7KY8 image
Deposition Date 2020-12-07
Release Date 2021-01-06
Last Version Date 2025-05-21
Entry Detail
PDB ID:
7KY8
Keywords:
Title:
Structure of the S. cerevisiae phosphatidylcholine flippase Dnf2-Lem3 complex in the E1-ATP state
Biological Source:
Method Details:
Experimental Method:
Resolution:
3.85 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Phospholipid-transporting ATPase DNF2
Gene (Uniprot):DNF2
Chain IDs:A
Chain Length:1612
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
Polymer Type:polypeptide(L)
Molecule:Alkylphosphocholine resistance protein LEM3
Gene (Uniprot):LEM3
Chain IDs:B
Chain Length:414
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
Primary Citation
Transport mechanism of P4 ATPase phosphatidylcholine flippases.
Elife 9 ? ? (2020)
PMID: 33320091 DOI: 10.7554/eLife.62163

Abstact

The P4 ATPases use ATP hydrolysis to transport large lipid substrates across lipid bilayers. The structures of the endosome- and Golgi-localized phosphatidylserine flippases-such as the yeast Drs2 and human ATP8A1-have recently been reported. However, a substrate-binding site on the cytosolic side has not been found, and the transport mechanisms of P4 ATPases with other substrates are unknown. Here, we report structures of the S. cerevisiae Dnf1-Lem3 and Dnf2-Lem3 complexes. We captured substrate phosphatidylcholine molecules on both the exoplasmic and cytosolic sides and found that they have similar structures. Unexpectedly, Lem3 contributes to substrate binding. The conformational transitions of these phosphatidylcholine transporters match those of the phosphatidylserine transporters, suggesting a conserved mechanism among P4 ATPases. Dnf1/Dnf2 have a unique P domain helix-turn-helix insertion that is important for function. Therefore, P4 ATPases may have retained an overall transport mechanism while evolving distinct features for different lipid substrates.

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Primary Citation of related structures