6g7z: Difference between revisions

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OCA

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-'''Unreleased structure'''
-The entry 6g7z is ON HOLD  until May 04 2019
+==Lariat-capping ribozyme with a shortened DP2 stem loop==
+<StructureSection load='6g7z' size='340' side='right'caption='[[6g7z]], [[Resolution|resolution]] 3.34&Aring;' scene=''>
+== Structural highlights ==
+<table><tr><td colspan='2'>[[6g7z]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6G7Z OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6G7Z FirstGlance]. <br>
+</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MES:2-(N-MORPHOLINO)-ETHANESULFONIC+ACID'>MES</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
+<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4p8z|4p8z]], [[4p95|4p95]], [[4p9r|4p9r]]</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=6g7z FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6g7z OCA], [http://pdbe.org/6g7z PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6g7z RCSB], [http://www.ebi.ac.uk/pdbsum/6g7z PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6g7z ProSAT]</span></td></tr>
+</table>
+<div style="background-color:#fffaf0;">
+== Publication Abstract from PubMed ==
+If the A-form helix is the major structural motif found in RNA, the loops that cap them constitute the second most important family of motifs. Among those, two are overrepresented, GNRA and UNCG tetraloops. Recent surveys of RNA structures deposited in the PDB show that GNRA and UNCG tetraloops can adopt tertiary folds that are very different from their canonical conformations, characterized by the presence of a U-turn of a Z-turn, respectively. Crystallographic data from both a lariat-capping (LC) ribozyme and a group II intron ribozyme reveal that a given UUCG tetraloop can adopt a distinct fold depending on its structural environment. Specifically, when the crystal packing applies relaxed constraints on the loop, the canonical Z-turn conformation is observed. In contrast, a highly packed environment induces "squashing" of the tetraloop by distorting its sugar-phosphate backbone in a specific way that expels the first and fourth nucleobases out of the loop, and falls in van der Waals distance of the last base pair of the helix, taking the place of the pair formed between the first and fourth residues in Z-turn loops. The biological relevance of our observations is supported by the presence of similarly deformed loops in the highly packed environment of the ribosome and in a complex between a dsRNA and a RNase III. The finding that Z-turn loops change conformation under higher molecular packing suggests that, in addition to their demonstrated role in stabilizing RNA folding, they may contribute to the three-dimensional structure of RNA by mediating tertiary interactions with distal residues.
-Authors: Masquida, B., Meyer, M., Olieric, V.
+Conformational adaptation of UNCG loops upon crowding.,Meyer M, Walbott H, Olieric V, Kondo J, Costa M, Masquida B RNA. 2019 Nov;25(11):1522-1531. doi: 10.1261/rna.072694.119. Epub 2019 Aug 19. PMID:31427457<ref>PMID:31427457</ref>
-Description: Lariat-capping ribozyme with a shortened DP2 stem loop
+From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
-[[Category: Unreleased Structures]]
+</div>
+<div class="pdbe-citations 6g7z" style="background-color:#fffaf0;"></div>
+== References ==
+<references/>
+__TOC__
+</StructureSection>
+[[Category: Large Structures]]
+[[Category: Masquida, B]]
+[[Category: Meyer, M]]
 [[Category: Olieric, V]]
-[[Category: Meyer, M]]
+[[Category: Lariat capping ribozyme]]
-[[Category: Masquida, B]]
+[[Category: Rna]]