View source for 4ymw


==Crystal structure of an amino acid ABC transporter with histidines==
<StructureSection load='4ymw' size='340' side='right'caption='[[4ymw]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4ymw]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Caldanaerobacter_subterraneus_subsp._tengcongensis_MB4 Caldanaerobacter subterraneus subsp. tengcongensis MB4]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4YMW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4YMW 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]] 2.804&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HIS:HISTIDINE'>HIS</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=4ymw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ymw OCA], [https://pdbe.org/4ymw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ymw RCSB], [https://www.ebi.ac.uk/pdbsum/4ymw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ymw ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q8RCC2_CALS4 Q8RCC2_CALS4] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
ATP-binding cassette (ABC) transporters are ubiquitous integral membrane proteins that translocate a variety of substrates, ranging from ions to macromolecules, either out of or into the cytosol (hence defined as importers or exporters, respectively). It has been demonstrated that ABC exporters and importers function through a common mechanism involving conformational switches between inward-facing and outward-facing states; however, the mechanism underlying their functions, particularly substrate recognition, remains elusive. Here we report the structures of an amino acid ABC importer Art(QN)2 from Thermoanaerobacter tengcongensis composed of homodimers each of the transmembrane domain ArtQ and the nucleotide-binding domain ArtN, either in its apo form or in complex with substrates (Arg, His) and/or ATPs. The structures reveal that the straddling of the TMDs around the twofold axis forms a substrate translocation pathway across the membrane. Interestingly, each TMD has a negatively charged pocket that together create a negatively charged internal tunnel allowing amino acids carrying positively charged groups to pass through. Our structural and functional studies provide a better understanding of how ABC transporters select and translocate their substrates.

Structural basis for substrate specificity of an amino acid ABC transporter.,Yu J, Ge J, Heuveling J, Schneider E, Yang M Proc Natl Acad Sci U S A. 2015 Apr 6. pii: 201415037. PMID:25848002<ref>PMID:25848002</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4ymw" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Caldanaerobacter subterraneus subsp. tengcongensis MB4]]
[[Category: Large Structures]]
[[Category: Ge J]]
[[Category: Yang M]]
[[Category: Yu J]]