2h54: Difference between revisions

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-[[Image:2h54.png|left|200px]]
-<!--
+==Crystal structure of human caspase-1 (Thr388->Ala) in complex with 3-[2-(2-benzyloxycarbonylamino-3-methyl-butyrylamino)-propionylamino]-4-oxo-pentanoic acid (z-VAD-FMK)==
-The line below this paragraph, containing "STRUCTURE_2h54", creates the "Structure Box" on the page.
+<StructureSection load='2h54' size='340' side='right'caption='[[2h54]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
-You may change the PDB parameter (which sets the PDB file loaded into the applet)
+== Structural highlights ==
-or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
+<table><tr><td colspan='2'>[[2h54]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2H54 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2H54 FirstGlance]. <br>
-or leave the SCENE parameter empty for the default display.
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.8&#8491;</td></tr>
--->
+<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CF0:FLUOROMETHANE'>CF0</scene>, <scene name='pdbligand=PHQ:BENZYL+CHLOROCARBONATE'>PHQ</scene></td></tr>
-{{STRUCTURE_2h54|  PDB=2h54  |  SCENE=  }}
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2h54 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2h54 OCA], [https://pdbe.org/2h54 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2h54 RCSB], [https://www.ebi.ac.uk/pdbsum/2h54 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2h54 ProSAT]</span></td></tr>
+</table>
+== Function ==
+[https://www.uniprot.org/uniprot/CASP1_HUMAN CASP1_HUMAN] Thiol protease that cleaves IL-1 beta between an Asp and an Ala, releasing the mature cytokine which is involved in a variety of inflammatory processes. Important for defense against pathogens. Cleaves and activates sterol regulatory element binding proteins (SREBPs). Can also promote apoptosis.<ref>PMID:7876192</ref> <ref>PMID:15498465</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/h5/2h54_consurf.spt"</scriptWhenChecked>
+    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=2h54 ConSurf].
+<div style="clear:both"></div>
+<div style="background-color:#fffaf0;">
+== Publication Abstract from PubMed ==
+Structural studies of caspase-1 reveal that the dimeric thiol protease can exist in two states: in an on-state, when the active site is occupied, or in an off-state, when the active site is empty or when the enzyme is bound by a synthetic allosteric ligand at the dimer interface approximately 15 A from the active site. A network of 21 hydrogen bonds from nine side chains connecting the active and allosteric sites change partners when going between the on-state and the off-state. Alanine-scanning mutagenesis of these nine side chains shows that only two of them-Arg286 and Glu390, which form a salt bridge-have major effects, causing 100- to 200-fold reductions in catalytic efficiency (k(cat)/K(m)). Two neighbors, Ser332 and Ser339, have minor effects, causing 4- to 7-fold reductions. A more detailed mutational analysis reveals that the enzyme is especially sensitive to substitutions of the salt bridge: even a homologous R286K substitution causes a 150-fold reduction in k(cat)/K(m). X-ray crystal structures of these variants suggest the importance of both the salt bridge interaction and the coordination of solvent water molecules near the allosteric binding pocket. Thus, only a small subset of side chains from the larger hydrogen bonding network is critical for activity. These form a contiguous set of interactions that run from one active site through the allosteric site at the dimer interface and onto the second active site. This subset constitutes a functional allosteric circuit or "hot wire" that promotes site-to-site coupling.
-===Crystal structure of human caspase-1 (Thr388->Ala) in complex with 3-[2-(2-benzyloxycarbonylamino-3-methyl-butyrylamino)-propionylamino]-4-oxo-pentanoic acid (z-VAD-FMK)===
+An allosteric circuit in caspase-1.,Datta D, Scheer JM, Romanowski MJ, Wells JA J Mol Biol. 2008 Sep 19;381(5):1157-67. Epub 2008 Jun 20. PMID:18590738<ref>PMID:18590738</ref>
+From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
-<!--
+</div>
-The line below this paragraph, {{ABSTRACT_PUBMED_18590738}}, adds the Publication Abstract to the page
+<div class="pdbe-citations 2h54" style="background-color:#fffaf0;"></div>
-(as it appears on PubMed at http://www.pubmed.gov), where 18590738 is the PubMed ID number.
--->
-{{ABSTRACT_PUBMED_18590738}}
-==About this Structure==
-[[2h54]] is a 3 chain structure of [[Caspase]] with sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2H54 OCA].
 ==See Also==
-*[[Caspase|Caspase]]
+*[[Caspase 3D structures|Caspase 3D structures]]
+== References ==
-==Reference==
+<references/>
-<ref group="xtra">PMID:018590738</ref><references group="xtra"/>
+__TOC__
-[[Category: Caspase-1]]
+</StructureSection>
 [[Category: Homo sapiens]]
-[[Category: Romanowski, M J.]]
+[[Category: Large Structures]]
-[[Category: Scheer, J M.]]
+[[Category: Romanowski MJ]]
-[[Category: Wells, J A.]]
+[[Category: Scheer JM]]
-[[Category: Allosteric site]]
+[[Category: Wells JA]]
-[[Category: Dimer interface]]
-[[Category: Hydrolase]]
-[[Category: Hydrolase-hydrolase inhibitor complex]]