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[[Image:2f8t.gif|left|200px]]
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{{STRUCTURE_2f8t|  PDB=2f8t  |  SCENE=  }}
'''Crystal structure of Aa-Ago with externally-bound siRNA'''


==Crystal structure of Aa-Ago with externally-bound siRNA==
<StructureSection load='2f8t' size='340' side='right'caption='[[2f8t]], [[Resolution|resolution]] 3.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2f8t]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Aquifex_aeolicus Aquifex aeolicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2F8T OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2F8T 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]] 3.1&#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=2f8t FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2f8t OCA], [https://pdbe.org/2f8t PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2f8t RCSB], [https://www.ebi.ac.uk/pdbsum/2f8t PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2f8t ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/O67434_AQUAE O67434_AQUAE]
== 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/f8/2f8t_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=2f8t ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Argonaute proteins are key components of the RNA-induced silencing complex (RISC). They provide both architectural and catalytic functionalities associated with small interfering RNA (siRNA) guide strand recognition and subsequent guide strand-mediated cleavage of complementary mRNAs. We report on the 3.0 A crystal structures of 22-mer and 26-mer siRNAs bound to Aquifex aeolicus Argonaute (Aa-Ago), where one 2 nt 3' overhang of the siRNA inserts into a cavity positioned on the outer surface of the PAZ-containing lobe of the bilobal Aa-Ago architecture. The first overhang nucleotide stacks over a tyrosine ring, while the second overhang nucleotide, together with the intervening sugar-phosphate backbone, inserts into a preformed surface cavity. Photochemical crosslinking studies on Aa-Ago with 5-iodoU-labeled single-stranded siRNA and siRNA duplex provide support for this externally bound siRNA-Aa-Ago complex. The structure and biochemical data together provide insights into a protein-RNA recognition event potentially associated with the RISC-loading pathway.


==Overview==
A potential protein-RNA recognition event along the RISC-loading pathway from the structure of A. aeolicus Argonaute with externally bound siRNA.,Yuan YR, Pei Y, Chen HY, Tuschl T, Patel DJ Structure. 2006 Oct;14(10):1557-65. PMID:17027504<ref>PMID:17027504</ref>
Argonaute proteins are key components of the RNA-induced silencing complex (RISC). They provide both architectural and catalytic functionalities associated with small interfering RNA (siRNA) guide strand recognition and subsequent guide strand-mediated cleavage of complementary mRNAs. We report on the 3.0 A crystal structures of 22-mer and 26-mer siRNAs bound to Aquifex aeolicus Argonaute (Aa-Ago), where one 2 nt 3' overhang of the siRNA inserts into a cavity positioned on the outer surface of the PAZ-containing lobe of the bilobal Aa-Ago architecture. The first overhang nucleotide stacks over a tyrosine ring, while the second overhang nucleotide, together with the intervening sugar-phosphate backbone, inserts into a preformed surface cavity. Photochemical crosslinking studies on Aa-Ago with 5-iodoU-labeled single-stranded siRNA and siRNA duplex provide support for this externally bound siRNA-Aa-Ago complex. The structure and biochemical data together provide insights into a protein-RNA recognition event potentially associated with the RISC-loading pathway.


==About this Structure==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
2F8T is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Aquifex_aeolicus Aquifex aeolicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2F8T OCA].
</div>
<div class="pdbe-citations 2f8t" style="background-color:#fffaf0;"></div>


==Reference==
==See Also==
A potential protein-RNA recognition event along the RISC-loading pathway from the structure of A. aeolicus Argonaute with externally bound siRNA., Yuan YR, Pei Y, Chen HY, Tuschl T, Patel DJ, Structure. 2006 Oct;14(10):1557-65. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17027504 17027504]
*[[Argonaute 3D structures|Argonaute 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Aquifex aeolicus]]
[[Category: Aquifex aeolicus]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Chen, H Y.]]
[[Category: Chen HY]]
[[Category: Patel, D J.]]
[[Category: Patel DJ]]
[[Category: Yuan, Y R.]]
[[Category: Yuan YR]]
[[Category: Argonaute]]
[[Category: Risc loading complex]]
[[Category: Sirna]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May  4 03:35:59 2008''

Latest revision as of 09:22, 30 August 2023

Crystal structure of Aa-Ago with externally-bound siRNA

2f8t, resolution 3.10Å

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