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==Crystal Structures of the SMK box (SAM-III) Riboswitch with SAH== | |||
<StructureSection load='3e5e' size='340' side='right' caption='[[3e5e]], [[Resolution|resolution]] 2.90Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[3e5e]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3E5E OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3E5E FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=SAH:S-ADENOSYL-L-HOMOCYSTEINE'>SAH</scene>, <scene name='pdbligand=SR:STRONTIUM+ION'>SR</scene></td></tr> | |||
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=GTP:GUANOSINE-5-TRIPHOSPHATE'>GTP</scene></td></tr> | |||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3e5c|3e5c]], [[3e5f|3e5f]]</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=3e5e FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3e5e OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3e5e RCSB], [http://www.ebi.ac.uk/pdbsum/3e5e PDBsum]</span></td></tr> | |||
</table> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Three distinct classes of S-adenosyl-L-methionine (SAM)-responsive riboswitches have been identified that regulate bacterial gene expression at the levels of transcription attenuation or translation inhibition. The S(MK) box (SAM-III) translational riboswitch has been identified in the SAM synthetase gene in members of the Lactobacillales. Here we report the 2.2-A crystal structure of the Enterococcus faecalis S(MK) box riboswitch. The Y-shaped riboswitch organizes its conserved nucleotides around a three-way junction for SAM recognition. The Shine-Dalgarno sequence, which is sequestered by base-pairing with the anti-Shine-Dalgarno sequence in response to SAM binding, also directly participates in SAM recognition. The riboswitch makes extensive interactions with the adenosine and sulfonium moieties of SAM but does not appear to recognize the tail of the methionine moiety. We captured a structural snapshot of the S(MK) box riboswitch sampling the near-cognate ligand S-adenosyl-L-homocysteine (SAH) in which SAH was found to adopt an alternative conformation and fails to make several key interactions. | |||
Crystal structures of the SAM-III/S(MK) riboswitch reveal the SAM-dependent translation inhibition mechanism.,Lu C, Smith AM, Fuchs RT, Ding F, Rajashankar K, Henkin TM, Ke A Nat Struct Mol Biol. 2008 Oct;15(10):1076-83. Epub 2008 Sep 21. PMID:18806797<ref>PMID:18806797</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
==See Also== | ==See Also== | ||
*[[Riboswitch|Riboswitch]] | *[[Riboswitch|Riboswitch]] | ||
[[Category: Lu, C | == References == | ||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Lu, C]] | |||
[[Category: Rna]] | [[Category: Rna]] | ||
[[Category: Smk sam riboswitch shine-delgarno translation regulation]] | [[Category: Smk sam riboswitch shine-delgarno translation regulation]] | ||
Revision as of 17:05, 17 December 2014
Crystal Structures of the SMK box (SAM-III) Riboswitch with SAHCrystal Structures of the SMK box (SAM-III) Riboswitch with SAH
Structural highlights
Publication Abstract from PubMedThree distinct classes of S-adenosyl-L-methionine (SAM)-responsive riboswitches have been identified that regulate bacterial gene expression at the levels of transcription attenuation or translation inhibition. The S(MK) box (SAM-III) translational riboswitch has been identified in the SAM synthetase gene in members of the Lactobacillales. Here we report the 2.2-A crystal structure of the Enterococcus faecalis S(MK) box riboswitch. The Y-shaped riboswitch organizes its conserved nucleotides around a three-way junction for SAM recognition. The Shine-Dalgarno sequence, which is sequestered by base-pairing with the anti-Shine-Dalgarno sequence in response to SAM binding, also directly participates in SAM recognition. The riboswitch makes extensive interactions with the adenosine and sulfonium moieties of SAM but does not appear to recognize the tail of the methionine moiety. We captured a structural snapshot of the S(MK) box riboswitch sampling the near-cognate ligand S-adenosyl-L-homocysteine (SAH) in which SAH was found to adopt an alternative conformation and fails to make several key interactions. Crystal structures of the SAM-III/S(MK) riboswitch reveal the SAM-dependent translation inhibition mechanism.,Lu C, Smith AM, Fuchs RT, Ding F, Rajashankar K, Henkin TM, Ke A Nat Struct Mol Biol. 2008 Oct;15(10):1076-83. Epub 2008 Sep 21. PMID:18806797[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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