1m8v

Structure of Pyrococcus abyssii Sm Protein in Complex with a Uridine Heptamer

spinqualitylabelsall models 1m8v, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1m8v is a 21 chain structure with sequence from Pyrococcus abyssi. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.6Å Ligands: CA, U5P Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function RUXX_PYRAB Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The Sm proteins are conserved in all three domains of life and are always associated with U-rich RNA sequences. Their proposed function is to mediate RNA-RNA interactions. We present here the crystal structures of Pyrococcus abyssi Sm protein (PA-Sm1) and its complex with a uridine heptamer. The overall structure of the protein complex, a heptameric ring with a central cavity, is similar to that proposed for the eukaryotic Sm core complex and found for other archaeal Sm proteins. RNA molecules bind to the protein at two different sites. They interact specifically inside the ring with three highly conserved residues, defining the uridine-binding pocket. In addition, nucleotides also interact on the surface formed by the N-terminal alpha-helix as well as a conserved aromatic residue in beta-strand 2 of the PA-Sm1 protein. The mutation of this conserved aromatic residue shows the importance of this second site for the discrimination between RNA sequences. Given the high structural homology between archaeal and eukaryotic Sm proteins, the PA-Sm1.RNA complex provides a model for how the small nuclear RNA contacts the Sm proteins in the Sm core. In addition, it suggests how Sm proteins might exert their function as modulators of RNA-RNA interactions. Crystal structures of the Pyrococcus abyssi Sm core and its complex with RNA. Common features of RNA binding in archaea and eukarya.,Thore S, Mayer C, Sauter C, Weeks S, Suck D J Biol Chem. 2003 Jan 10;278(2):1239-47. Epub 2002 Oct 29. PMID:12409299 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Sm-like protein Sm-like protein 3D structures

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