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==BmrCD_IF-H/ATP==
==Heterodimeric ABC transporter BmrCD in the inward-facing conformation bound to substrate and ATP: BmrCD_IF-1HT/ATP==
<StructureSection load='8szc' size='340' side='right'caption='[[8szc]], [[Resolution|resolution]] 3.06&Aring;' scene=''>
<StructureSection load='8szc' size='340' side='right'caption='[[8szc]], [[Resolution|resolution]] 3.06&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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== Function ==
== Function ==
[https://www.uniprot.org/uniprot/YHEH_BACSU YHEH_BACSU] Involved in the transport of four structurally unrelated drugs, including doxorubicin and mitoxantrone. Transmembrane domains (TMD) form a pore in the membrane and the ATP-binding domain (NBD) is responsible for energy generation.<ref>PMID:19167342</ref>  
[https://www.uniprot.org/uniprot/YHEH_BACSU YHEH_BACSU] Involved in the transport of four structurally unrelated drugs, including doxorubicin and mitoxantrone. Transmembrane domains (TMD) form a pore in the membrane and the ATP-binding domain (NBD) is responsible for energy generation.<ref>PMID:19167342</ref>  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Here we used cryo-electron microscopy (cryo-EM), double electron-electron resonance spectroscopy (DEER), and molecular dynamics (MD) simulations, to capture and characterize ATP- and substrate-bound inward-facing (IF) and occluded (OC) conformational states of the heterodimeric ATP binding cassette (ABC) multidrug exporter BmrCD in lipid nanodiscs. Supported by DEER analysis, the structures reveal that ATP-powered isomerization entails changes in the relative symmetry of the BmrC and BmrD subunits that propagates from the transmembrane domain to the nucleotide binding domain. The structures uncover asymmetric substrate and Mg(2+) binding which we hypothesize are required for triggering ATP hydrolysis preferentially in one of the nucleotide-binding sites. MD simulations demonstrate that multiple lipid molecules differentially bind the IF versus the OC conformation thus establishing that lipid interactions modulate BmrCD energy landscape. Our findings are framed in a model that highlights the role of asymmetric conformations in the ATP-coupled transport with general implications to the mechanism of ABC transporters.
Asymmetric conformations and lipid interactions shape the ATP-coupled cycle of a heterodimeric ABC transporter.,Tang Q, Sinclair M, Hasdemir HS, Stein RA, Karakas E, Tajkhorshid E, Mchaourab HS Nat Commun. 2023 Nov 8;14(1):7184. doi: 10.1038/s41467-023-42937-5. PMID:37938578<ref>PMID:37938578</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8szc" style="background-color:#fffaf0;"></div>
== References ==
== References ==
<references/>
<references/>

Latest revision as of 09:09, 4 June 2025

Heterodimeric ABC transporter BmrCD in the inward-facing conformation bound to substrate and ATP: BmrCD_IF-1HT/ATP

8szc, resolution 3.06Å

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