View source for 9ujd


==Crystal structure of a Transaminase PaTA from Pseudonocardia ammonioxydans in complex with PLP and LLP==
<StructureSection load='9ujd' size='340' side='right'caption='[[9ujd]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9ujd]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Pseudonocardia Pseudonocardia]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9UJD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9UJD 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]] 2.8&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=LLP:(2S)-2-AMINO-6-[[3-HYDROXY-2-METHYL-5-(PHOSPHONOOXYMETHYL)PYRIDIN-4-YL]METHYLIDENEAMINO]HEXANOIC+ACID'>LLP</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=9ujd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9ujd OCA], [https://pdbe.org/9ujd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9ujd RCSB], [https://www.ebi.ac.uk/pdbsum/9ujd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9ujd ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A1I5HJ61_PSUAM A0A1I5HJ61_PSUAM] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
R-transaminases show significant promise for the industrial synthesis of chiral amine pharmaceutical intermediates. However, the application is hindered by limited substrate acceptance and poor catalytic efficiency toward bulky substrates. Herein, the R-transaminase from Pseudonocardia ammonioxydans (PaTA) with the high activity towards the mexiletine precursor ketone (1c) was identified, and its crystal structure was resolved (PDB: 9UJD). Substrate specificity analysis revealed that PaTA exhibited obvious substrate preference for aryl-substituted phenoxyacetones (1c-16c). Based on the crystal structure, key sites affecting substrate selectivity were identified, followed by multiple rounds of engineering that yielded a series of variants with enhanced catalytic performance. Ultimately, the gram-scale synthesis of R-1d and 12d was conducted, achieving the space-time yields (STY) of 24 and 32 g/L.h, respectively. This study provides practical biocatalysts for the synthesis of chiral beta-amino aryl ethers, along with insights into the relationship between the enzyme-substrate binding pocket and substrate selectivity.

Rational engineering of R-selective transaminase from Pseudonocardia ammonioxydans for efficient synthesis of chiral beta-amino aryl ethers.,Gao X, Zhang W, Wang Q, Zhang Z, Wei H, Wei X, Zhao L, Liu W, Jia X, You S Bioresour Technol. 2025 Dec 15;443:133802. doi: 10.1016/j.biortech.2025.133802. PMID:41407049<ref>PMID:41407049</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 9ujd" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Pseudonocardia]]
[[Category: Liang X]]
[[Category: Liu WD]]
[[Category: Wei HL]]
[[Category: You S]]
[[Category: Zhang ZB]]