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6sgr

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Cryo-EM structure of Escherichia coli AcrBZ and DARPin in Saposin A-nanodisc with cardiolipin

Structural highlights

6sgr is a 8 chain structure with sequence from Escherichia coli K-12 and Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	Electron Microscopy, Resolution 3.17Å
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

ACRB_ECOLI AcrAB is a drug efflux protein with a broad substrate specificity.^[1] ^[2] ^[3]

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^[4]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Murakami S, Nakashima R, Yamashita E, Matsumoto T, Yamaguchi A. Crystal structures of a multidrug transporter reveal a functionally rotating mechanism. Nature. 2006 Sep 14;443(7108):173-9. Epub 2006 Aug 16. PMID:16915237 doi:10.1038/nature05076
↑ Seeger MA, Schiefner A, Eicher T, Verrey F, Diederichs K, Pos KM. Structural asymmetry of AcrB trimer suggests a peristaltic pump mechanism. Science. 2006 Sep 1;313(5791):1295-8. PMID:16946072 doi:313/5791/1295
↑ Sennhauser G, Amstutz P, Briand C, Storchenegger O, Grutter MG. Drug export pathway of multidrug exporter AcrB revealed by DARPin inhibitors. PLoS Biol. 2007 Jan;5(1):e7. PMID:17194213 doi:10.1371/journal.pbio.0050007
↑ 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. Interactions of a Bacterial RND Transporter with a Transmembrane Small Protein in a Lipid Environment. Structure. 2020 Apr 16. pii: S0969-2126(20)30095-2. doi:, 10.1016/j.str.2020.03.013. PMID:32348749 doi:http://dx.doi.org/10.1016/j.str.2020.03.013

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/6sgr"

@@ Line 3: / Line 3: @@
 <StructureSection load='6sgr' size='340' side='right'caption='[[6sgr]], [[Resolution|resolution]] 3.17&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[6sgr]] is a 8 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6SGR OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6SGR FirstGlance]. <br>
+<table><tr><td colspan='2'>[[6sgr]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12] 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=6SGR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6SGR FirstGlance]. <br>
-</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=6sgr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6sgr OCA], [http://pdbe.org/6sgr PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6sgr RCSB], [http://www.ebi.ac.uk/pdbsum/6sgr PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6sgr ProSAT]</span></td></tr>
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.17&#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=6sgr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6sgr OCA], [https://pdbe.org/6sgr PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6sgr RCSB], [https://www.ebi.ac.uk/pdbsum/6sgr PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6sgr ProSAT]</span></td></tr>
 </table>
 == Function ==
-[[http://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>  [[http://www.uniprot.org/uniprot/ACRZ_ECOLI ACRZ_ECOLI]] AcrA-AcrB-AcrZ-TolC is a drug efflux protein complex with a broad substrate specificity. This protein binds to AcrB and is required for efflux of some but not all substrates, suggesting it may influence the specificity of drug export.<ref>PMID:23010927</ref>
+[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 ==
@@ Line 21: / Line 22: @@
 __TOC__
 </StructureSection>
+[[Category: Escherichia coli K-12]]
 [[Category: Large Structures]]
-[[Category: Du, D]]
+[[Category: Synthetic construct]]
-[[Category: Luisi, B F]]
+[[Category: Du D]]
-[[Category: Neuberger, A]]
+[[Category: Luisi BF]]
-[[Category: Newman, C]]
+[[Category: Neuberger A]]
-[[Category: Szewczak-Harris, A]]
+[[Category: Newman C]]
-[[Category: Antibiotic resistance]]
+[[Category: Szewczak-Harris A]]
-[[Category: Drug transport]]
-[[Category: Efflux pump]]
-[[Category: Lipid nanodisc]]
-[[Category: Membrane protein]]
-[[Category: Rnd transporter]]

6sgr

From Proteopedia

Current revision

Cryo-EM structure of Escherichia coli AcrBZ and DARPin in Saposin A-nanodisc with cardiolipin

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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