic and Nuclear) RN - 0 (Receptors, Retinoic Acid) RN - 0 (Recombinant Fusion Proteins) RN - 0 (Retinoid X Receptors) RN - 0 (Transcription Factors) RN - 9007-49-2 (DNA) SB - IM MH - Allosteric Regulation MH - Base Sequence MH - Cell Line MH - DNA/metabolism MH - Escherichia coli MH - Humans MH - Ligands MH - Molecular Sequence Data MH - Protein Binding MH - Receptors, Cytoplasmic and Nuclear/*metabolism MH - Receptors, Retinoic Acid/*metabolism MH - Recombinant Fusion Proteins/metabolism MH - Repetitive Sequences, Nucleic Acid MH - Retinoid X Receptors MH - *Signal Transduction MH - *Transcription Factors MH - *Transcription, Genetic EDAT- 1994/10/06 00:00 MHDA- 1994/10/06 00:01 CRDT- 1994/10/06 00:00 PHST- 1994/10/06 00:00 [pubmed] PHST- 1994/10/06 00:01 [medline] PHST- 1994/10/06 00:00 [entrez] AID - 10.1038/371528a0 [doi] PST - ppublish SO - Nature. 1994 Oct 6;371(6497):528-31. doi: 10.1038/371528a0.