4q9q | pdb_00004q9q

Crystal structure of an RNA aptamer bound to bromo-ligand analog in complex with Fab

spinqualitylabelsall models 4q9q, resolution 2.45Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4q9q is a 3 chain structure with sequence from Lk3 transgenic mice. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: 2ZZ, K, MG NonStd Res: GDP Related: 4kzd, 4kze, 4q9r Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Spinach is an in vitro-selected RNA aptamer that binds a GFP-like ligand and activates its green fluorescence. Spinach is thus an RNA analog of GFP and has potentially widespread applications for in vivo labeling and imaging. We used antibody-assisted crystallography to determine the structures of Spinach both with and without bound fluorophore at 2.2-A and 2.4-A resolution, respectively. Spinach RNA has an elongated structure containing two helical domains separated by an internal bulge that folds into a G-quadruplex motif of unusual topology. The G-quadruplex motif and adjacent nucleotides comprise a partially preformed binding site for the fluorophore. The fluorophore binds in a planar conformation and makes extensive aromatic stacking and hydrogen bond interactions with the RNA. Our findings provide a foundation for structure-based engineering of new fluorophore-binding RNA aptamers. A G-quadruplex-containing RNA activates fluorescence in a GFP-like fluorophore.,Huang H, Suslov NB, Li NS, Shelke SA, Evans ME, Koldobskaya Y, Rice PA, Piccirilli JA Nat Chem Biol. 2014 Jun 22. doi: 10.1038/nchembio.1561. PMID:24952597 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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