View source for 4yl5


==Structure of a putative phosphomethylpyrimidine kinase from Acinetobacter baumannii==
<StructureSection load='4yl5' size='340' side='right'caption='[[4yl5]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4yl5]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Acinetobacter_baumannii_IS-123 Acinetobacter baumannii IS-123]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4YL5 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4YL5 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]] 1.7&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</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=4yl5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4yl5 OCA], [https://pdbe.org/4yl5 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4yl5 RCSB], [https://www.ebi.ac.uk/pdbsum/4yl5 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4yl5 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A0J9X285_ACIBA A0A0J9X285_ACIBA] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Thiamin and its phosphate derivatives are ubiquitous molecules involved as essential cofactors in many cellular processes. The de novo biosynthesis of thiamin employs the parallel synthesis of 4-methyl-5-(2-hydroxyethyl)thiazole (THZ-P) and 4-amino-2-methyl-5(diphosphooxymethyl) pyrimidine (HMP) pyrophosphate (HMP-PP), which are coupled to generate thiamin phosphate. Most organisms that can biosynthesize thiamin employ a kinase (HMPK or ThiD) to generate HMP-PP. In nearly all cases, this enzyme is bifunctional and can also salvage free HMP, producing HMP-P, the monophosphate precursor of HMP-PP. Here we present high-resolution crystal structures of an HMPK from Acinetobacter baumannii (AbHMPK), both unliganded and with pyridoxal 5-phosphate (PLP) noncovalently bound. Despite the similarity between HMPK and pyridoxal kinase enzymes, our kinetics analysis indicates that AbHMPK accepts HMP exclusively as a substrate and cannot turn over pyridoxal, pyridoxamine, or pyridoxine nor does it display phosphatase activity. PLP does, however, act as a weak inhibitor of AbHMPK with an IC(50) of 768 muM. Surprisingly, unlike other HMPKs, AbHMPK catalyzes only the phosphorylation of HMP and does not generate the diphosphate HMP-PP. This suggests that an additional kinase is present in A. baumannii, or an alternative mechanism is in operation to complete the biosynthesis of thiamin.

Characterization of an Acinetobacter baumannii Monofunctional Phosphomethylpyrimidine Kinase That Is Inhibited by Pyridoxal Phosphate.,De Vitto H, Belfon KKJ, Sharma N, Toay S, Abendroth J, Dranow DM, Lukacs CM, Choi R, Udell HS, Willis S, Barrera G, Beyer O, Li TD, Hicks KA, Torelli AT, French JB Biochemistry. 2024 Feb 2. doi: 10.1021/acs.biochem.3c00640. PMID:38306231<ref>PMID:38306231</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4yl5" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Acinetobacter baumannii IS-123]]
[[Category: Large Structures]]