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- EMDB-32233: Cryo-EM structure of nucleotide-free ABCA3 -

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Basic information

Entry
Database: EMDB / ID: EMD-32233
TitleCryo-EM structure of nucleotide-free ABCA3
Map data
Sample
  • Complex: ABCA3
    • Protein or peptide: Phospholipid-transporting ATPase ABCA3
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: 1,2-DIMYRISTOYL-SN-GLYCERO-3-PHOSPHOCHOLINE
  • Ligand: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
KeywordsABC transporter / MEMBRANE PROTEIN / TRANSLOCASE
Function / homology
Function and homology information


positive regulation of protein homooligomerization / lamellar body membrane / Defective ABCA3 causes SMDP3 / Defective ABCA3 causes SMDP3 / regulation of phosphatidylcholine metabolic process / alveolar lamellar body membrane / lamellar body / phosphatidylcholine transfer activity / positive regulation of phospholipid transport / alveolar lamellar body ...positive regulation of protein homooligomerization / lamellar body membrane / Defective ABCA3 causes SMDP3 / Defective ABCA3 causes SMDP3 / regulation of phosphatidylcholine metabolic process / alveolar lamellar body membrane / lamellar body / phosphatidylcholine transfer activity / positive regulation of phospholipid transport / alveolar lamellar body / xenobiotic export from cell / organelle assembly / phosphatidylcholine flippase activity / ABC transporters in lipid homeostasis / phosphatidylglycerol metabolic process / regulation of lipid biosynthetic process / phosphatidylcholine metabolic process / positive regulation of phospholipid efflux / lipid transporter activity / phospholipid transport / Surfactant metabolism / phospholipid homeostasis / xenobiotic transmembrane transport / multivesicular body membrane / P-type phospholipid transporter / surfactant homeostasis / ABC-type xenobiotic transporter / ABC-type xenobiotic transporter activity / xenobiotic transport / lipid transport / ATPase-coupled transmembrane transporter activity / positive regulation of cholesterol efflux / lung development / response to glucocorticoid / cytoplasmic vesicle membrane / late endosome / response to xenobiotic stimulus / lysosomal membrane / intracellular membrane-bounded organelle / ATP hydrolysis activity / extracellular space / ATP binding / plasma membrane
Similarity search - Function
ABC transporter A / : / ABCA1-like, C-terminal R1 regulatory domain / ABC-2 family transporter protein / ABC-2 type transporter / 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. ...ABC transporter A / : / ABCA1-like, C-terminal R1 regulatory domain / ABC-2 family transporter protein / ABC-2 type transporter / 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
Similarity search - Domain/homology
Phospholipid-transporting ATPase ABCA3
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsXie T / Zhang ZK / Yue J / Gong X
Funding support1 items
OrganizationGrant numberCountry
Not funded
CitationJournal: Sci Adv / Year: 2022
Title: Cryo-EM structures of the human surfactant lipid transporter ABCA3.
Authors: Tian Xie / Zike Zhang / Jian Yue / Qi Fang / Xin Gong /
Abstract: The adenosine 5'-triphosphate (ATP)-binding cassette (ABC) transporter ABCA3 plays a critical role in pulmonary surfactant biogenesis. Mutations in human ABCA3 have been recognized as the most ...The adenosine 5'-triphosphate (ATP)-binding cassette (ABC) transporter ABCA3 plays a critical role in pulmonary surfactant biogenesis. Mutations in human ABCA3 have been recognized as the most frequent causes of inherited surfactant dysfunction disorders. Despite two decades of research, in vitro biochemical and structural studies of ABCA3 are still lacking. Here, we report the cryo-EM structures of human ABCA3 in two distinct conformations, both at resolution of 3.3 Å. In the absence of ATP, ABCA3 adopts a "lateral-opening" conformation with the lateral surfaces of transmembrane domains (TMDs) exposed to the membrane and features two positively charged cavities within the TMDs as potential substrate binding sites. ATP binding induces pronounced conformational changes, resulting in the collapse of the potential substrate binding cavities. Our results help to rationalize the disease-causing mutations in human ABCA3 and suggest a conserved "lateral access and extrusion" mechanism for both lipid export and import mediated by ABCA transporters.
History
DepositionNov 17, 2021-
Header (metadata) releaseApr 27, 2022-
Map releaseApr 27, 2022-
UpdateJun 25, 2025-
Current statusJun 25, 2025Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_32233.png

Downloads & links

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Map

FileDownload / File: emd_32233.map.gz / Format: CCP4 / Size: 52.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.08 Å/pix.
x 240 pix.
= 259.2 Å		1.08 Å/pix.
x 240 pix.
= 259.2 Å		1.08 Å/pix.
x 240 pix.
= 259.2 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.08 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.025
Minimum - Maximum-0.10173161 - 0.19456655
Average (Standard dev.)-0.00023814602 (±0.006231916)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions240240240
Spacing240240240
CellA=B=C: 259.2 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : ABCA3

EntireName: ABCA3
Components
  • Complex: ABCA3
    • Protein or peptide: Phospholipid-transporting ATPase ABCA3
  • Ligand: 2-acetamido-2-deoxy-beta-D-glucopyranose
  • Ligand: 1,2-DIMYRISTOYL-SN-GLYCERO-3-PHOSPHOCHOLINE
  • Ligand: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate

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Supramolecule #1: ABCA3

SupramoleculeName: ABCA3 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Phospholipid-transporting ATPase ABCA3

MacromoleculeName: Phospholipid-transporting ATPase ABCA3 / 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: 196.513656 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MADYKDDDDK SGPDEVDASG RMAVLRQLAL LLWKNYTLQK RKVLVTVLEL FLPLLFSGIL IWLRLKIQSE NVPNATIYPG QSIQELPLF FTFPPPGDTW ELAYIPSHSD AAKTVTETVR RALVINMRVR GFPSEKDFED YIRYDNCSSS VLAAVVFEHP F NHSKEPLP ...String:
MADYKDDDDK SGPDEVDASG RMAVLRQLAL LLWKNYTLQK RKVLVTVLEL FLPLLFSGIL IWLRLKIQSE NVPNATIYPG QSIQELPLF FTFPPPGDTW ELAYIPSHSD AAKTVTETVR RALVINMRVR GFPSEKDFED YIRYDNCSSS VLAAVVFEHP F NHSKEPLP LAVKYHLRFS YTRRNYMWTQ TGSFFLKETE GWHTTSLFPL FPNPGPREPT SPDGGEPGYI REGFLAVQHA VD RAIMEYH ADAATRQLFQ RLTVTIKRFP YPPFIADPFL VAIQYQLPLL LLLSFTYTAL TIARAVVQEK ERRLKEYMRM MGL SSWLHW SAWFLLFFLF LLIAASFMTL LFCVKVKPNV AVLSRSDPSL VLAFLLCFAI STISFSFMVS TFFSKANMAA AFGG FLYFF TYIPYFFVAP RYNWMTLSQK LCSCLLSNVA MAMGAQLIGK FEAKGMGIQW RDLLSPVNVD DDFCFGQVLG MLLLD SVLY GLVTWYMEAV FPGQFGVPQP WYFFIMPSYW CGKPRAVAGK EEEDSDPEKA LRNEYFEAEP EDLVAGIKIK HLSKVF RVG NKDRAAVRDL NLNLYEGQIT VLLGHNGAGK TTTLSMLTGL FPPTSGRAYI SGYEISQDMV QIRKSLGLCP QHDILFD NL TVAEHLYFYA QLKGLSRQKC PEEVKQMLHI IGLEDKWNSR SRFLSGGMRR KLSIGIALIA GSKVLILDEP TSGMDAIS R RAIWDLLQRQ KSDRTIVLTT HFMDEADLLG DRIAIMAKGE LQCCGSSLFL KQKYGAGYHM TLVKEPHCNP EDISQLVHH HVPNATLESS AGAELSFILP RESTHRFEGL FAKLEKKQKE LGIASFGASI TTMEEVFLRV GKLVDSSMDI QAIQLPALQY QHERRASDW AVDSNLCGAM DPSDGIGALI EEERTAVKLN TGLALHCQQF WAMFLKKAAY SWREWKMVAA QVLVPLTCVT L ALLAINYS SELFDDPMLR LTLGEYGRTV VPFSVPGTSQ LGQQLSEHLK DALQAEGQEP REVLGDLEEF LIFRASVEGG GF NERCLVA ASFRDVGERT VVNALFNNQA YHSPATALAV VDNLLFKLLC GPHASIVVSN FPQPRSALQA AKDQFNEGRK GFD IALNLL FAMAFLASTF SILAVSERAV QAKHVQFVSG VHVASFWLSA LLWDLISFLI PSLLLLVVFK AFDVRAFTRD GHMA DTLLL LLLYGWAIIP LMYLMNFFFL GAATAYTRLT IFNILSGIAT FLMVTIMRIP AVKLEELSKT LDHVFLVLPN HCLGM AVSS FYENYETRRY CTSSEVAAHY CKKYNIQYQE NFYAWSAPGV GRFVASMAAS GCAYLILLFL IETNLLQRLR GILCAL RRR RTLTELYTRM PVLPEDQDVA DERTRILAPS PDSLLHTPLI IKELSKVYEQ RVPLLAVDRL SLAVQKGECF GLLGFNG AG KTTTFKMLTG EESLTSGDAF VGGHRISSDV GKVRQRIGYC PQFDALLDHM TGREMLVMYA RLRGIPERHI GACVENTL R GLLLEPHANK LVRTYSGGNK RKLSTGIALI GEPAVIFLDE PSTGMDPVAR RLLWDTVARA RESGKAIIIT SHSMEECEA LCTRLAIMVQ GQFKCLGSPQ HLKSKFGSGY SLRAKVQSEG QQEALEEFKA FVDLTFPGSV LEDEHQGMVH YHLPGRDLSW AKVFGILEK AKEKYGVDDY SVSQISLEQV FLSFAHLQPP TAEEGRLEGS DEVDAVEGSH HHHHHHHHH

UniProtKB: Phospholipid-transporting ATPase ABCA3

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

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

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

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Macromolecule #3: 1,2-DIMYRISTOYL-SN-GLYCERO-3-PHOSPHOCHOLINE

MacromoleculeName: 1,2-DIMYRISTOYL-SN-GLYCERO-3-PHOSPHOCHOLINE / type: ligand / ID: 3 / Number of copies: 2 / Formula: PX4
Molecular weightTheoretical: 678.94 Da
Chemical component information

ChemComp-PX4:
1,2-DIMYRISTOYL-SN-GLYCERO-3-PHOSPHOCHOLINE / DMPC, phospholipid*YM

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Macromolecule #4: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(tri...

MacromoleculeName: (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate
type: ligand / ID: 4 / Number of copies: 3 / Formula: POV
Molecular weightTheoretical: 760.076 Da
Chemical component information

ChemComp-POV:
(2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate / phospholipid*YM

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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

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: NONE
Startup modelType of model: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 111435
Initial angle assignmentType: NOT APPLICABLE
Final angle assignmentType: NOT APPLICABLE

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