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==Crystal structure of the yeast GAL regulon complex of the repressor, Gal80p, and the transducer, Gal3p, with galactose and ATP==
==Crystal structure of the yeast GAL regulon complex of the repressor, Gal80p, and the transducer, Gal3p, with galactose and ATP==
<StructureSection load='3v2u' size='340' side='right' caption='[[3v2u]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
<StructureSection load='3v2u' size='340' side='right'caption='[[3v2u]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[3v2u]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3V2U OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3V2U FirstGlance]. <br>
<table><tr><td colspan='2'>[[3v2u]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae_S288C Saccharomyces cerevisiae S288C]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3V2U OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3V2U FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ATP:ADENOSINE-5-TRIPHOSPHATE'>ATP</scene>, <scene name='pdbligand=GLA:ALPHA+D-GALACTOSE'>GLA</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.105&#8491;</td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3bts|3bts]], [[3btu|3btu]], [[3btv|3btv]], [[2aj4|2aj4]], [[3v5r|3v5r]]</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ATP:ADENOSINE-5-TRIPHOSPHATE'>ATP</scene>, <scene name='pdbligand=GLA:ALPHA+D-GALACTOSE'>GLA</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">GAL80, YML051W, YM9958.12, YM9827.01 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=4932 Saccharomyces cerevisiae]), GAL3, YDR009W, YD8119.14 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=4932 Saccharomyces cerevisiae])</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3v2u FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3v2u OCA], [https://pdbe.org/3v2u PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3v2u RCSB], [https://www.ebi.ac.uk/pdbsum/3v2u PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3v2u ProSAT]</span></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=3v2u FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3v2u OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3v2u RCSB], [http://www.ebi.ac.uk/pdbsum/3v2u PDBsum]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/GAL80_YEAST GAL80_YEAST]] This protein is a negative regulator for the gene expression of the lactose/galactose metabolic genes. It binds to GAL4 and so blocks transcriptional activation by it, in the absence of an inducing sugar.  
[https://www.uniprot.org/uniprot/GAL80_YEAST GAL80_YEAST] This protein is a negative regulator for the gene expression of the lactose/galactose metabolic genes. It binds to GAL4 and so blocks transcriptional activation by it, in the absence of an inducing sugar.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
A wealth of genetic information and some biochemical analysis have made the GAL regulon of the yeast Saccharomyces cerevisiae a classic model system for studying transcriptional activation in eukaryotes. Galactose induces this transcriptional switch, which is regulated by three proteins: the transcriptional activator Gal4p, bound to DNA; the repressor Gal80p; and the transducer Gal3p. We showed previously that NADP appears to act as a trigger to kick the repressor off the activator. Sustained activation involves a complex of the transducer Gal3p and Gal80p mediated by galactose and ATP. We solved the crystal structure of the complex of Gal3p-Gal80p with alpha-D-galactose and ATP to 2.1 A resolution. The interaction between the proteins occurs only when Gal3p is in a "closed" state induced by ligand binding. The structure of the complex provides a rationale for the phenotypes of several well-known Gal80p and Gal3p mutants as well as the lack of galactokinase activity of Gal3p.
 
The Gal3p transducer of the GAL regulon interacts with the Gal80p repressor in its ligand-induced closed conformation.,Lavy T, Kumar PR, He H, Joshua-Tor L Genes Dev. 2012 Feb 1;26(3):294-303. doi: 10.1101/gad.182691.111. PMID:22302941<ref>PMID:22302941</ref>
 
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>


==See Also==
==See Also==
*[[Gal3-Gal80-Gal4|Gal3-Gal80-Gal4]]
*[[Gal3-Gal80-Gal4|Gal3-Gal80-Gal4]]
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Saccharomyces cerevisiae]]
[[Category: Large Structures]]
[[Category: He, H]]
[[Category: Saccharomyces cerevisiae S288C]]
[[Category: Joshua-Tor, L]]
[[Category: He H]]
[[Category: Kumar, P R]]
[[Category: Joshua-Tor L]]
[[Category: Lavy, T]]
[[Category: Kumar PR]]
[[Category: Ghmp superfamily]]
[[Category: Lavy T]]
[[Category: Rossmann fold]]
[[Category: Transcription]]
[[Category: Transcription regulation]]
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