3bnn | pdb_00003bnn

Crystal Structure of the Homo sapiens Mitochondrial Ribosomal Decoding Site

spinqualitylabelsall models 3bnn, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3bnn is a 4 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 3bnl, 3bno, 3bnp, 3bnq, 3bnr, 3bns, 3bnt Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The A site of the small ribosomal subunit participates in the fidelity of decoding by switching between two states, a resting 'off' state and an active decoding 'on' state. Eight crystal structures of RNA duplexes containing two minimal decoding A sites of the Homo sapiens mitochondrial wild-type, the A1555G mutant or bacteria have been solved. The resting 'off' state of the mitochondrial wild-type A site is surprisingly different from that of the bacterial A site. The mitochondrial A1555G mutant has two types of the 'off' states; one is similar to the mitochondrial wild-type 'off' state and the other is similar to the bacterial 'off' state. Our present results indicate that the dynamics of the A site in bacteria and mitochondria are different, a property probably related to the small number of tRNAs used for decoding in mitochondria. Based on these structures, we propose a hypothesis for the molecular mechanism of non-syndromic hearing loss due to the mitochondrial A1555G mutation. The bacterial and mitochondrial ribosomal A-site molecular switches possess different conformational substates.,Kondo J, Westhof E Nucleic Acids Res. 2008 May;36(8):2654-66. Epub 2008 Mar 16. PMID:18346970 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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