1x8w

<table><tr><td colspan='2'>[[1x8w]] is a 4 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1X8W OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1X8W FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></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=1x8w FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1x8w OCA], [http://pdbe.org/1x8w PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1x8w RCSB], [http://www.ebi.ac.uk/pdbsum/1x8w PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1x8w ProSAT]</span></td></tr>

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== Publication Abstract from PubMed ==

The Tetrahymena intron is an RNA catalyst, or ribozyme. As part of its self-splicing reaction, this ribozyme catalyzes phosphoryl transfer between guanosine and a substrate RNA strand. Here we report the refined crystal structure of an active Tetrahymena ribozyme in the absence of its RNA substrate at 3.8 A resolution. The 3'-terminal guanosine (omegaG), which serves as the attacking group for RNA cleavage, forms a coplanar base triple with the G264-C311 base pair, and this base triple is sandwiched by three other base triples. In addition, a metal ion is present in the active site, contacting or positioned close to the ribose of the omegaG and five phosphates. All of these phosphates have been shown to be important for catalysis. Therefore, we provide a picture of how the ribozyme active site positions both a catalytic metal ion and the nucleophilic guanosine for catalysis prior to binding its RNA substrate.

Structure of the Tetrahymena ribozyme: base triple sandwich and metal ion at the active site.,Guo F, Gooding AR, Cech TR Mol Cell. 2004 Nov 5;16(3):351-62. PMID:15525509<ref>PMID:15525509</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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<div class="pdbe-citations 1x8w" style="background-color:#fffaf0;"></div>

*[[Ribozyme|Ribozyme]]

[[Category: Cech, T R]]

[[Category: Gooding, A R]]

[[Category: Guo, F]]

[[Category: Active site]]

[[Category: Rna]]