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| | <StructureSection load='6ujs' size='340' side='right'caption='[[6ujs]], [[Resolution|resolution]] 4.17Å' scene=''> | | <StructureSection load='6ujs' size='340' side='right'caption='[[6ujs]], [[Resolution|resolution]] 4.17Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[6ujs]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Lk3_transgenic_mice Lk3 transgenic mice]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6UJS OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6UJS FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[6ujs]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6UJS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6UJS FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=4C8:2,4-DIBROMOPHENYL+2,4,6-TRIBROMOPHENYL+ETHER'>4C8</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 4.17Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Abcb1a, Abcb4, Mdr1a, Mdr3, Pgy-3, Pgy3 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10090 LK3 transgenic mice])</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=4C8:2,4-DIBROMOPHENYL+2,4,6-TRIBROMOPHENYL+ETHER'>4C8</scene></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=6ujs FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6ujs OCA], [http://pdbe.org/6ujs PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6ujs RCSB], [http://www.ebi.ac.uk/pdbsum/6ujs PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6ujs ProSAT]</span></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=6ujs FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6ujs OCA], [https://pdbe.org/6ujs PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6ujs RCSB], [https://www.ebi.ac.uk/pdbsum/6ujs PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6ujs ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/MDR1A_MOUSE MDR1A_MOUSE]] Energy-dependent efflux pump responsible for decreased drug accumulation in multidrug-resistant cells.<ref>PMID:19325113</ref> | + | [https://www.uniprot.org/uniprot/MDR1A_MOUSE MDR1A_MOUSE] Energy-dependent efflux pump responsible for decreased drug accumulation in multidrug-resistant cells.<ref>PMID:19325113</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Lk3 transgenic mice]] | + | [[Category: Mus musculus]] |
| - | [[Category: Aller, S G]] | + | [[Category: Aller SG]] |
| - | [[Category: Le, C A]] | + | [[Category: Le CA]] |
| - | [[Category: Mdr1]]
| + | |
| - | [[Category: Multidrug resistance protein]]
| + | |
| - | [[Category: P-glycoprotein]]
| + | |
| - | [[Category: P-gp]]
| + | |
| - | [[Category: Pgp]]
| + | |
| - | [[Category: Translocase]]
| + | |
| Structural highlights
Function
MDR1A_MOUSE Energy-dependent efflux pump responsible for decreased drug accumulation in multidrug-resistant cells.[1]
Publication Abstract from PubMed
The multidrug transporter P-glycoprotein (Pgp)/ABCB1/MDR1 plays an important role in multidrug resistance (MDR) and detoxification owing to its ability to efflux an unusually large and chemically diverse set of substrates. Previous phenylalanine-to-alanine scanning mutagenesis of Pgp revealed that nearly all mutations retained full MDR function and still permitted substrate transport. This suggests that either the loss of any single aromatic side chain did not affect the ligand-binding modes or that highly adaptive and compensatory drug recognition is an intrinsic property including ligand-binding shifts that preserve function. To explore this hypothesis, the ATPase function and crystallographic localization of five single-site mutations in which the native aromatic residue directly interacted with the environmental pollutant BDE-100, as shown in previous crystal structures, were tested. Two mutants, Y303A and Y306A, showed strong BDE-100 occupancy at the original site (site 1), but also revealed a novel site 2 located on the opposing pseudo-symmetric half of the drug-binding pocket (DBP). Surprisingly, the F724A mutant structure had no detectable binding in site 1 but exhibited a novel site shifted 11 A from site 1. ATPase studies revealed shifts in ATPase kinetics for the five mutants, but otherwise indicated a catalytically active transporter that was inhibited by BDE-100, similar to wild-type Pgp. These results emphasize a high degree of compensatory drug recognition in Pgp that is made possible by aromatic amino-acid side chains concentrated in the DBP. Compensatory recognition forms the underpinning of polyspecific drug transport, but also highlights the challenges associated with the design of therapeutics that evade efflux altogether.
Structural definition of polyspecific compensatory ligand recognition by P-glycoprotein.,Le CA, Harvey DS, Aller SG IUCrJ. 2020 Jun 6;7(Pt 4):663-672. doi: 10.1107/S2052252520005709. eCollection, 2020 Jul 1. PMID:32695413[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Aller SG, Yu J, Ward A, Weng Y, Chittaboina S, Zhuo R, Harrell PM, Trinh YT, Zhang Q, Urbatsch IL, Chang G. Structure of P-glycoprotein reveals a molecular basis for poly-specific drug binding. Science. 2009 Mar 27;323(5922):1718-22. PMID:19325113 doi:323/5922/1718
- ↑ Le CA, Harvey DS, Aller SG. Structural definition of polyspecific compensatory ligand recognition by P-glycoprotein. IUCrJ. 2020 Jun 6;7(Pt 4):663-672. doi: 10.1107/S2052252520005709. eCollection, 2020 Jul 1. PMID:32695413 doi:http://dx.doi.org/10.1107/S2052252520005709
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