View source for 4adb


==Structural and functional study of succinyl-ornithine transaminase from E. coli==
<StructureSection load='4adb' size='340' side='right'caption='[[4adb]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4adb]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_BL21 Escherichia coli BL21]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4ADB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4ADB 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=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=PLP:PYRIDOXAL-5-PHOSPHATE'>PLP</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=4adb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4adb OCA], [https://pdbe.org/4adb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4adb RCSB], [https://www.ebi.ac.uk/pdbsum/4adb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4adb ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ASTC_ECOLI ASTC_ECOLI] Catalyzes the transamination of N(2)-succinylornithine and alpha-ketoglutarate into N(2)-succinylglutamate semialdehyde and glutamate. Can also act as an acetylornithine aminotransferase.<ref>PMID:9696779</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
possesses two acyl ornithine aminotransferases, one catabolic (AstC) and the other anabolic (ArgD), that participate in L-arginine metabolism. Although only 58% identical, the enzymes have been shown to be functionally interchangeable. Here we have purified AstC and have obtained X-ray crystal structures of apo and holo-AstC and of the enzyme complexed with its physiological substrate, succinylornithine. We compare the structures obtained in this study with those of ArgD from obtained elsewhere, finding several notable differences. Docking studies were used to explore the docking modes of several substrates (ornithine, succinylornithine and acetylornithine) and the co-substrate glutamate/alpha-ketogluterate. The docking studies support our observations that AstC has a strong preference for acylated ornithine species over ornithine itself, and suggest that the increase in specificity associated with acylation is caused by steric and desolvation effects rather than specific interactions between the substrate and enzyme.

Determination of the Structure of the Catabolic N-Succinylornithine Transaminase (AstC) from Escherichia coli.,Newman J, Seabrook S, Surjadi R, Williams CC, Lucent D, Wilding M, Scott C, Peat TS PLoS One. 2013;8(3):e58298. doi: 10.1371/journal.pone.0058298. Epub 2013 Mar 6. PMID:23484010<ref>PMID:23484010</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4adb" style="background-color:#fffaf0;"></div>

==See Also==
*[[Aminotransferase 3D structures|Aminotransferase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli BL21]]
[[Category: Large Structures]]
[[Category: Newman J]]
[[Category: Peat TS]]