1X8W
Structure of the Tetrahymena Ribozyme: Base Triple Sandwich and Metal Ion at the Active Site
Summary for 1X8W
| Entry DOI | 10.2210/pdb1x8w/pdb |
| Descriptor | Tetrahymena ribozyme RNA, MAGNESIUM ION (2 entities in total) |
| Functional Keywords | catalytic rna, ribozyme, group i intron, guanosine binding site, metal ions, active site, catalytic mechanism, base triples, conformational changes, rna |
| Total number of polymer chains | 4 |
| Total formula weight | 320789.34 |
| Authors | Guo, F.,Gooding, A.R.,Cech, T.R. (deposition date: 2004-08-18, release date: 2004-11-09, Last modification date: 2024-02-14) |
| Primary citation | Guo, F.,Gooding, A.R.,Cech, T.R. Structure of the Tetrahymena ribozyme: base triple sandwich and metal ion at the active site. Mol.Cell, 16:351-362, 2004 Cited by PubMed Abstract: 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. PubMed: 15525509DOI: 10.1016/j.molcel.2004.10.003 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (3.8 Å) |
Structure validation
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