View source for 9k3x


==Cryo-EM structure of E coli pstSCAB in the pretranslocation state==
<StructureSection load='9k3x' size='340' side='right'caption='[[9k3x]], [[Resolution|resolution]] 2.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[9k3x]] is a 5 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=9K3X OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=9K3X FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 2.9&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</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=9k3x FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=9k3x OCA], [https://pdbe.org/9k3x PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=9k3x RCSB], [https://www.ebi.ac.uk/pdbsum/9k3x PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=9k3x ProSAT]</span></td></tr>
</table>
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== Publication Abstract from PubMed ==
Inorganic phosphate (Pi) is essential for all living organisms. PstSCAB, a bacterial high-affinity ABC transporter, imports Pi under limiting conditions via five subunits: PstA and PstC forming the transmembrane domain (TMD), periplasmic PstS that switches between free and TMD-docked forms for Pi capture and delivery, and two cytosolic PstB subunits for ATP binding and hydrolysis. Its malfunction affects the virulence of pathogenic bacteria, making it pharmaceutically attractive. However, complete structural pictures of PstSCAB in different states remain lacking. Here, we determine cryo-EM structures of PstSCAB in resting, pretranslocation, and catalytic intermediate states, which reveal that conformational changes in PstS and ATP binding/unbinding in PstB collectively induce rigid-body movements of TMD, generating inward- or outward-facing conformations. In TMD, Pi specificity is determined by positively charged Arg220 (PstA) and Arg237 (PstC). This study advances understanding of bacterial Pi import and supports drug development targeting PstSCAB.

Molecular mechanism of phosphate import by the bacterial PstSCAB transporter.,Xiao H, Li S, Qi R, Hu Y, Jiang X, Luo J, Wu J, Zhang L, Xu S, Lu D, Yang X, Chen Q, Liu S Nat Commun. 2026 Feb 3. doi: 10.1038/s41467-026-69153-1. PMID:41634007<ref>PMID:41634007</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 9k3x" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Escherichia coli K-12]]
[[Category: Large Structures]]
[[Category: Chen QF]]
[[Category: Xiao H]]