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[[Image:2gif.gif|left|200px]]


{{Structure
==Asymmetric structure of trimeric AcrB from Escherichia coli==
|PDB= 2gif |SIZE=350|CAPTION= <scene name='initialview01'>2gif</scene>, resolution 2.90&Aring;
<StructureSection load='2gif' size='340' side='right'caption='[[2gif]], [[Resolution|resolution]] 2.90&Aring;' scene=''>
|SITE=  
== Structural highlights ==
|LIGAND= <scene name='pdbligand=FLC:CITRATE+ANION'>FLC</scene>
<table><tr><td colspan='2'>[[2gif]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2GIF OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2GIF FirstGlance]. <br>
|ACTIVITY=
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.9&#8491;</td></tr>
|GENE= acrB, acrE ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FLC:CITRATE+ANION'>FLC</scene></td></tr>
|DOMAIN=
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2gif FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2gif OCA], [https://pdbe.org/2gif PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2gif RCSB], [https://www.ebi.ac.uk/pdbsum/2gif PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2gif ProSAT]</span></td></tr>
|RELATEDENTRY=[[1iwg|1IWG]]
</table>
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2gif FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2gif OCA], [http://www.ebi.ac.uk/pdbsum/2gif PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2gif RCSB]</span>
== 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>
 
== Evolutionary Conservation ==
'''Asymmetric structure of trimeric AcrB from Escherichia coli'''
[[Image:Consurf_key_small.gif|200px|right]]
 
Check<jmol>
 
  <jmolCheckbox>
==Overview==
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/gi/2gif_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2gif ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The AcrA/AcrB/TolC complex spans the inner and outer membranes of Escherichia coli and serves as its major drug-resistance pump. Driven by the proton motive force, it mediates the efflux of bile salts, detergents, organic solvents, and many structurally unrelated antibiotics. Here, we report a crystallographic structure of trimeric AcrB determined at 2.9 and 3.0 angstrom resolution in space groups that allow asymmetry of the monomers. This structure reveals three different monomer conformations representing consecutive states in a transport cycle. The structural data imply an alternating access mechanism and a novel peristaltic mode of drug transport by this type of transporter.
The AcrA/AcrB/TolC complex spans the inner and outer membranes of Escherichia coli and serves as its major drug-resistance pump. Driven by the proton motive force, it mediates the efflux of bile salts, detergents, organic solvents, and many structurally unrelated antibiotics. Here, we report a crystallographic structure of trimeric AcrB determined at 2.9 and 3.0 angstrom resolution in space groups that allow asymmetry of the monomers. This structure reveals three different monomer conformations representing consecutive states in a transport cycle. The structural data imply an alternating access mechanism and a novel peristaltic mode of drug transport by this type of transporter.


==About this Structure==
Structural asymmetry of AcrB trimer suggests a peristaltic pump mechanism.,Seeger MA, Schiefner A, Eicher T, Verrey F, Diederichs K, Pos KM Science. 2006 Sep 1;313(5791):1295-8. PMID:16946072<ref>PMID:16946072</ref>
2GIF is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2GIF OCA].


==Reference==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
Structural asymmetry of AcrB trimer suggests a peristaltic pump mechanism., Seeger MA, Schiefner A, Eicher T, Verrey F, Diederichs K, Pos KM, Science. 2006 Sep 1;313(5791):1295-8. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16946072 16946072]
</div>
<div class="pdbe-citations 2gif" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Diederichs, K.]]
[[Category: Diederichs K]]
[[Category: Eicher, T.]]
[[Category: Eicher T]]
[[Category: Pos, K M.]]
[[Category: Pos KM]]
[[Category: Schiefner, A.]]
[[Category: Schiefner A]]
[[Category: Seeger, M A.]]
[[Category: Seeger MA]]
[[Category: Verrey, F.]]
[[Category: Verrey F]]
[[Category: alternating site mechanism]]
[[Category: antibiotic resistance]]
[[Category: drug-efflux pump]]
[[Category: membrane protein]]
[[Category: rnd]]
[[Category: secondary transport]]
 
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