View source for 4rkd


==Psychrophilic aromatic amino acids aminotransferase from Psychrobacter sp. B6 cocrystalized with aspartic acid==
<StructureSection load='4rkd' size='340' side='right'caption='[[4rkd]], [[Resolution|resolution]] 2.76&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4rkd]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Psychrobacter_sp._B6 Psychrobacter sp. B6]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4RKD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4RKD 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]] 2.76&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=KET:2-[(3-HYDROXY-2-METHYL-5-PHOSPHONOOXYMETHYL-PYRIDIN-4-YLMETHYLENE)-AMINO]-SUCCINIC+ACID'>KET</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=OAA:OXALOACETATE+ION'>OAA</scene>, <scene name='pdbligand=PLP:PYRIDOXAL-5-PHOSPHATE'>PLP</scene>, <scene name='pdbligand=PMP:4-DEOXY-4-AMINOPYRIDOXAL-5-PHOSPHATE'>PMP</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=4rkd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4rkd OCA], [https://pdbe.org/4rkd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4rkd RCSB], [https://www.ebi.ac.uk/pdbsum/4rkd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4rkd ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/C7E5X4_9GAMM C7E5X4_9GAMM] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Aminotransferases (ATs) are enzymes that are commonly used in the chemical and pharmaceutical industries for the synthesis of natural and non-natural amino acids by transamination reactions. Currently, the easily accessible enzymes from mesophilic organisms are most commonly used; however, for economical and ecological reasons the utilization of aminotransferases from psychrophiles would be more advantageous, as their optimum reaction temperature is usually significantly lower than for the mesophilic ATs. Here, gene isolation, protein expression, purification, enzymatic properties and structural studies are reported for the cold-active aromatic amino-acid aminotransferase (PsyArAT) from Psychrobacter sp. B6, a psychrotrophic, Gram-negative strain from Antarctic soil. Preliminary computational analysis indicated dual functionality of the enzyme through the ability to utilize both aromatic amino acids and aspartate as substrates. This postulation was confirmed by enzymatic activity tests, which showed that it belonged to the class EC 2.6.1.57. The first crystal structures of a psychrophilic aromatic amino-acid aminotransferase have been determined at resolutions of 2.19 A for the native enzyme (PsyArAT) and 2.76 A for its complex with aspartic acid (PsyArAT/D). Both types of crystals grew in the monoclinic space group P21 under slightly different crystallization conditions. The PsyArAT crystals contained a dimer (90 kDa) in the asymmetric unit, which corresponds to the active form of this enzyme, whereas the crystals of the PsyArAT/D complex included four dimers showing different stages of the transamination reaction.

Crystal structure and enzymatic properties of a broad substrate-specificity psychrophilic aminotransferase from the Antarctic soil bacterium Psychrobacter sp. B6.,Bujacz A, Rutkiewicz-Krotewicz M, Nowakowska-Sapota K, Turkiewicz M Acta Crystallogr D Biol Crystallogr. 2015 Mar 1;71(Pt 3):632-45. doi:, 10.1107/S1399004714028016. Epub 2015 Feb 26. PMID:25760611<ref>PMID:25760611</ref>

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

==See Also==
*[[Aminotransferase 3D structures|Aminotransferase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Psychrobacter sp. B6]]
[[Category: Bujacz A]]
[[Category: Bujacz G]]
[[Category: Nowakowska-Sapota K]]
[[Category: Rutkiewicz-Krotewicz M]]
[[Category: Turkiewicz M]]