6ufm

Cocrystal Structure of the Nocardia farcinica ileS T-box riboswitch in complex with its cognate tRNA

spinqualitylabelsall models 6ufm, resolution 2.82Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6ufm is a 2 chain structure with sequence from Mycolicibacterium smegmatis and Nocardia farcinica. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.82Å Ligands: SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed T-box riboswitches are modular bacterial noncoding RNAs that sense and regulate amino acid availability through direct interactions with tRNAs. Between the 5' anticodon-binding stem I domain and the 3' amino acid sensing domains of most T-boxes lies the stem II domain of unknown structure and function. Here, we report a 2.8-A cocrystal structure of the Nocardia farcinica ileS T-box in complex with its cognate tRNA(Ile). The structure reveals a perpendicularly arranged ultrashort stem I containing a K-turn and an elongated stem II bearing an S-turn. Both stems rest against a compact pseudoknot, dock via an extended ribose zipper and jointly create a binding groove specific to the anticodon of its cognate tRNA. Contrary to proposed distal contacts to the tRNA elbow region, stem II locally reinforces the codon-anticodon interactions between stem I and tRNA, achieving low-nanomolar affinity. This study illustrates how mRNA junctions can create specific binding sites for interacting RNAs of prescribed sequence and structure. High-affinity recognition of specific tRNAs by an mRNA anticodon-binding groove.,Suddala KC, Zhang J Nat Struct Mol Biol. 2019 Dec;26(12):1114-1122. doi: 10.1038/s41594-019-0335-6., Epub 2019 Dec 2. PMID:31792448 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Riboswitch 3D structures

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