1ll7: Difference between revisions

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-[[Image:1ll7.gif|left|200px]]
-<!--
-The line below this paragraph, containing "STRUCTURE_1ll7", creates the "Structure Box" on the page.
-You may change the PDB parameter (which sets the PDB file loaded into the applet)
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-{{STRUCTURE_1ll7|  PDB=1ll7  |  SCENE=  }}
-'''STRUCTURE OF THE E171Q MUTANT OF C. IMMITIS CHITINASE 1'''
+==STRUCTURE OF THE E171Q MUTANT OF C. IMMITIS CHITINASE 1==
+<StructureSection load='1ll7' size='340' side='right'caption='[[1ll7]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
+== Structural highlights ==
+<table><tr><td colspan='2'>[[1ll7]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Coccidioides_immitis Coccidioides immitis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LL7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1LL7 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]] 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=1ll7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ll7 OCA], [https://pdbe.org/1ll7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ll7 RCSB], [https://www.ebi.ac.uk/pdbsum/1ll7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ll7 ProSAT]</span></td></tr>
+</table>
+== Function ==
+[https://www.uniprot.org/uniprot/CHI1_COCPS CHI1_COCPS]
+== 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/ll/1ll7_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=1ll7 ConSurf].
+<div style="clear:both"></div>
+<div style="background-color:#fffaf0;">
+== Publication Abstract from PubMed ==
+Allosamidin is a known inhibitor of class 18 chitinases. We show that allosamidin is a competitive inhibitor of the fungal chitinase CiX1 from Coccidioides immitis, with a K(i) of 60 nM. We report the X-ray structure of the complex and show that upon inhibitor binding the side-chain of Asp169 rotates to form an ion pair with the oxazolinium cation. The mechanism of action is thought to involve protonation of the leaving group by Glu171 and substrate assistance by the sugar acetamido moiety to form an oxazoline-like intermediate. We converted both amino acid residues to the corresponding amide and found that each mutation effectively abolishes enzyme activity. X-ray structures show the mutant enzymes retain the basic wild-type structure and that the loss of mutant activity is due to their altered chemical properties. The high affinity of allosamidin, and its similarity to the putative reaction intermediate, suggests it is a transition state analog. This helps validate our contention that the role of Asp169 is to electrostatically stabilize the reaction transition state.
-==Overview==
+The structure of an allosamidin complex with the Coccidioides immitis chitinase defines a role for a second acid residue in substrate-assisted mechanism.,Bortone K, Monzingo AF, Ernst S, Robertus JD J Mol Biol. 2002 Jul 5;320(2):293-302. PMID:12079386<ref>PMID:12079386</ref>
-Allosamidin is a known inhibitor of class 18 chitinases. We show that allosamidin is a competitive inhibitor of the fungal chitinase CiX1 from Coccidioides immitis, with a K(i) of 60 nM. We report the X-ray structure of the complex and show that upon inhibitor binding the side-chain of Asp169 rotates to form an ion pair with the oxazolinium cation. The mechanism of action is thought to involve protonation of the leaving group by Glu171 and substrate assistance by the sugar acetamido moiety to form an oxazoline-like intermediate. We converted both amino acid residues to the corresponding amide and found that each mutation effectively abolishes enzyme activity. X-ray structures show the mutant enzymes retain the basic wild-type structure and that the loss of mutant activity is due to their altered chemical properties. The high affinity of allosamidin, and its similarity to the putative reaction intermediate, suggests it is a transition state analog. This helps validate our contention that the role of Asp169 is to electrostatically stabilize the reaction transition state.
-==About this Structure==
+From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
-LL7 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Coccidioides_immitis Coccidioides immitis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1LL7 OCA].
+</div>
+<div class="pdbe-citations 1ll7" style="background-color:#fffaf0;"></div>
-==Reference==
+==See Also==
-The structure of an allosamidin complex with the Coccidioides immitis chitinase defines a role for a second acid residue in substrate-assisted mechanism., Bortone K, Monzingo AF, Ernst S, Robertus JD, J Mol Biol. 2002 Jul 5;320(2):293-302. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12079386 12079386]
+*[[Chitinase 3D structures|Chitinase 3D structures]]
-[[Category: Chitinase]]
+== References ==
+<references/>
+__TOC__
+</StructureSection>
 [[Category: Coccidioides immitis]]
-[[Category: Single protein]]
+[[Category: Large Structures]]
-[[Category: Bortone, K.]]
+[[Category: Bortone K]]
-[[Category: Ernst, S.]]
+[[Category: Ernst S]]
-[[Category: Monzingo, A F.]]
+[[Category: Monzingo AF]]
-[[Category: Robertus, J D.]]
+[[Category: Robertus JD]]
-[[Category: Beta-alpha barrel]]
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 00:01:50 2008''