7M1Q

Human ABCA4 structure in complex with N-ret-PE


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.92 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Cryo-EM structures of the ABCA4 importer reveal mechanisms underlying substrate binding and Stargardt disease.

Scortecci, J.F.Molday, L.L.Curtis, S.B.Garces, F.A.Panwar, P.Van Petegem, F.Molday, R.S.

(2021) Nat Commun 12: 5902-5902

  • DOI: https://doi.org/10.1038/s41467-021-26161-7
  • Primary Citation of Related Structures:  
    7M1P, 7M1Q

  • PubMed Abstract: 

    ABCA4 is an ATP-binding cassette (ABC) transporter that flips N-retinylidene-phosphatidylethanolamine (N-Ret-PE) from the lumen to the cytoplasmic leaflet of photoreceptor membranes. Loss-of-function mutations cause Stargardt disease (STGD1), a macular dystrophy associated with severe vision loss. To define the mechanisms underlying substrate binding and STGD1, we determine the cryo-EM structure of ABCA4 in its substrate-free and bound states. The two structures are similar and delineate an elongated protein with the two transmembrane domains (TMD) forming an outward facing conformation, extended and twisted exocytoplasmic domains (ECD), and closely opposed nucleotide binding domains. N-Ret-PE is wedged between the two TMDs and a loop from ECD1 within the lumen leaflet consistent with a lateral access mechanism and is stabilized through hydrophobic and ionic interactions with residues from the TMDs and ECDs. Our studies provide a framework for further elucidating the molecular mechanism associated with lipid transport and disease and developing promising disease interventions.


  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, BC, Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Retinal-specific phospholipid-transporting ATPase ABCA42,273Homo sapiensMutation(s): 0 
Gene Names: ABCA4ABCR
EC: 7.6.2.1
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P78363 (Homo sapiens)
Explore P78363 
Go to UniProtKB:  P78363
PHAROS:  P78363
GTEx:  ENSG00000198691 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP78363
Glycosylation
Glycosylation Sites: 8Go to GlyGen: P78363-1
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
B
5N/AN-Glycosylation
Glycosylation Resources
GlyTouCan:  G22768VO
GlyCosmos:  G22768VO
GlyGen:  G22768VO
Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
C
3N/AN-Glycosylation
Glycosylation Resources
GlyTouCan:  G15407YE
GlyCosmos:  G15407YE
GlyGen:  G15407YE
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
HZL (Subject of Investigation/LOI)
Query on HZL

Download Ideal Coordinates CCD File 
G [auth A][(2S)-3-[2-[(E)-[(2E,4E,6E,8E)-3,7-dimethyl-9-(2,6,6-trimethylcyclohexen-1-yl)nona-2,4,6,8-tetraenylidene]amino]ethoxy-oxidanyl-phosphoryl]oxy-2-[(Z)-octadec-9-enoyl]oxy-propyl] (Z)-octadec-9-enoate
C61 H104 N O8 P
DCJYQTYECYRVQM-JOQDOZEYSA-N
NAG
Query on NAG

Download Ideal Coordinates CCD File 
D [auth A]
E [auth A]
F [auth A]
H [auth A]
I [auth A]
D [auth A],
E [auth A],
F [auth A],
H [auth A],
I [auth A],
J [auth A]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
K [auth A]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.92 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Canadian Institutes of Health Research (CIHR)Canada--

Revision History  (Full details and data files)

  • Version 1.0: 2021-09-08
    Type: Initial release
  • Version 1.1: 2021-10-20
    Changes: Database references