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| | <StructureSection load='5ddp' size='340' side='right'caption='[[5ddp]], [[Resolution|resolution]] 2.30Å' scene=''> | | <StructureSection load='5ddp' size='340' side='right'caption='[[5ddp]], [[Resolution|resolution]] 2.30Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[5ddp]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human] and [http://en.wikipedia.org/wiki/Synechococcus_elongatus Synechococcus elongatus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5DDP OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5DDP FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[5ddp]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Synechococcus_elongatus Synechococcus elongatus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5DDP OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5DDP FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GLN:GLUTAMINE'>GLN</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</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]] 2.302Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5ddo|5ddo]], [[5ddq|5ddq]], [[5ddr|5ddr]]</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GLN:GLUTAMINE'>GLN</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">SNRPA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</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=5ddp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5ddp OCA], [https://pdbe.org/5ddp PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5ddp RCSB], [https://www.ebi.ac.uk/pdbsum/5ddp PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5ddp 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=5ddp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5ddp OCA], [http://pdbe.org/5ddp PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5ddp RCSB], [http://www.ebi.ac.uk/pdbsum/5ddp PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5ddp ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/SNRPA_HUMAN SNRPA_HUMAN]] Binds stem loop II of U1 snRNA. It is the first snRNP to interact with pre-mRNA. This interaction is required for the subsequent binding of U2 snRNP and the U4/U6/U5 tri-snRNP. In a snRNP-free form (SF-A) may be involved in coupled pre-mRNA splicing and polyadenylation process. Binds preferentially to the 5'-UGCAC-3' motif in vitro.<ref>PMID:9848648</ref> | + | [https://www.uniprot.org/uniprot/SNRPA_HUMAN SNRPA_HUMAN] Binds stem loop II of U1 snRNA. It is the first snRNP to interact with pre-mRNA. This interaction is required for the subsequent binding of U2 snRNP and the U4/U6/U5 tri-snRNP. In a snRNP-free form (SF-A) may be involved in coupled pre-mRNA splicing and polyadenylation process. Binds preferentially to the 5'-UGCAC-3' motif in vitro.<ref>PMID:9848648</ref> |
| - | <div style="background-color:#fffaf0;">
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| - | == Publication Abstract from PubMed ==
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| - | Naturally occurring L-glutamine riboswitches occur in cyanobacteria and marine metagenomes, where they reside upstream of genes involved in nitrogen metabolism. By combining X-ray, NMR, and MD, we characterized an L-glutamine-dependent conformational transition in the Synechococcus elongatus glutamine riboswitch from tuning fork to L-shaped alignment of stem segments. This transition generates an open ligand-binding pocket with L-glutamine selectivity enforced by Mg(2+)-mediated intermolecular interactions. The transition also stabilizes the P1 helix through a long-range "linchpin" Watson-Crick G-C pair-capping interaction, while melting a short helix below P1 potentially capable of modulating downstream readout. NMR data establish that the ligand-free glutamine riboswitch in Mg(2+) solution exists in a slow equilibrium between flexible tuning fork and a minor conformation, similar, but not identical, to the L-shaped bound conformation. We propose that an open ligand-binding pocket combined with a high conformational penalty for forming the ligand-bound state provide mechanisms for reducing binding affinity while retaining high selectivity.
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| - | Structural and Dynamic Basis for Low-Affinity, High-Selectivity Binding of L-Glutamine by the Glutamine Riboswitch.,Ren A, Xue Y, Peselis A, Serganov A, Al-Hashimi HM, Patel DJ Cell Rep. 2015 Dec 1;13(9):1800-13. doi: 10.1016/j.celrep.2015.10.062. Epub 2015 , Nov 19. PMID:26655897<ref>PMID:26655897</ref>
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| - | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
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| - | </div>
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| - | <div class="pdbe-citations 5ddp" style="background-color:#fffaf0;"></div>
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| - | | + | |
| - | ==See Also==
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| - | *[[Riboswitch|Riboswitch]]
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| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Human]] | + | [[Category: Homo sapiens]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| | [[Category: Synechococcus elongatus]] | | [[Category: Synechococcus elongatus]] |
| - | [[Category: Patel, D J]] | + | [[Category: Patel DJ]] |
| - | [[Category: Ren, A]] | + | [[Category: Ren A]] |
| - | [[Category: Bound-form]]
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| - | [[Category: L-glutamine]]
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| - | [[Category: Riboswitch]]
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| - | [[Category: Rna]]
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| - | [[Category: Rna binding protein-rna complex]]
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