View source for 7oz3


==S. agalactiae BusR in complex with its busA-promotor DNA==
<StructureSection load='7oz3' size='340' side='right'caption='[[7oz3]], [[Resolution|resolution]] 4.46&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[7oz3]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptococcus_agalactiae Streptococcus agalactiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7OZ3 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7OZ3 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 4.46&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=2BA:(2R,3R,3AS,5R,7AR,9R,10R,10AS,12R,14AR)-2,9-BIS(6-AMINO-9H-PURIN-9-YL)OCTAHYDRO-2H,7H-DIFURO[3,2-D 3,2-J][1,3,7,9,2,8]TETRAOXADIPHOSPHACYCLODODECINE-3,5,10,12-TETROL+5,12-DIOXIDE'>2BA</scene></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=7oz3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7oz3 OCA], [https://pdbe.org/7oz3 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7oz3 RCSB], [https://www.ebi.ac.uk/pdbsum/7oz3 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7oz3 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/K0JNC6_STRAG K0JNC6_STRAG] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The cyclic dinucleotide second messenger c-di-AMP is a major player in regulation of potassium homeostasis and osmolyte transport in a variety of bacteria. Along with various direct interactions with proteins such as potassium channels, the second messenger also specifically binds to transcription factors, thereby altering the processes in the cell on the transcriptional level. We here describe the structural and biochemical characterization of BusR from the human pathogen Streptococcus agalactiae. BusR is a member of a yet structurally uncharacterized subfamily of the GntR family of transcription factors that downregulates transcription of the genes for the BusA (OpuA) glycine-betaine transporter upon c-di-AMP binding. We report crystal structures of full-length BusR, its apo and c-di-AMP bound effector domain, as well as cryo-EM structures of BusR bound to its operator DNA. Our structural data, supported by biochemical and biophysical data, reveal that BusR utilizes a unique domain assembly with a tetrameric coiled-coil in between the binding platforms, serving as a molecular ruler to specifically recognize a 22 bp separated bipartite binding motif. Binding of c-di-AMP to BusR induces a shift in equilibrium from an inactivated towards an activated state that allows BusR to bind the target DNA, leading to transcriptional repression.

BusR senses bipartite DNA binding motifs by a unique molecular ruler architecture.,Bandera AM, Bartho J, Lammens K, Drexler DJ, Kleinschwarzer J, Hopfner KP, Witte G Nucleic Acids Res. 2021 Sep 27;49(17):10166-10177. doi: 10.1093/nar/gkab736. PMID:34432045<ref>PMID:34432045</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 7oz3" style="background-color:#fffaf0;"></div>

==See Also==
*[[Transcriptional activator 3D structures|Transcriptional activator 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Streptococcus agalactiae]]
[[Category: Bandera AM]]
[[Category: Witte G]]