2q1v

<table><tr><td colspan='2'>[[2q1v]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Miscellaneous_nucleic_acid Miscellaneous nucleic acid]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2Q1V OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2Q1V FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=PDN:17,21-DIHYDROXYPREGNA-1,4-DIENE-3,11,20-TRIONE'>PDN</scene></td></tr>

<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2q1h|2q1h]]</td></tr>

<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2q1v FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2q1v OCA], [http://pdbe.org/2q1v PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2q1v RCSB], [http://www.ebi.ac.uk/pdbsum/2q1v PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2q1v ProSAT]</span></td></tr>

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== Publication Abstract from PubMed ==

The structural mechanisms by which proteins have evolved new functions are known only indirectly. We report x-ray crystal structures of a resurrected ancestral protein-the approximately 450 million-year-old precursor of vertebrate glucocorticoid (GR) and mineralocorticoid (MR) receptors. Using structural, phylogenetic, and functional analysis, we identify the specific set of historical mutations that recapitulate the evolution of GR's hormone specificity from an MR-like ancestor. These substitutions repositioned crucial residues to create new receptor-ligand and intraprotein contacts. Strong epistatic interactions occur because one substitution changes the conformational position of another site. "Permissive" mutations-substitutions of no immediate consequence, which stabilize specific elements of the protein and allow it to tolerate subsequent function-switching changes-played a major role in determining GR's evolutionary trajectory.

Crystal structure of an ancient protein: evolution by conformational epistasis.,Ortlund EA, Bridgham JT, Redinbo MR, Thornton JW Science. 2007 Sep 14;317(5844):1544-8. Epub 2007 Aug 16. PMID:17702911<ref>PMID:17702911</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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== References ==

<references/>

[[Category: Miscellaneous nucleic acid]]

[[Category: Ortlund, E A]]

[[Category: Redinbo, M R]]

[[Category: Transcription]]