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==Cryo-EM structure of Plasmodium falciparum multidrug resistance protein 1 in the apo state with H1 helix== | |||
<StructureSection load='8jvh' size='340' side='right'caption='[[8jvh]], [[Resolution|resolution]] 3.19Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[8jvh]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Plasmodium_falciparum_3D7 Plasmodium falciparum 3D7]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8JVH OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8JVH FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.19Å</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=8jvh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8jvh OCA], [https://pdbe.org/8jvh PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8jvh RCSB], [https://www.ebi.ac.uk/pdbsum/8jvh PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8jvh ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/Q7K6A5_PLAF7 Q7K6A5_PLAF7] | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Plasmodium falciparum multidrug resistance protein 1 (PfMDR1), an adenosine triphosphate (ATP)-binding cassette (ABC) transporter on the digestive vacuole (DV) membrane of the parasite, is associated with the resistance to antimalarial drugs. To understand the mechanisms of PfMDR1, we determined the cryo-electron microscopy structures of this transporter in different states. The transporter in the apo state shows an inward-facing conformation with a large cavity opening to the cytoplasm. Upon ATP binding and dimerization of the nucleotide-binding domains (NBDs), PfMDR1 displays an outward-facing conformation with a cavity toward the DV lumen. Drug resistance-associated mutations were investigated in both structures for their effects, and Y184F was identified as an allosteric activity-enhancing mutation. The amphiphilic substrate-binding site of PfMDR1 was revealed by the complex structure with the antimalarial drug mefloquine and confirmed by mutagenesis studies. Remarkably, a helical structure was found to hinder NBD dimerization and inhibit PfMDR1 activity. The location of this regulatory domain in the N terminus is different from the well-studied R domain in the internal linker region of other ABC transporter family members. The lack of the phosphorylation site of this domain also suggests a different regulation mechanism. | |||
The structure of Plasmodium falciparum multidrug resistance protein 1 reveals an N-terminal regulatory domain.,Si K, He X, Chen L, Zhang A, Guo C, Li M Proc Natl Acad Sci U S A. 2023 Aug 8;120(32):e2219905120. doi: , 10.1073/pnas.2219905120. Epub 2023 Aug 1. PMID:37527341<ref>PMID:37527341</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
[[Category: Li | <div class="pdbe-citations 8jvh" style="background-color:#fffaf0;"></div> | ||
[[Category: Si | == References == | ||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Plasmodium falciparum 3D7]] | |||
[[Category: Li M]] | |||
[[Category: Si K]] | |||
Latest revision as of 12:14, 30 August 2023
Cryo-EM structure of Plasmodium falciparum multidrug resistance protein 1 in the apo state with H1 helixCryo-EM structure of Plasmodium falciparum multidrug resistance protein 1 in the apo state with H1 helix
Structural highlights
FunctionPublication Abstract from PubMedPlasmodium falciparum multidrug resistance protein 1 (PfMDR1), an adenosine triphosphate (ATP)-binding cassette (ABC) transporter on the digestive vacuole (DV) membrane of the parasite, is associated with the resistance to antimalarial drugs. To understand the mechanisms of PfMDR1, we determined the cryo-electron microscopy structures of this transporter in different states. The transporter in the apo state shows an inward-facing conformation with a large cavity opening to the cytoplasm. Upon ATP binding and dimerization of the nucleotide-binding domains (NBDs), PfMDR1 displays an outward-facing conformation with a cavity toward the DV lumen. Drug resistance-associated mutations were investigated in both structures for their effects, and Y184F was identified as an allosteric activity-enhancing mutation. The amphiphilic substrate-binding site of PfMDR1 was revealed by the complex structure with the antimalarial drug mefloquine and confirmed by mutagenesis studies. Remarkably, a helical structure was found to hinder NBD dimerization and inhibit PfMDR1 activity. The location of this regulatory domain in the N terminus is different from the well-studied R domain in the internal linker region of other ABC transporter family members. The lack of the phosphorylation site of this domain also suggests a different regulation mechanism. The structure of Plasmodium falciparum multidrug resistance protein 1 reveals an N-terminal regulatory domain.,Si K, He X, Chen L, Zhang A, Guo C, Li M Proc Natl Acad Sci U S A. 2023 Aug 8;120(32):e2219905120. doi: , 10.1073/pnas.2219905120. Epub 2023 Aug 1. PMID:37527341[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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