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==Biochemical and structural characterization of a novel 4-hydroxyphenylacetate-3-monooxygenase from Geobacillus mahadii Geo-05==
<StructureSection load='9lft' size='340' side='right'caption='[[9lft]], [[Resolution|resolution]] 2.40&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9lft]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Geobacillus Geobacillus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9LFT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9LFT 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]] 2.4&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PEU:2,5,8,11,14,17,20,23,26,29,32,35,38,41,44,47,50,53,56,59,62,65,68,71,74,77,80-HEPTACOSAOXADOOCTACONTAN-82-OL'>PEU</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=9lft FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9lft OCA], [https://pdbe.org/9lft PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9lft RCSB], [https://www.ebi.ac.uk/pdbsum/9lft PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9lft ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
4-Hydroxyphenylacetate-3-monooxygenase from the thermophilic bacterium Geobacillus mahadii Geo-05 catalyzes the hydroxylation of 4-hydroxyphenylacetate (4-HPA) to 3,4-dihydroxyphenylacetate (3,4-DHPA), marking the initial step of the 4-HPA degradation pathway. This enzyme comprises of two components: an oxygenase and reductase. In this study, the gene encoding the oxygenase component, GMHpaB was successfully cloned, overexpressed in Escherichia coli BL21 (DE3) and purified to homogeneity. Purified GMHpaB was shown to bind reduced chromogenic cofactors, evidenced by maximal absorbance peaks at 375 nm. GMHpaB is optimally active at 55 degrees C and demonstrates thermostability, retaining 96 % of its catalytic activity after 30 min of incubation at its optimum temperature. Furthermore, GMHpaB displays versatility, showing high enzymatic activity with both FMN and FAD as cofactors, with relative activity increases by 250 % and 383 %, respectively, compared to the cofactor-free control. The overall fold classifies GMHpaB as group D flavin-dependent monooxygenase, but distinct loop conformations set it apart from homologs within the group. Notably, residue Glu212, positioned on the substrate binding loop of GMHpaB plays a critical role in anchoring and stabilizing the flavin binding loop, potentially contributing to the enzymes dual cofactor compatibility. These biochemical and structural insights lay the groundwork for future applications, particularly in high-temperature biocatalysis.

Biochemical and structural insights into GMHpaB: A thermostable 4-Hydroxyphenylacetate-3-monooxygenase with dual cofactor versatility.,Che Husain NA, Padzil AM, Taib AZM, Zain NC, Bakar MFA, Gregory KS, Acharya KR, Jonet MA, Jamaluddin H Int J Biol Macromol. 2025 Sep;321(Pt 2):146065. doi: , 10.1016/j.ijbiomac.2025.146065. Epub 2025 Jul 17. PMID:40683498<ref>PMID:40683498</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 9lft" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Geobacillus]]
[[Category: Large Structures]]
[[Category: Acharya KR]]
[[Category: Bakar MFA]]
[[Category: Che Husain NA]]
[[Category: Gregory KS]]
[[Category: Jamaluddin H]]
[[Category: Jonet MA]]
[[Category: Padzil AM]]
[[Category: Taib AZM]]
[[Category: Zain NC]]