View source for 8gxf


==Pseudomonas flexibilis GCN5 family acetyltransferase==
<StructureSection load='8gxf' size='340' side='right'caption='[[8gxf]], [[Resolution|resolution]] 3.04&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8gxf]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Pseudomonas_flexibilis Pseudomonas flexibilis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8GXF OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8GXF 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]] 3.04&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=COA:COENZYME+A'>COA</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=8gxf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8gxf OCA], [https://pdbe.org/8gxf PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8gxf RCSB], [https://www.ebi.ac.uk/pdbsum/8gxf PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8gxf ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A0A0B3C4T8_9PSED A0A0B3C4T8_9PSED] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Type II toxin-antitoxin (TA) systems are widely distributed in bacterial and archaeal genomes and are involved in diverse critical cellular functions such as defense against phages, biofilm formation, persistence, and virulence. GCN5-related N-acetyltransferase (GNAT) toxin, with an acetyltransferase activity-dependent mechanism of translation inhibition, represents a relatively new and expanding family of type II TA toxins. We here describe a group of GNAT-Xre TA modules widely distributed among Pseudomonas species. We investigated PacTA (one of its members encoded by PA3270/PA3269) from Pseudomonas aeruginosa and demonstrated that the PacT toxin positively regulates iron acquisition in P. aeruginosa. Notably, other than arresting translation through acetylating aminoacyl-tRNAs, PacT can directly bind to Fur, a key ferric uptake regulator, to attenuate its DNA-binding affinity and thus permit the expression of downstream iron-acquisition-related genes. We further showed that the expression of the pacTA locus is upregulated in response to iron starvation and the absence of PacT causes biofilm formation defect, thereby attenuating pathogenesis. Overall, these findings reveal a novel regulatory mechanism of GNAT toxin that controls iron-uptake-related genes and contributes to bacterial virulence.

The novel type II toxin-antitoxin PacTA modulates Pseudomonas aeruginosa iron homeostasis by obstructing the DNA-binding activity of Fur.,Song Y, Zhang S, Ye Z, Song Y, Chen L, Tong A, He Y, Bao R Nucleic Acids Res. 2022 Oct 14;50(18):10586-10600. doi: 10.1093/nar/gkac867. PMID:36200834<ref>PMID:36200834</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8gxf" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Pseudomonas flexibilis]]
[[Category: Bao R]]
[[Category: Song YJ]]