| Structural highlights
4qcm is a 25 chain structure with sequence from [1], Thermus thermophilus and Thermus thermophilus hb8. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
| | Ligands: | , , ,
| | NonStd Res: | , , , , , , , |
| Related: | 4qcn, 4qco, 4qcp |
| Resources: | FirstGlance, OCA, RCSB, PDBsum |
Publication Abstract from PubMed
During peptide-bond formation on the ribosome, the alpha-amine of an aminoacyl-tRNA attacks the ester carbonyl carbon of a peptidyl-tRNA to yield a peptide lengthened by one amino acid. Although the ribosome's contribution to catalysis is predominantly entropic, the lack of high-resolution structural data for the complete active site in complex with full-length ligands has made it difficult to assess how the ribosome might influence the pathway of the reaction. Here, we present crystal structures of preattack and postcatalysis complexes of the Thermus thermophilus 70S ribosome at ~2.6-A resolution. These structures reveal a network of hydrogen bonds along which proton transfer could take place to ensure the concerted, rate-limiting formation of a tetrahedral intermediate. We propose that, unlike earlier models, the ribosome and the A-site tRNA facilitate the deprotonation of the nucleophile through the activation of a water molecule.
A proton wire to couple aminoacyl-tRNA accommodation and peptide-bond formation on the ribosome.,Polikanov YS, Steitz TA, Innis CA Nat Struct Mol Biol. 2014 Aug 17. doi: 10.1038/nsmb.2871. PMID:25132179[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Polikanov YS, Steitz TA, Innis CA. A proton wire to couple aminoacyl-tRNA accommodation and peptide-bond formation on the ribosome. Nat Struct Mol Biol. 2014 Aug 17. doi: 10.1038/nsmb.2871. PMID:25132179 doi:http://dx.doi.org/10.1038/nsmb.2871
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