View source for 1iru


==Crystal Structure of the mammalian 20S proteasome at 2.75 A resolution==
<StructureSection load='1iru' size='340' side='right'caption='[[1iru]], [[Resolution|resolution]] 2.75&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1iru]] is a 28 chain structure with sequence from [https://en.wikipedia.org/wiki/Bovin Bovin]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IRU OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1IRU FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></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=1iru FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1iru OCA], [https://pdbe.org/1iru PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1iru RCSB], [https://www.ebi.ac.uk/pdbsum/1iru PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1iru ProSAT]</span></td></tr>
</table>
== Function ==
[[https://www.uniprot.org/uniprot/PSB3_BOVIN PSB3_BOVIN]] The proteasome is a multicatalytic proteinase complex which is characterized by its ability to cleave peptides with Arg, Phe, Tyr, Leu, and Glu adjacent to the leaving group at neutral or slightly basic pH. The proteasome has an ATP-dependent proteolytic activity. 
== 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/ir/1iru_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=1iru ConSurf].
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== Publication Abstract from PubMed ==
The 20S proteasome is the catalytic portion of the 26S proteasome. Constitutively expressed mammalian 20S proteasomes have three active subunits, beta 1, beta 2, and beta 5, which are replaced in the immunoproteasome by interferon-gamma-inducible subunits beta 1i, beta 2i, and beta 5i, respectively. Here we determined the crystal structure of the bovine 20S proteasome at 2.75 A resolution. The structures of alpha 2, beta 1, beta 5, beta 6, and beta 7 subunits of the bovine enzyme were different from the yeast enzyme but enabled the bovine proteasome to accommodate either the constitutive or the inducible subunits. A novel N-terminal nucleophile hydrolase activity was proposed for the beta 7 subunit. We also determined the site of the nuclear localization signals in the molecule. A model of the immunoproteasome was predicted from this constitutive structure.

The structure of the mammalian 20S proteasome at 2.75 A resolution.,Unno M, Mizushima T, Morimoto Y, Tomisugi Y, Tanaka K, Yasuoka N, Tsukihara T Structure. 2002 May;10(5):609-18. PMID:12015144<ref>PMID:12015144</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1iru" style="background-color:#fffaf0;"></div>

==See Also==
*[[Proteasome 3D structures|Proteasome 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bovin]]
[[Category: Large Structures]]
[[Category: Mizushima, T]]
[[Category: Morimoto, Y]]
[[Category: Tanaka, K]]
[[Category: Tomisugi, Y]]
[[Category: Tsukihara, T]]
[[Category: Unno, M]]
[[Category: Yasuoka, N]]
[[Category: 20s proteasome]]
[[Category: Cell cycle]]
[[Category: Hydrolase]]
[[Category: Immune response]]
[[Category: Proteolysis]]
[[Category: Ubiquitin]]