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- EMDB-65258: Cryo-EM structure of a human flippase mutant ATP11C Q79A-CDC50A i... -

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Basic information

Entry
Database: EMDB / ID: EMD-65258
TitleCryo-EM structure of a human flippase mutant ATP11C Q79A-CDC50A in the PtdSer-occluded E2-AlF state
Map data
Sample
  • Complex: ATP11C Q79A-CDC50A lipid flippase complex
    • Protein or peptide: Phospholipid-transporting ATPase IG
    • Protein or peptide: Cell cycle control protein 50A
  • Ligand: TETRAFLUOROALUMINATE ION
  • Ligand: MAGNESIUM ION
  • Ligand: O-[(R)-{[(2R)-2,3-bis(octadecanoyloxy)propyl]oxy}(hydroxy)phosphoryl]-L-serine
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: water
KeywordsLipid transporter flippase / PC bound E2P state / TRANSPORT PROTEIN
Function / homology
Function and homology information


positive regulation of phospholipid translocation / aminophospholipid flippase activity / aminophospholipid transport / phosphatidylserine flippase activity / protein localization to endosome / phospholipid-translocating ATPase complex / positive regulation of protein exit from endoplasmic reticulum / phosphatidylserine floppase activity / ATPase-coupled intramembrane lipid transporter activity / phosphatidylethanolamine flippase activity ...positive regulation of phospholipid translocation / aminophospholipid flippase activity / aminophospholipid transport / phosphatidylserine flippase activity / protein localization to endosome / phospholipid-translocating ATPase complex / positive regulation of protein exit from endoplasmic reticulum / phosphatidylserine floppase activity / ATPase-coupled intramembrane lipid transporter activity / phosphatidylethanolamine flippase activity / xenobiotic transmembrane transport / P-type phospholipid transporter / phospholipid translocation / azurophil granule membrane / transport vesicle membrane / Ion transport by P-type ATPases / specific granule membrane / positive regulation of neuron projection development / recycling endosome / recycling endosome membrane / late endosome membrane / early endosome membrane / monoatomic ion transmembrane transport / apical plasma membrane / lysosomal membrane / Neutrophil degranulation / endoplasmic reticulum membrane / structural molecule activity / magnesium ion binding / endoplasmic reticulum / Golgi apparatus / ATP hydrolysis activity / ATP binding / membrane / plasma membrane
Similarity search - Function
CDC50/LEM3 family / LEM3 (ligand-effect modulator 3) family / CDC50 family / P-type ATPase, subfamily IV / P-type ATPase, C-terminal / P-type ATPase, N-terminal / Phospholipid-translocating ATPase N-terminal / Phospholipid-translocating P-type ATPase C-terminal / P-type ATPase, cytoplasmic domain N / P-type ATPase actuator domain / P-type ATPase, haloacid dehalogenase domain ...CDC50/LEM3 family / LEM3 (ligand-effect modulator 3) family / CDC50 family / P-type ATPase, subfamily IV / P-type ATPase, C-terminal / P-type ATPase, N-terminal / Phospholipid-translocating ATPase N-terminal / Phospholipid-translocating P-type ATPase C-terminal / P-type ATPase, cytoplasmic domain N / P-type ATPase actuator domain / P-type ATPase, haloacid dehalogenase domain / P-type ATPase, phosphorylation site / P-type ATPase, cytoplasmic domain N / E1-E2 ATPases phosphorylation site. / P-type ATPase, A domain superfamily / P-type ATPase / P-type ATPase, transmembrane domain superfamily / HAD superfamily / HAD-like superfamily
Similarity search - Domain/homology
Phospholipid-transporting ATPase IG / Cell cycle control protein 50A
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsQian Y / Abe K
Funding support Japan, 1 items
OrganizationGrant numberCountry
Japan Science and TechnologyJPMJR22E4 Japan
CitationJournal: J Biol Chem / Year: 2025
Title: Cryo-EM Structure of the ATP11C Q79E Mutant Reveals the Structural Basis for Altered Phospholipid Recognition.
Authors: Yuheng Qian / Chai C Gopalasingam / Christoph Gerle / Hideki Shigematsu / Kazuhiro Abe / Atsunori Oshima /
Abstract: Closely related P4-ATPases, ATP11A and ATP11C, act as major phospholipid flippases in the plasma membrane of mammalian cells, with strict substrate specificity for phosphatidylserine (PS) and ...Closely related P4-ATPases, ATP11A and ATP11C, act as major phospholipid flippases in the plasma membrane of mammalian cells, with strict substrate specificity for phosphatidylserine (PS) and phosphatidylethanolamine (PE), but not for phosphatidylcholine (PC), thereby contributing to the asymmetric distribution of PS and PE across bilayers. A previously reported disease-associated Q84E mutation in ATP11A confers the ability to flip PC, implicating the involvement of this conserved residue in substrate specificity. We performed cryo-EM analysis for the equivalent mutant Q79E of ATP11C to address the structural basis for its unusual substrate specificity. Measurement of ATPase activity revealed that the ATP11C Q79E mutant retained PS-dependent activity, whilst gaining robust PC-dependent activity, indicative of expanded substrate specificity, consistent with reported properties in ATP11A Q84E. The cryo-EM structure of ATP11C Q79E mutant in the PC-occluded E2-P state revealed a PC molecule in a reshaped binding pocket. Due to the Q79E mutation and associated conformational changes in its surrounding residues, including Ser91and Asn352, the binding pocket has additional space to accommodate the bulky choline headgroup. Our results provide structural and functional insights into how a single point mutation can alter substrate specificity in a P4-ATPase.
History
DepositionJul 4, 2025-
Header (metadata) releaseNov 26, 2025-
Map releaseNov 26, 2025-
UpdateNov 26, 2025-
Current statusNov 26, 2025Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_65258.png

Downloads & links

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Map

FileDownload / File: emd_65258.map.gz / Format: CCP4 / Size: 347.6 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
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Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.75 Å/pix.
x 450 pix.
= 338.4 Å		0.75 Å/pix.
x 450 pix.
= 338.4 Å		0.75 Å/pix.
x 450 pix.
= 338.4 Å

Surface

Projections

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.752 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.1
Minimum - Maximum-0.41737482 - 0.63153416
Average (Standard dev.)-0.00047010602 (±0.012929844)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions450450450
Spacing450450450
CellA=B=C: 338.4 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_65258_half_map_1.map
Projections & Slices
AxesZYX

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Density Histograms

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Half map: #1

Fileemd_65258_half_map_2.map
Projections & Slices
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Sample components

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Entire : ATP11C Q79A-CDC50A lipid flippase complex

EntireName: ATP11C Q79A-CDC50A lipid flippase complex
Components
  • Complex: ATP11C Q79A-CDC50A lipid flippase complex
    • Protein or peptide: Phospholipid-transporting ATPase IG
    • Protein or peptide: Cell cycle control protein 50A
  • Ligand: TETRAFLUOROALUMINATE ION
  • Ligand: MAGNESIUM ION
  • Ligand: O-[(R)-{[(2R)-2,3-bis(octadecanoyloxy)propyl]oxy}(hydroxy)phosphoryl]-L-serine
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: water

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Supramolecule #1: ATP11C Q79A-CDC50A lipid flippase complex

SupramoleculeName: ATP11C Q79A-CDC50A lipid flippase complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 170 kDa/nm

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Macromolecule #1: Phospholipid-transporting ATPase IG

MacromoleculeName: Phospholipid-transporting ATPase IG / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO / EC number: P-type phospholipid transporter
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 124.403617 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: RFCAGEEKRV GTRTVFVGNH PVSETEAYIA QRFCDNRIVS SKYTLWNFLP KNLFEQFRRI ANFYFLIIFL VQVTVDTPTS PVTSGLPLF FVITVTAIKQ GYEDWLRHRA DNEVNKSTVY IIENAKRVRK ESEKIKVGDV VEVQADETFP CDLILLSSCT T DGTCYVTT ...String:
RFCAGEEKRV GTRTVFVGNH PVSETEAYIA QRFCDNRIVS SKYTLWNFLP KNLFEQFRRI ANFYFLIIFL VQVTVDTPTS PVTSGLPLF FVITVTAIKQ GYEDWLRHRA DNEVNKSTVY IIENAKRVRK ESEKIKVGDV VEVQADETFP CDLILLSSCT T DGTCYVTT ASLDGESNCK THYAVRDTIA LCTAESIDTL RAAIECEQPQ PDLYKFVGRI NIYSNSLEAV ARSLGPENLL LK GATLKNT EKIYGVAVYT GMETKMALNY QGKSQKRSAV EKSINAFLIV YLFILLTKAA VCTTLKYVWQ STPYNDEPWY NQK TQKERE TLKVLKMFTD FLSFMVLFNF IIPVSMYVTV EMQKFLGSFF ISWDKDFYDE EINEGALVNT SDLNEELGQV DYVF TDKTG TLTENSMEFI ECCIDGHKYK GVTQEVDGLS QTDGTLTYFD KVDKNREELF LRALCLCHTV EIKTNDAVDG ATESA ELTY ISSSPDEIAL VKGAKRYGFT FLGNRNGYMR VENQRKEIEE YELLHTLNFD AVRRRMSVIV KTQEGDILLF CKGADS AVF PRVQNHEIEL TKVHVERNAM DGYRTLCVAF KEIAPDDYER INRQLIEAKM ALQDREEKME KVFDDIETNM NLIGATA VE DKLQDQAAET IEALHAAGLK VWVLTGDKME TAKSTCYACR LFQTNTELLE LTTKTIEESE RKEDRLHELL IEYRKKLL H EFPKSTRSFK KAWTEHQEYG LIIDGSTLSL ILNSSQDSSS NNYKSIFLQI CMKCTAVLCC RMAPLQKAQI VRMVKNLKG SPITLSIGDG ANDVSMILES HVGIGIKGKE GRQAARNSDY SVPKFKHLKK LLLAHGHLYY VRIAHLVQYF FYKNLCFILP QFLYQFFCG FSQQPLYDAA YLTMYNICFT SLPILAYSLL EQHINIDTLT SDPRLYMKIS GNAMLQLGPF LYWTFLAAFE G TVFFFGTY FLFQTASLEE NGKVYGNWTF GTIVFTVLVF TVTLKLALDT RFWTWINHFV IWGSLAFYVF FSFFWGGIIW PF LKQQRMY FVFAQMLSSV STWLAIILLI FISLFPEILL IVLKNVR

UniProtKB: Phospholipid-transporting ATPase IG

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Macromolecule #2: Cell cycle control protein 50A

MacromoleculeName: Cell cycle control protein 50A / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 40.900801 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MAMNYNAKDE VDGGPPCAPG GTAKTRRPDN TAFKQQRLPA WQPILTAGTV LPIFFIIGLI FIPIGIGIFV TSNNIREIEI DYTGTEPSS PCNKCLSPDV TPCFCTINFT LEKSFEGNVF MYYGLSNFYQ NHRRYVKSRD DSQLNGDSSA LLNPSKECEP Y RRNEDKPI ...String:
MAMNYNAKDE VDGGPPCAPG GTAKTRRPDN TAFKQQRLPA WQPILTAGTV LPIFFIIGLI FIPIGIGIFV TSNNIREIEI DYTGTEPSS PCNKCLSPDV TPCFCTINFT LEKSFEGNVF MYYGLSNFYQ NHRRYVKSRD DSQLNGDSSA LLNPSKECEP Y RRNEDKPI APCGAIMNSM FNDTLELFLI GQDSYPIPIA LKKKGIAWWT DKNVKFRNPP GGDNLEERFK GTTKPVNWLK PV YMLDSDP DNNGFINEDF IVWMRTAALP TFRKLYRLIE RKSDLHPTLP AGRYWLNVTY NYPVHYFDGR KRMILSTISW MGG KNPFLG IAYIAVGSIS FLLGVVLLVI NHKYRNSSNT ADITI

UniProtKB: Cell cycle control protein 50A

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Macromolecule #4: TETRAFLUOROALUMINATE ION

MacromoleculeName: TETRAFLUOROALUMINATE ION / type: ligand / ID: 4 / Number of copies: 1 / Formula: ALF
Molecular weightTheoretical: 102.975 Da
Chemical component information

ChemComp-ALF:
TETRAFLUOROALUMINATE ION

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Macromolecule #5: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 5 / Number of copies: 1 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Macromolecule #6: O-[(R)-{[(2R)-2,3-bis(octadecanoyloxy)propyl]oxy}(hydroxy)phospho...

MacromoleculeName: O-[(R)-{[(2R)-2,3-bis(octadecanoyloxy)propyl]oxy}(hydroxy)phosphoryl]-L-serine
type: ligand / ID: 6 / Number of copies: 1 / Formula: P5S
Molecular weightTheoretical: 792.075 Da
Chemical component information

ChemComp-P5S:
O-[(R)-{[(2R)-2,3-bis(octadecanoyloxy)propyl]oxy}(hydroxy)phosphoryl]-L-serine

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Macromolecule #7: 2-acetamido-2-deoxy-beta-D-glucopyranose

MacromoleculeName: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 7 / Number of copies: 3 / Formula: NAG
Molecular weightTheoretical: 221.208 Da
Chemical component information

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

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Macromolecule #8: water

MacromoleculeName: water / type: ligand / ID: 8 / Number of copies: 1 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration6 mg/mL
BufferpH: 6.5
GridModel: Quantifoil R1.2/1.3 / Material: COPPER/RHODIUM / Mesh: 200 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 120 sec.
Details: Glow discharge was performed on both sides of the grid
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277.15 K

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Electron microscopy

MicroscopeJEOL CRYO ARM 300
Specialist opticsEnergy filter - Name: In-column Omega Filter / Energy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 1 / Number real images: 7350 / Average electron dose: 60.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsCalibrated magnification: 60000 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.6 µm / Nominal defocus min: 1.2 µm
Sample stageSpecimen holder model: JEOL CRYOSPECPORTER / Cooling holder cryogen: NITROGEN

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Image processing

DetailsImages were collected using CDS mode
CTF correctionSoftware - Name: cryoSPARC (ver. 4.4) / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: OTHER / Details: Ab initio reconstruction using cryoSPARC
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 4.4) / Number images used: 84218
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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