3hkm

Crystal Structure of rice(Oryza sativa) Rrp46

spinqualitylabelsall models 3hkm, resolution 1.98Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3hkm is a 3 chain structure with sequence from Oryza sativa Japonica Group. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.9845Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function EXOS5_ORYSJ Probable component of the exosome 3'->5' exoribonuclease complex, a complex that degrades inherently unstable mRNAs containing AU-rich elements (AREs) within their 3'-untranslated regions. May form a homodimer separately from exosome complexes and function in DNA cleavage process. Binds double-stranded DNA (dsDNA) and single-stranded RNA (ssRNA), and possesses hydrolytic DNase and phosphorolytic RNase activities 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 Rrp46 was first identified as a protein component of the eukaryotic exosome, a protein complex involved in 3' processing of RNA during RNA turnover and surveillance. The Rrp46 homolog, CRN-5, was subsequently characterized as a cell death-related nuclease, participating in DNA fragmentation during apoptosis in Caenorhabditis elegans. Here we report the crystal structures of CRN-5 and rice Rrp46 (oRrp46) at a resolution of 3.9 A and 2.0 A, respectively. We found that recombinant human Rrp46 (hRrp46), oRrp46, and CRN-5 are homodimers, and that endogenous hRrp46 and oRrp46 also form homodimers in a cellular environment, in addition to their association with a protein complex. Dimeric oRrp46 had both phosphorolytic RNase and hydrolytic DNase activities, whereas hRrp46 and CRN-5 bound to DNA without detectable nuclease activity. Site-directed mutagenesis in oRrp46 abolished either its DNase (E160Q) or RNase (K75E/Q76E) activities, confirming the critical importance of these residues in catalysis or substrate binding. Moreover, CRN-5 directly interacted with the apoptotic nuclease CRN-4 and enhanced the DNase activity of CRN-4, suggesting that CRN-5 cooperates with CRN-4 in apoptotic DNA degradation. Taken together all these results strongly suggest that Rrp46 forms a homodimer separately from exosome complexes and, depending on species, is either a structural or catalytic component of the machinery that cleaves DNA during apoptosis. Structural and biochemical characterization of CRN-5 and Rrp46: an exosome component participating in apoptotic DNA degradation.,Yang CC, Wang YT, Hsiao YY, Doudeva LG, Kuo PH, Chow SY, Yuan HS RNA. 2010 Sep;16(9):1748-59. Epub 2010 Jul 21. PMID:20660080 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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