2nn6: Difference between revisions
New page: left|200px<br /> <applet load="2nn6" size="450" color="white" frame="true" align="right" spinBox="true" caption="2nn6, resolution 3.35Å" /> '''Structure of the hu... |
No edit summary |
||
| (19 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
== | ==Structure of the human RNA exosome composed of Rrp41, Rrp45, Rrp46, Rrp43, Mtr3, Rrp42, Csl4, Rrp4, and Rrp40== | ||
The RNA exosome is a multisubunit 3' to 5' exoribonuclease complex that | <StructureSection load='2nn6' size='340' side='right'caption='[[2nn6]], [[Resolution|resolution]] 3.35Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[2nn6]] is a 9 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. The February 2007 RCSB PDB [https://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/index.html Molecule of the Month] feature on ''Exosomes'' by David S. Goodsell is [https://dx.doi.org/10.2210/rcsb_pdb/mom_2007_2 10.2210/rcsb_pdb/mom_2007_2]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2NN6 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2NN6 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]] 3.35Å</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=2nn6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2nn6 OCA], [https://pdbe.org/2nn6 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2nn6 RCSB], [https://www.ebi.ac.uk/pdbsum/2nn6 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2nn6 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/EXOS9_HUMAN EXOS9_HUMAN] Non-catalytic component of the RNA exosome complex which has 3'->5' exoribonuclease activity and participates in a multitude of cellular RNA processing and degradation events. In the nucleus, the RNA exosome complex is involved in proper maturation of stable RNA species such as rRNA, snRNA and snoRNA, in the elimination of RNA processing by-products and non-coding 'pervasive' transcripts, such as antisense RNA species and promoter-upstream transcripts (PROMPTs), and of mRNAs with processing defects, thereby limiting or excluding their export to the cytoplasm. The RNA exosome may be involved in Ig class switch recombination (CSR) and/or Ig variable region somatic hypermutation (SHM) by targeting AICDA deamination activity to transcribed dsDNA substrates. In the cytoplasm, the RNA exosome complex is involved in general mRNA turnover and specifically degrades inherently unstable mRNAs containing AU-rich elements (AREs) within their 3' untranslated regions, and in RNA surveillance pathways, preventing translation of aberrant mRNAs. It seems to be involved in degradation of histone mRNA. The catalytic inactive RNA exosome core complex of 9 subunits (Exo-9) is proposed to play a pivotal role in the binding and presentation of RNA for ribonucleolysis, and to serve as a scaffold for the association with catalytic subunits and accessory proteins or complexes. EXOSC9 binds to ARE-containing RNAs.<ref>PMID:11782436</ref> <ref>PMID:16455498</ref> <ref>PMID:16912217</ref> <ref>PMID:17545563</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/nn/2nn6_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=2nn6 ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The RNA exosome is a multisubunit 3' to 5' exoribonuclease complex that participates in degradation and processing of cellular RNA. To determine the activities and structure of the eukaryotic exosome, we report the reconstitution of 9-subunit exosomes from yeast and human and reconstitution of 10- and 11-subunit exosomes from yeast. Comparative biochemical analysis between purified subunits and reconstituted exosomes using AU-rich, polyadenylated (poly[A]), generic, and structured RNA substrates reveals processive phosphorolytic activities for human Rrp41/Rrp45 and the 9-subunit human exosome, processive hydrolytic activities for yeast Rrp44 and the yeast 10-subunit exosome, distributive hydrolytic activities for Rrp6, and processive and distributive hydrolytic activities for the yeast 11-subunit exosome. To elucidate the architecture of a eukaryotic exosome, its conserved surfaces, and the structural basis for RNA decay, we report the X-ray structure determination for the 286 kDa nine-subunit human exosome at 3.35 A. | |||
Reconstitution, activities, and structure of the eukaryotic RNA exosome.,Liu Q, Greimann JC, Lima CD Cell. 2006 Dec 15;127(6):1223-37. PMID:17174896<ref>PMID:17174896</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 2nn6" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Exosome 3D structures|Exosome 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Exosomes]] | [[Category: Exosomes]] | ||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: | [[Category: Large Structures]] | ||
[[Category: | [[Category: RCSB PDB Molecule of the Month]] | ||
[[Category: | [[Category: Lima CD]] | ||
