View source for 5nep


==The structure of the G. violaceus guanidine II riboswitch P1 stem-loop with methylguanidine==
<StructureSection load='5nep' size='340' side='right'caption='[[5nep]], [[Resolution|resolution]] 1.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5nep]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Gloeobacter_violaceus Gloeobacter violaceus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5NEP OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5NEP FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.6&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CBV:5-BROMOCYTIDINE+5-(DIHYDROGEN+PHOSPHATE)'>CBV</scene>, <scene name='pdbligand=MGX:1-METHYLGUANIDINE'>MGX</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=5nep FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5nep OCA], [https://pdbe.org/5nep PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5nep RCSB], [https://www.ebi.ac.uk/pdbsum/5nep PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5nep ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The guanidine-II (mini-ykkC) riboswitch is the smallest of the guanidine-responsive riboswitches, comprising two stem loops of similar sequence. We have solved high-resolution crystal structures of both stem loops for the riboswitch from Gloeobacter violaceus. The stem loops have a strong propensity to dimerize by intimate loop-loop interaction. The dimerization creates specific binding pockets for two guanidine molecules, explaining their cooperative binding. Within the binding pockets the ligands are hydrogen bonded to a guanine at O6 and N7, and to successive backbone phosphates. Additionally they are each stacked upon a guanine nucleobase. One side of the pocket has an opening to the solvent, slightly lowering the specificity of ligand binding, and structures with bound methylguanidine, aminoguanidine, and agmatine show how this is possible.

The Structure of the Guanidine-II Riboswitch.,Huang L, Wang J, Lilley DMJ Cell Chem Biol. 2017 Jun 22;24(6):695-702.e2. doi:, 10.1016/j.chembiol.2017.05.014. Epub 2017 May 18. PMID:28529131<ref>PMID:28529131</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5nep" style="background-color:#fffaf0;"></div>

==See Also==
*[[Riboswitch 3D structures|Riboswitch 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Gloeobacter violaceus]]
[[Category: Large Structures]]
[[Category: Huang L]]
[[Category: Lilley DMJ]]
[[Category: Wang J]]