1mfk | pdb_00001mfk

Structure of Prokaryotic SECIS mRNA Hairpin

spinqualitylabelsall models 1mfk, 20 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1mfk is a 1 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed In prokaryotes, the recoding of a UGA stop codon as a selenocysteine codon requires a special elongation factor (EF) SelB and a stem-loop structure within the mRNA called a selenocysteine insertion sequence (SECIS). Here, we used NMR spectroscopy to determine the solution structure of the SECIS mRNA hairpin and characterized its interaction with the mRNA-binding domain of SelB. Our structural and biochemical data identified the conserved structural features important for binding to EF SelB within different SECIS RNA sequences. In the free SECIS mRNA structure, conserved nucleotides are strongly exposed for recognition by SelB. Binding of the C-terminal domain of SelB stabilizes the RNA secondary structure. In the protein-RNA complex, a Watson-Crick loop base-pair leaves a GpU sequence accessible for SelB recognition. This GpU sequence at the tip of the capping tetraloop and a bulge uracil five Watson-Crick base-pairs apart from the GpU are essential for interaction with SelB. Structure of prokaryotic SECIS mRNA hairpin and its interaction with elongation factor SelB.,Fourmy D, Guittet E, Yoshizawa S J Mol Biol. 2002 Nov 15;324(1):137-50. PMID:12421564 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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