Cryo-EM structure of wild-type bovine multidrug resistance protein 1 (MRP1) under active turnover conditions
マップデータ
3.23-Angstrom cryo-EM reconstruction of wild-type bovine MRP1 under active turnover conditions in the presence of ATP and leukotriene C4
試料
複合体: bovine multidrug resistance protein 1 (MRP1)
タンパク質・ペプチド: Multidrug resistance-associated protein 1
リガンド: ADENOSINE-5'-TRIPHOSPHATE
リガンド: ADENOSINE-5'-DIPHOSPHATE
リガンド: MAGNESIUM ION
リガンド: CHOLESTEROL
キーワード
ABC transporter / multidrug resistance / outward facing / TRANSPORT PROTEIN / MRP1
機能・相同性
機能・相同性情報
Sphingolipid de novo biosynthesis / Heme degradation / Synthesis of Leukotrienes (LT) and Eoxins (EX) / Transport of RCbl within the body / cyclic nucleotide transport / Paracetamol ADME / ABC-family proteins mediated transport / leukotriene transport / glutathione transmembrane transport / ABC-type glutathione-S-conjugate transporter ...Sphingolipid de novo biosynthesis / Heme degradation / Synthesis of Leukotrienes (LT) and Eoxins (EX) / Transport of RCbl within the body / cyclic nucleotide transport / Paracetamol ADME / ABC-family proteins mediated transport / leukotriene transport / glutathione transmembrane transport / ABC-type glutathione-S-conjugate transporter / ABC-type glutathione S-conjugate transporter activity / Cytoprotection by HMOX1 / glutathione transmembrane transporter activity / ABC-type xenobiotic transporter / ABC-type xenobiotic transporter activity / xenobiotic transport / lipid transport / xenobiotic transmembrane transporter activity / ABC-type transporter activity / positive regulation of inflammatory response / basolateral plasma membrane / response to xenobiotic stimulus / ATP hydrolysis activity / ATP binding 類似検索 - 分子機能
Multi drug resistance-associated protein / : / ABC transporter TMD0 domain / : / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / ABC transporter-like, conserved site / ABC transporters family signature. ...Multi drug resistance-associated protein / : / ABC transporter TMD0 domain / : / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter / ABC transporter-like, ATP-binding domain / ATP-binding cassette, ABC transporter-type domain profile. / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase 類似検索 - ドメイン・相同性
Multidrug resistance-associated protein 1 類似検索 - 構成要素
ジャーナル: Elife / 年: 2020 タイトル: Characterization of the kinetic cycle of an ABC transporter by single-molecule and cryo-EM analyses. 著者: Ling Wang / Zachary Lee Johnson / Michael R Wasserman / Jesper Levring / Jue Chen / Shixin Liu / 要旨: ATP-binding cassette (ABC) transporters are molecular pumps ubiquitous across all kingdoms of life. While their structures have been widely reported, the kinetics governing their transport cycles ...ATP-binding cassette (ABC) transporters are molecular pumps ubiquitous across all kingdoms of life. While their structures have been widely reported, the kinetics governing their transport cycles remain largely unexplored. Multidrug resistance protein 1 (MRP1) is an ABC exporter that extrudes a variety of chemotherapeutic agents and native substrates. Previously, the structures of MRP1 were determined in an inward-facing (IF) or outward-facing (OF) conformation. Here, we used single-molecule fluorescence spectroscopy to track the conformational changes of bovine MRP1 (bMRP1) in real time. We also determined the structure of bMRP1 under active turnover conditions. Our results show that substrate stimulates ATP hydrolysis by accelerating the IF-to-OF transition. The rate-limiting step of the transport cycle is the dissociation of the nucleotide-binding-domain dimer, while ATP hydrolysis per se does not reset MRP1 to the resting state. The combination of structural and kinetic data illustrates how different conformations of MRP1 are temporally linked and how substrate and ATP alter protein dynamics to achieve active transport.