View source for 6gi0


==Crystal structure of the ferric enterobactin esterase (PfeE) from Pseudomonas aeruginosa==
<StructureSection load='6gi0' size='340' side='right' caption='[[6gi0]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6gi0]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_aeruginosus"_(schroeter_1872)_trevisan_1885 "bacillus aeruginosus" (schroeter 1872) trevisan 1885]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6GI0 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6GI0 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=NO3:NITRATE+ION'>NO3</scene></td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">PA2689 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=287 "Bacillus aeruginosus" (Schroeter 1872) Trevisan 1885])</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6gi0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6gi0 OCA], [http://pdbe.org/6gi0 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6gi0 RCSB], [http://www.ebi.ac.uk/pdbsum/6gi0 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6gi0 ProSAT]</span></td></tr>
</table>
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== Publication Abstract from PubMed ==
Enterobactin (ENT) is a siderophore (iron-chelating compound) produced by Escherichia coli in order to gain access to iron, an essential nutriment for bacterial growth. ENT is used as an exosiderophore by the opportunistic human pathogen Pseudomonas aeruginosa with transport of ferri-ENT across the bacterial outer membrane by the transporter PfeA. Next to pfeA gene on the chromosome is localized a gene encoding for an esterase, PfeE, whose transcription is regulated, as for pfeA, by the presence of ENT in bacterial environment. Purified PfeE hydrolyzed ferri-ENT into three molecules of 2,3 DHBS (2,3 dihydroxybenzoylserine) still complexed with ferric iron, and complete dissociation of iron from ENT chelating groups was only possible in the presence of both PfeE and an iron reducer, such as DTT. The crystal structure of PfeE and an inactive PfeE mutant complexed with ferri-ENT or a non-hydrolysable ferri-catechol complex allowed identification of the enzyme binding site and the catalytic triad. Finally, cell fractionation and fluorescence microscopy showed periplasmic localization of PfeE in P. aeruginosa cells. Thus, the molecular mechanism of iron release from ENT in P. aeruginosa differs from that previously described in E. coli. In P. aeruginosa, siderophore hydrolysis occurs in the periplasm, with ENT never reaching the bacterial cytoplasm. In E. coli, ferri-ENT crosses the inner membrane via the ABC transporter FepBCD and ferri-ENT is hydrolyzed by the esterase Fes only once it is in the cytoplasm.

A key role for the periplasmic PfeE esterase in iron acquisition via the siderophore Enterobactin in Pseudomonas aeruginosa.,Perraud Q, Moynie L, Gasser V, Munier M, Godet J, Hoegy F, Mely Y, Mislin GLA, Naismith JH, Schalk IJ ACS Chem Biol. 2018 Aug 7. doi: 10.1021/acschembio.8b00543. PMID:30086222<ref>PMID:30086222</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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== References ==
<references/>
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</StructureSection>
[[Category: Moynie, L]]
[[Category: Naismith, J H]]
[[Category: Hydrolase]]
[[Category: Pa2689]]
[[Category: Pfee]]