View source for 3hkm


==Crystal Structure of rice(Oryza sativa) Rrp46==
<StructureSection load='3hkm' size='340' side='right'caption='[[3hkm]], [[Resolution|resolution]] 1.98&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3hkm]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Oryza_sativa_Japonica_Group Oryza sativa Japonica Group]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3HKM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3HKM FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.9845&#8491;</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3hkm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3hkm OCA], [https://pdbe.org/3hkm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3hkm RCSB], [https://www.ebi.ac.uk/pdbsum/3hkm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3hkm ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/EXOS5_ORYSJ 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.<ref>PMID:20660080</ref> 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/hk/3hkm_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=3hkm ConSurf].
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== 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<ref>PMID:20660080</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Oryza sativa Japonica Group]]
[[Category: Doudeva LG]]
[[Category: Hsiao Y-Y]]
[[Category: Wang Y-T]]
[[Category: Yang C-C]]
[[Category: Yuan HS]]