View source for 6ajg


==Crystal structure of mycolic acid transporter MmpL3 from Mycobacterium smegmatis complexed with SQ109==
<StructureSection load='6ajg' size='340' side='right'caption='[[6ajg]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6ajg]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_virus_T4 Escherichia virus T4] and [https://en.wikipedia.org/wiki/Mycolicibacterium_smegmatis_MC2_155 Mycolicibacterium smegmatis MC2 155]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6AJG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6AJG 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]] 2.604&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=3RX:N-[(2E)-3,7-DIMETHYLOCTA-2,6-DIEN-1-YL]-N-[(1R,3S,5R,7R)-TRICYCLO[3.3.1.1~3,7~]DEC-2-YL]ETHANE-1,2-DIAMINE'>3RX</scene>, <scene name='pdbligand=LMT:DODECYL-BETA-D-MALTOSIDE'>LMT</scene>, <scene name='pdbligand=MHA:(CARBAMOYLMETHYL-CARBOXYMETHYL-AMINO)-ACETIC+ACID'>MHA</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=6ajg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6ajg OCA], [https://pdbe.org/6ajg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6ajg RCSB], [https://www.ebi.ac.uk/pdbsum/6ajg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6ajg ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/D9IEF7_BPT4 D9IEF7_BPT4] [https://www.uniprot.org/uniprot/MMPL3_MYCS2 MMPL3_MYCS2] Transports trehalose monomycolate (TMM) to the cell wall (PubMed:31239378, PubMed:22520756, PubMed:28698380). Flips TMM across the inner membrane. Membrane potential is not required for this function (PubMed:28698380). Transports probably phosphatidylethanolamine (PE) as well. Binds specifically both TMM and PE, but not trehalose dimycolate (TDM). Binds also diacylglycerol (DAG) and other phospholipids, including phosphatidylglycerol (PG), phosphatidylinositol (PI), and cardiolipin (CDL) (PubMed:31113875). Contributes to membrane potential, cell wall composition, antibiotic susceptibility and fitness (PubMed:28703701).<ref>PMID:22520756</ref> <ref>PMID:28698380</ref> <ref>PMID:28703701</ref> <ref>PMID:31113875</ref> <ref>PMID:31239378</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Despite intensive efforts to discover highly effective treatments to eradicate tuberculosis (TB), it remains as a major threat to global human health. For this reason, new TB drugs directed toward new targets are highly coveted. MmpLs (Mycobacterial membrane proteins Large), which play crucial roles in transporting lipids, polymers and immunomodulators and which also extrude therapeutic drugs, are among the most important therapeutic drug targets to emerge in recent times. Here, crystal structures of mycobacterial MmpL3 alone and in complex with four TB drug candidates, including SQ109 (in Phase 2b-3 clinical trials), are reported. MmpL3 consists of a periplasmic pore domain and a twelve-helix transmembrane domain. Two Asp-Tyr pairs centrally located in this domain appear to be key facilitators of proton-translocation. SQ109, AU1235, ICA38, and rimonabant bind inside the transmembrane region and disrupt these Asp-Tyr pairs. This structural data will greatly advance the development of MmpL3 inhibitors as new TB drugs.

Crystal Structures of Membrane Transporter MmpL3, an Anti-TB Drug Target.,Zhang B, Li J, Yang X, Wu L, Zhang J, Yang Y, Zhao Y, Zhang L, Yang X, Yang X, Cheng X, Liu Z, Jiang B, Jiang H, Guddat LW, Yang H, Rao Z Cell. 2019 Jan 24;176(3):636-648.e13. doi: 10.1016/j.cell.2019.01.003. PMID:30682372<ref>PMID:30682372</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6ajg" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia virus T4]]
[[Category: Large Structures]]
[[Category: Mycolicibacterium smegmatis MC2 155]]
[[Category: Li J]]
[[Category: Rao ZH]]
[[Category: Wu LJ]]
[[Category: Yang HT]]
[[Category: Yang XL]]
[[Category: Zhang B]]