4gkk

Structure of the Thermus thermophilus 30S ribosomal subunit complexed with a human mitochondrial anticodon stem loop (ASL) of transfer RNA Methionine (TRNAMET) bound to an mRNA with an AUA-codon in the A-site and paromomycinStructure of the Thermus thermophilus 30S ribosomal subunit complexed with a human mitochondrial anticodon stem loop (ASL) of transfer RNA Methionine (TRNAMET) bound to an mRNA with an AUA-codon in the A-site and paromomycin

Structural highlights 4gkk is a 10 chain structure with sequence from Thermus thermophilus HB8. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: , , , , Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function RS2_THET8 Spans the head-body hinge region of the 30S subunit. Is loosely associated with the 30S subunit.[HAMAP-Rule:MF_00291_B] Publication Abstract from PubMed Codon use among the three domains of life is not confined to the universal genetic code. With only 22 tRNA genes in mammalian mitochondria, exceptions from the universal code are necessary for proper translation. A particularly interesting deviation is the decoding of the isoleucine AUA codon as methionine by the one mitochondrial-encoded tRNAMet. This tRNA decodes AUA and AUG in both the A- and P-sites of the metazoan mitochondrial ribosome. Enrichment of posttranscriptional modifications is a commonly appropriated mechanism for modulating decoding rules, enabling some tRNA functions while restraining others. In this case, a modification of cytidine, 5-formylcytidine (f5C), at the wobble position-34 of human mitochondrial () enables expanded decoding of AUA, resulting in a deviation in the genetic code. Visualization of the codon*anticodon interaction by X-ray crystallography revealed that recognition of both A and G at the third position of the codon occurs in the canonical Watson-Crick geometry. A modification-dependent shift in the tautomeric equilibrium toward the rare imino-oxo tautomer of cytidine stabilizes the f5C34*A base pair geometry with two hydrogen bonds. Expanded use of sense codons is regulated by modified cytidines in tRNA.,Cantara WA, Murphy FV 4th, Demirci H, Agris PF Proc Natl Acad Sci U S A. 2013 Jun 18. PMID:23781103 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribosomal protein THX 3D structures Ribosome 3D structures Transfer RNA (tRNA)

spinqualitylabelsall models 4gkk, resolution 3.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image