View source for 5etk


==E. coli 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase complexed with AMPCPP and inhibitor at 1.09 angstrom resolution==
<StructureSection load='5etk' size='340' side='right'caption='[[5etk]], [[Resolution|resolution]] 1.09&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5etk]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5ETK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5ETK 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]] 1.09&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=5RU:2-AZANYL-8-[(2-FLUOROPHENYL)METHYLSULFANYL]-1,9-DIHYDROPURIN-6-ONE'>5RU</scene>, <scene name='pdbligand=APC:DIPHOSPHOMETHYLPHOSPHONIC+ACID+ADENOSYL+ESTER'>APC</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</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=5etk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5etk OCA], [https://pdbe.org/5etk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5etk RCSB], [https://www.ebi.ac.uk/pdbsum/5etk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5etk ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/HPPK_ECOLI HPPK_ECOLI] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
6-Hydroxymethyl-7,8-dihydropterin pyrophosphokinase (HPPK) is a member of the folate biosynthesis pathway found in prokaryotes and lower eukaryotes that catalyzes the pyrophosphoryl transfer from the ATP cofactor to a 6-hydroxymethyl-7,8-dihydropterin substrate. We report the chemical synthesis of a series of S-functionalized 8-mercaptoguanine (8MG) analogues as substrate site inhibitors of HPPK and quantify binding against the E. coli and S. aureus enzymes (EcHPPK and SaHPPK). The results demonstrate that analogues incorporating acetophenone-based substituents have comparable affinities for both enzymes. Preferential binding of benzyl-substituted 8MG derivatives to SaHPPK was reconciled when a cryptic pocket unique to SaHPPK was revealed by X-ray crystallography. Differential chemical shift perturbation analysis confirmed this to be a common mode of binding for this series to SaHPPK. One compound (41) displayed binding affinities of 120 nM and 1.76 muM for SaHPPK and EcHPPK, respectively, and represents a lead for the development of more potent and selective inhibitors of SaHPPK.

Structural Basis for the Selective Binding of Inhibitors to 6-Hydroxymethyl-7,8-dihydropterin Pyrophosphokinase from Staphylococcus aureus and Escherichia coli.,Dennis ML, Pitcher NP, Lee MD, DeBono AJ, Wang ZC, Harjani JR, Rahmani R, Cleary B, Peat TS, Baell JB, Swarbrick JD J Med Chem. 2016 Apr 26. PMID:27094768<ref>PMID:27094768</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5etk" style="background-color:#fffaf0;"></div>

==See Also==
*[[HPPK 3D structures|HPPK 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli]]
[[Category: Large Structures]]
[[Category: Dennis ML]]
[[Category: Peat TS]]
[[Category: Swarbrick JD]]