2fus: Difference between revisions

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-[[Image:2fus.gif|left|200px]]<br />
-<applet load="2fus" size="450" color="white" frame="true" align="right" spinBox="true"
-caption="2fus, resolution 2.2&Aring;" />
-'''MUTATIONS OF FUMARASE THAT DISTINGUISH BETWEEN THE ACTIVE SITE AND A NEARBY DICARBOXYLIC ACID BINDING SITE'''<br />
-==Overview==
+==MUTATIONS OF FUMARASE THAT DISTINGUISH BETWEEN THE ACTIVE SITE AND A NEARBY DICARBOXYLIC ACID BINDING SITE==
-Two mutant forms of fumarase C from E. coli have been made using PCR and, recombinant DNA. The recombinant form of the protein included a histidine, arm on the C-terminal facilitating purification. Based on earlier studies, two different carboxylic acid binding sites, labeled A- and B-, were, observed in crystal structures of the wild type and inhibited forms of the, enzyme. A histidine at each of the sites was mutated to an asparagine., H188N at the A-site resulted in a large decrease in specific activity, while the H129N mutation at the B-site had essentially no effect. From the, results, we conclude that the A-site is indeed the active site, and a dual, role for H188 as a potential catalytic base is proposed. Crystal, structures of the two mutant proteins produced some unexpected results., Both mutations reduced the affinity for the carboxylic acids at their, respective sites. The H129N mutant should be particularly useful in future, kinetic studies because it sterically blocks the B-site with the, carboxyamide of asparagine assuming the position of the ligand's, carboxylate. In the H188N mutation at the active site, the new asparagine, side chain still interacts with an active site water that appears to have, moved slightly as a result of the mutation.
+<StructureSection load='2fus' size='340' side='right'caption='[[2fus]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
+== Structural highlights ==
+<table><tr><td colspan='2'>[[2fus]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2FUS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2FUS 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]] 2.2&#8491;</td></tr>
+<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CIT:CITRIC+ACID'>CIT</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=2fus FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2fus OCA], [https://pdbe.org/2fus PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2fus RCSB], [https://www.ebi.ac.uk/pdbsum/2fus PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2fus ProSAT]</span></td></tr>
+</table>
+== Function ==
+[https://www.uniprot.org/uniprot/FUMC_ECOLI FUMC_ECOLI] Catalyzes the reversible addition of water to fumarate to give L-malate.<ref>PMID:1917897</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/fu/2fus_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=2fus ConSurf].
+<div style="clear:both"></div>
+<div style="background-color:#fffaf0;">
+== Publication Abstract from PubMed ==
+Two mutant forms of fumarase C from E. coli have been made using PCR and recombinant DNA. The recombinant form of the protein included a histidine arm on the C-terminal facilitating purification. Based on earlier studies, two different carboxylic acid binding sites, labeled A- and B-, were observed in crystal structures of the wild type and inhibited forms of the enzyme. A histidine at each of the sites was mutated to an asparagine. H188N at the A-site resulted in a large decrease in specific activity, while the H129N mutation at the B-site had essentially no effect. From the results, we conclude that the A-site is indeed the active site, and a dual role for H188 as a potential catalytic base is proposed. Crystal structures of the two mutant proteins produced some unexpected results. Both mutations reduced the affinity for the carboxylic acids at their respective sites. The H129N mutant should be particularly useful in future kinetic studies because it sterically blocks the B-site with the carboxyamide of asparagine assuming the position of the ligand's carboxylate. In the H188N mutation at the active site, the new asparagine side chain still interacts with an active site water that appears to have moved slightly as a result of the mutation.
-==About this Structure==
+Mutations of fumarase that distinguish between the active site and a nearby dicarboxylic acid binding site.,Weaver T, Lees M, Banaszak L Protein Sci. 1997 Apr;6(4):834-42. PMID:9098893<ref>PMID:9098893</ref>
-FUS is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with CIT as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Fumarate_hydratase Fumarate hydratase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.1.2 4.2.1.2] Structure known Active Site: S1. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2FUS OCA].
-==Reference==
+From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
-Mutations of fumarase that distinguish between the active site and a nearby dicarboxylic acid binding site., Weaver T, Lees M, Banaszak L, Protein Sci. 1997 Apr;6(4):834-42. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=9098893 9098893]
+</div>
+<div class="pdbe-citations 2fus" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[Fumarase|Fumarase]]
+== References ==
+<references/>
+__TOC__
+</StructureSection>
 [[Category: Escherichia coli]]
-[[Category: Fumarate hydratase]]
+[[Category: Large Structures]]
-[[Category: Single protein]]
+[[Category: Banaszak LJ]]
-[[Category: Banaszak, L.J.]]
+[[Category: Lees M]]
-[[Category: Lees, M.]]
+[[Category: Weaver TM]]
-[[Category: Weaver, T.M.]]
-[[Category: CIT]]
-[[Category: carbon oxygen lyase]]
-[[Category: fumarate hydratase]]
-[[Category: hydrolyase]]
-[[Category: kreb's cycle enzyme]]
-''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov  5 14:55:33 2007''