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4gsm
From Proteopedia
(Difference between revisions)
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== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[4gsm]] is a 2 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=4GSM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4GSM FirstGlance]. <br> | <table><tr><td colspan='2'>[[4gsm]] is a 2 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=4GSM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4GSM FirstGlance]. <br> | ||
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NI:NICKEL+(II)+ION'>NI</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.7Å</td></tr> |
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NI:NICKEL+(II)+ION'>NI</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=4gsm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4gsm OCA], [https://pdbe.org/4gsm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4gsm RCSB], [https://www.ebi.ac.uk/pdbsum/4gsm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4gsm ProSAT]</span></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=4gsm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4gsm OCA], [https://pdbe.org/4gsm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4gsm RCSB], [https://www.ebi.ac.uk/pdbsum/4gsm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4gsm ProSAT]</span></td></tr> | ||
</table> | </table> | ||
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== Function == | == Function == | ||
[https://www.uniprot.org/uniprot/ARGI1_HUMAN ARGI1_HUMAN] | [https://www.uniprot.org/uniprot/ARGI1_HUMAN ARGI1_HUMAN] | ||
| - | <div style="background-color:#fffaf0;"> | ||
| - | == Publication Abstract from PubMed == | ||
| - | Various binuclear metal ion clusters and complexes have been reconstituted in crystalline human arginase I by removing the Mn(2+)(2) cluster of the wild-type enzyme with metal chelators and subsequently soaking the crystalline apoenzyme in buffer solutions containing NiCl(2) or ZnCl(2). X-ray crystal structures of these metal ion variants are correlated with catalytic activity measurements that reveal differences resulting from metal ion substitution. Additionally, treatment of crystalline Mn(2+)(2)-human arginase I with Zn(2+) reveals for the first time the structural basis for inhibition by Zn(2+), which forms a carboxylate-histidine-Zn(2+) triad with H141 and E277. The imidazole side chain of H141 is known to be hyper-reactive, and its chemical modification or mutagenesis is known to similarly compromise catalysis. The reactive substrate analogue 2(S)-amino-6-boronohexanoic acid (ABH) binds as a tetrahedral boronate anion to Mn(2+)(2), Co(2+)(2), Ni(2+)(2), and Zn(2+)(2) clusters in human arginase I, and it can be stabilized by a third inhibitory Zn(2+) ion coordinated by H141. Because ABH binds as an analogue of the tetrahedral intermediate and its flanking transition states in catalysis, this implies that the various metallo-substituted enzymes are capable of some level of catalysis with an actual substrate. Accordingly, we establish the following trend for turnover number (k(cat)) and catalytic efficiency (k(cat)/K(M)): Mn(2+) > Ni(2+) approximately Co(2+) >> Zn(2+). Therefore, Mn(2+) is required for optimal catalysis by human arginase I. | ||
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| - | Structure and function of non-native metal clusters in human arginase I.,D'Antonio EL, Hai Y, Christianson DW Biochemistry. 2012 Oct 23;51(42):8399-409. doi: 10.1021/bi301145n. Epub 2012 Oct , 12. PMID:23061982<ref>PMID:23061982</ref> | ||
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| - | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
| - | </div> | ||
| - | <div class="pdbe-citations 4gsm" style="background-color:#fffaf0;"></div> | ||
==See Also== | ==See Also== | ||
Current revision
Crystal Structure of Ni2+2-Human Arginase I
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