National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
1R01GM146906
米国
引用
ジャーナル: EMBO J / 年: 2025 タイトル: Structural insights into binding-site access and ligand recognition by human ABCB1. 著者: Devanshu Kurre / Phuoc X Dang / Le T M Le / Varun V Gadkari / Amer Alam / 要旨: ABCB1 is a broad-spectrum efflux pump central to cellular drug handling and multidrug resistance in humans. However, how it is able to recognize and transport a wide range of diverse substrates ...ABCB1 is a broad-spectrum efflux pump central to cellular drug handling and multidrug resistance in humans. However, how it is able to recognize and transport a wide range of diverse substrates remains poorly understood. Here we present cryo-EM structures of lipid-embedded human ABCB1 in conformationally distinct apo-, substrate-bound, inhibitor-bound, and nucleotide-trapped states at 3.4-3.9 Å resolution, in the absence of stabilizing antibodies or mutations. The substrate-binding site is located within one half of the molecule and, in the apo state, is obstructed by the transmembrane helix (TM) 4. Substrate and inhibitor binding are distinguished by major TM rearrangements and their ligand binding chemistry, with TM4 playing a central role in all conformational transitions. Furthermore, our data identify secondary structure-breaking residues that impart localized TM flexibility and asymmetry between the two transmembrane domains. The resulting structural changes and lipid interactions that are induced by substrate and inhibitor binding can predict substrate-binding profiles and may direct ABCB1 inhibitor design.
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包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: Human ABCB1 reconstituted in Saposin A nanoparticles (SapNPs) comprising Brain Polar Lipids and Cholesterol