+検索条件
-Structure paper
タイトル | Cholesterol efflux mechanism revealed by structural analysis of human ABCA1 conformational states. |
---|---|
ジャーナル・号・ページ | Nat Cardiovasc Res, Vol. 1, Issue 3, Page 238-245, Year 2022 |
掲載日 | 2022年3月3日 |
著者 | Yingyuan Sun / Xiaochun Li / |
PubMed 要旨 | ATP-binding cassette transporter A1 (ABCA1) utilizes energy derived from ATP hydrolysis to export cholesterol and phospholipids from macrophages. ABCA1 plays a central role in the biosynthesis of ...ATP-binding cassette transporter A1 (ABCA1) utilizes energy derived from ATP hydrolysis to export cholesterol and phospholipids from macrophages. ABCA1 plays a central role in the biosynthesis of high-density lipoprotein (HDL), which mediates reverse cholesterol transport and prevents detrimental lipid deposition. Mutations in ABCA1 cause Tangier disease characterized by a remarkable reduction in the amount of HDL in blood. Here we present cryo-electron microscopy structures of human ABCA1 in ATP-bound and nucleotide-free states. Structural comparison reveals that ATP molecules pull the nucleotide-binding domains together, inducing movements of transmembrane helices 1, 2, 7 and 8 through a series of salt-bridge interactions. Subsequently, extracellular domains (ECDs) undergo a rotation and introduce conformational changes in the ECD-transmembrane interface. In addition, while we observe a sterol-like molecule in ECDs, no such density was observed in the structure of an HDL-deficiency mutant ABCA1, demonstrating the physiological importance of ECDs and a putative interaction mode between ABCA1 and its lipid acceptors. Thus, these structures, along with cholesterol efflux assays, advance the understanding ABCA1-mediated reverse cholesterol transport. |
リンク | Nat Cardiovasc Res / PubMed:37181814 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.1 - 4.3 Å |
構造データ | EMDB-25800, PDB-7tbw: EMDB-25801, PDB-7tby: EMDB-25802, PDB-7tbz: EMDB-25803, PDB-7tc0: |
化合物 | ChemComp-CLR: ChemComp-ATP: ChemComp-MG: ChemComp-NAG: |
由来 |
|
キーワード | TRANSPORT PROTEIN / HDL / cholesterol / Tangier Disease / ABC transporter |