Journal
CELL REPORTS
Volume 32, Issue 13, Pages -Publisher
CELL PRESS
DOI: 10.1016/j.celrep.2020.108208
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Funding
- Japan Agency for Medical Research and Development (AMED) [JP19am0101074, 17H03653]
- Takeda Science Foundation
- Uehara Science Foundation
- Naito Foundation
- Core Research for Evolutional Science and Technology from Japan Science and Technology Agency (JST) [JPMJCR14M4]
- Japan New Energy and Industrial Technology Development Organization (NEDO)
- AMED
- Platform Project for Supporting Drug Discovery and Life Science Research (BINDS) from AMED [JP19am0101115j0003, 1925]
- Grants-in-Aid for Scientific Research [17H03653] Funding Source: KAKEN
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ATP11C, a plasma membrane phospholipid flippase, maintains the asymmetric distribution of phosphatidylserine accumulated in the inner leaflet. Caspase-dependent inactivation of ATP11C is essential for an apoptotic eat me'' signal, phosphatidylserine exposure, which prompts phagocytes to engulf cells. We show six cryo-EM structures of ATP11C at 3.0-4.0 angstrom resolution in five different states of the transport cycle. A structural comparison reveals phosphorylation-driven domain movements coupled with phospholipid binding. Three structures of phospholipid-bound states visualize phospholipid translocation accompanied by the rearrangement of transmembrane helices and an unwound portion at the occlusion site, and thus they detail the basis for head group recognition and the locality of the protein-bound acyl chains in transmembrane grooves. Invariant Lys880 and the surrounding hydrogen-bond network serve as a pivot point for helix bending and precise P domain inclination, which is crucial for dephosphorylation. The structures detail key features of phospholipid translocation by ATP11C, and a common basic mechanism for flippases is emerging.
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