3b5y

<StructureSection load='3b5y' size='340' side='right' caption='[[3b5y]], [[Resolution|resolution]] 4.50&Aring;' scene=''>

<table><tr><td colspan='2'>[[3b5y]] is a 4 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3B5Y OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3B5Y FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ANP:PHOSPHOAMINOPHOSPHONIC+ACID-ADENYLATE+ESTER'>ANP</scene></td></tr>

<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3b5w|3b5w]], [[3b5x|3b5x]], [[3b5z|3b5z]], [[3b60|3b60]]</td></tr>

<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3b5y FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3b5y OCA], [http://pdbe.org/3b5y PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3b5y RCSB], [http://www.ebi.ac.uk/pdbsum/3b5y PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3b5y ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/MSBA_SALTY MSBA_SALTY]] Involved in lipid A export and possibly also in glycerophospholipid export and for biogenesis of the outer membrane. Transmembrane domains (TMD) form a pore in the inner membrane and the ATP-binding domain (NBD) is responsible for energy generation (By similarity).

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== Publication Abstract from PubMed ==

ATP-binding cassette (ABC) transporters are integral membrane proteins that translocate a wide variety of substrates across cellular membranes and are conserved from bacteria to humans. Here we compare four x-ray structures of the bacterial ABC lipid flippase, MsbA, trapped in different conformations, two nucleotide-bound structures and two in the absence of nucleotide. Comparison of the nucleotide-free conformations of MsbA reveals a flexible hinge formed by extracellular loops 2 and 3. This hinge allows the nucleotide-binding domains to disassociate while the ATP-binding half sites remain facing each other. The binding of the nucleotide causes a packing rearrangement of the transmembrane helices and changes the accessibility of the transporter from cytoplasmic (inward) facing to extracellular (outward) facing. The inward and outward openings are mediated by two different sets of transmembrane helix interactions. Altogether, the conformational changes between these structures suggest that large ranges of motion may be required for substrate transport.

Flexibility in the ABC transporter MsbA: Alternating access with a twist.,Ward A, Reyes CL, Yu J, Roth CB, Chang G Proc Natl Acad Sci U S A. 2007 Nov 27;104(48):19005-10. Epub 2007 Nov 16. PMID:18024585<ref>PMID:18024585</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 3b5y" style="background-color:#fffaf0;"></div>

== References ==

<references/>

[[Category: Chang, G]]

[[Category: Reyes, C L]]

[[Category: Roth, C B]]

[[Category: Ward, A]]

[[Category: Yu, J]]

[[Category: Abc transporter]]

[[Category: Atp-binding]]

[[Category: Transmembrane]]