1zzn

Crystal structure of a group I intron/two exon complex that includes all catalytic metal ion ligands.

spinqualitylabelsall models 1zzn, resolution 3.37Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1zzn is a 4 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.37Å Ligands: 5MU, A23, GTP, K, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function SNRPA_HUMAN Binds stem loop II of U1 snRNA. It is the first snRNP to interact with pre-mRNA. This interaction is required for the subsequent binding of U2 snRNP and the U4/U6/U5 tri-snRNP. In a snRNP-free form (SF-A) may be involved in coupled pre-mRNA splicing and polyadenylation process. Binds preferentially to the 5'-UGCAC-3' motif in vitro. 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 We report the 3.4 angstrom crystal structure of a catalytically active group I intron splicing intermediate containing the complete intron, both exons, the scissile phosphate, and all of the functional groups implicated in catalytic metal ion coordination, including the 2'-OH of the terminal guanosine. This structure suggests that, like protein phosphoryltransferases, an RNA phosphoryltransferase can use a two-metal-ion mechanism. Two Mg2+ ions are positioned 3.9 angstroms apart and are directly coordinated by all six of the biochemically predicted ligands. The evolutionary convergence of RNA and protein active sites on the same inorganic architecture highlights the intrinsic chemical capacity of the two-metal-ion catalytic mechanism for phosphoryl transfer. Structural evidence for a two-metal-ion mechanism of group I intron splicing.,Stahley MR, Strobel SA Science. 2005 Sep 2;309(5740):1587-90. PMID:16141079 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Kink-turn motif Nucleoprotein 3D structures Ribozyme 3D structures User:Wayne Decatur/kink-turn motif

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