View source for 6sgs


==Cryo-EM structure of Escherichia coli AcrBZ and DARPin in Saposin A-nanodisc==
<StructureSection load='6sgs' size='340' side='right'caption='[[6sgs]], [[Resolution|resolution]] 3.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6sgs]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12], [https://en.wikipedia.org/wiki/Shigella_boydii_965-58 Shigella boydii 965-58] and [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6SGS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6SGS 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]] 3.2&#8491;</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=6sgs FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6sgs OCA], [https://pdbe.org/6sgs PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6sgs RCSB], [https://www.ebi.ac.uk/pdbsum/6sgs PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6sgs ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ACRB_ECOLI ACRB_ECOLI] AcrAB is a drug efflux protein with a broad substrate specificity.<ref>PMID:16915237</ref> <ref>PMID:16946072</ref> <ref>PMID:17194213</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The small protein AcrZ in Escherichia coli interacts with the transmembrane portion of the multidrug efflux pump AcrB and increases resistance of the bacterium to a subset of the antibiotic substrates of that transporter. It is not clear how the physical association of the two proteins selectively changes activity of the pump for defined substrates. Here, we report cryo-EM structures of AcrB and the AcrBZ complex in lipid environments, and comparisons suggest that conformational changes occur in the drug-binding pocket as a result of AcrZ binding. Simulations indicate that cardiolipin preferentially interacts with the AcrBZ complex, due to increased contact surface, and we observe that chloramphenicol sensitivity of bacteria lacking AcrZ is exacerbated when combined with cardiolipin deficiency. Taken together, the data suggest that AcrZ and lipid cooperate to allosterically modulate AcrB activity. This mode of regulation by a small protein and lipid may occur for other membrane proteins.

Interactions of a Bacterial RND Transporter with a Transmembrane Small Protein in a Lipid Environment.,Du D, Neuberger A, Orr MW, Newman CE, Hsu PC, Samsudin F, Szewczak-Harris A, Ramos LM, Debela M, Khalid S, Storz G, Luisi BF Structure. 2020 Apr 16. pii: S0969-2126(20)30095-2. doi:, 10.1016/j.str.2020.03.013. PMID:32348749<ref>PMID:32348749</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6sgs" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli K-12]]
[[Category: Large Structures]]
[[Category: Shigella boydii 965-58]]
[[Category: Synthetic construct]]
[[Category: Du D]]
[[Category: Luisi BF]]
[[Category: Neuberger A]]
[[Category: Newman C]]
[[Category: Szewczak-Harris A]]