1k32: Difference between revisions

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-[[Image:1k32.gif|left|200px]]<br /><applet load="1k32" size="350" color="white" frame="true" align="right" spinBox="true"
-caption="1k32, resolution 2.0&Aring;" />
-'''Crystal structure of the tricorn protease'''<br />
-==Overview==
+==Crystal structure of the tricorn protease==
-The degradation of cytosolic proteins is carried out predominantly by the proteasome, which generates peptides of 7-9 amino acids long. These products need further processing. Recently, a proteolytic system was identified in the model organism Thermoplasma acidophilum that performs this processing. The hexameric core protein of this modular system, referred to as tricorn protease, is a 720K protease that is able to assemble further into a giant icosahedral capsid, as determined by electron microscopy. Here, we present the crystal structure of the tricorn protease at 2.0 A resolution. The structure reveals a complex mosaic protein whereby five domains combine to form one of six subunits, which further assemble to form the 3-2-symmetric core protein. The structure shows how the individual domains coordinate the specific steps of substrate processing, including channelling of the substrate to, and the product from, the catalytic site. Moreover, the structure shows how accessory protein components might contribute to an even more complex protein machinery that efficiently collects the tricorn-released products.
+<StructureSection load='1k32' size='340' side='right'caption='[[1k32]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
+== Structural highlights ==
-==About this Structure==
+<table><tr><td colspan='2'>[[1k32]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermoplasma_acidophilum Thermoplasma acidophilum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1K32 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1K32 FirstGlance]. <br>
-K32 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Thermoplasma_acidophilum Thermoplasma acidophilum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1K32 OCA].
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2&#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=1k32 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1k32 OCA], [https://pdbe.org/1k32 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1k32 RCSB], [https://www.ebi.ac.uk/pdbsum/1k32 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1k32 ProSAT]</span></td></tr>
-==Reference==
+</table>
-Crystal structure of the tricorn protease reveals a protein disassembly line., Brandstetter H, Kim JS, Groll M, Huber R, Nature. 2001 Nov 22;414(6862):466-70. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=11719810 11719810]
+== Function ==
-[[Category: Single protein]]
+[https://www.uniprot.org/uniprot/TRI_THEAC TRI_THEAC] Tricorn degrades oligopeptides (probably derived from the proteasome) and channels the products to F1, F2 and F3 proteases, which then catalyze the terminal degradation step, yielding free amino acids.
+== 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/k3/1k32_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=1k32 ConSurf].
+<div style="clear:both"></div>
+__TOC__
+</StructureSection>
+[[Category: Large Structures]]
 [[Category: Thermoplasma acidophilum]]
-[[Category: Brandstetter, H.]]
+[[Category: Brandstetter H]]
-[[Category: Groll, M.]]
+[[Category: Groll M]]
-[[Category: Huber, R.]]
+[[Category: Huber R]]
-[[Category: Kim, J S.]]
+[[Category: Kim J-S]]
-[[Category: beta propeller]]
-[[Category: proteasome]]
-[[Category: protein degradation]]
-[[Category: serine protease]]
-[[Category: substrate gating]]
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:29:31 2008''