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- PDB-8f5b: Human ABCA4 structure in complex with AMP-PNP -

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Basic information

Entry
Database: PDB / ID: 8f5b
TitleHuman ABCA4 structure in complex with AMP-PNP
ComponentsRetinal-specific phospholipid-transporting ATPase ABCA4
KeywordsTRANSPORT PROTEIN / ABC transporter / importer / membrane protein
Function / homology
Function and homology information


rod photoreceptor disc membrane / flippase activity / N-retinylidene-phosphatidylethanolamine flippase activity / Defective visual phototransduction due to ABCA4 loss of function / all-trans retinal binding / phospholipid transfer to membrane / retinol transmembrane transporter activity / phospholipid transporter activity / 11-cis retinal binding / retinal metabolic process ...rod photoreceptor disc membrane / flippase activity / N-retinylidene-phosphatidylethanolamine flippase activity / Defective visual phototransduction due to ABCA4 loss of function / all-trans retinal binding / phospholipid transfer to membrane / retinol transmembrane transporter activity / phospholipid transporter activity / 11-cis retinal binding / retinal metabolic process / ATPase-coupled intramembrane lipid transporter activity / phosphatidylethanolamine flippase activity / retinoid binding / photoreceptor cell maintenance / P-type phospholipid transporter / phospholipid translocation / lipid transport / The canonical retinoid cycle in rods (twilight vision) / phototransduction, visible light / photoreceptor outer segment / ATPase-coupled transmembrane transporter activity / ABC-type transporter activity / retinoid metabolic process / visual perception / ABC-family proteins mediated transport / transmembrane transport / photoreceptor disc membrane / cytoplasmic vesicle / GTPase activity / intracellular membrane-bounded organelle / endoplasmic reticulum / ATP hydrolysis activity / ATP binding / membrane / plasma membrane
Similarity search - Function
Retinal-specific ATP-binding cassette transporter / 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 ...Retinal-specific ATP-binding cassette transporter / 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
PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER / Retinal-specific phospholipid-transporting ATPase ABCA4
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.95 Å
AuthorsScortecci, J.F. / Van Petegem, F. / Molday, R.S.
Funding support Canada, 1items
OrganizationGrant numberCountry
Canadian Institutes of Health Research (CIHR)PJT175118 Canada
CitationJournal: J Biol Chem / Year: 2024
Title: Structural and functional characterization of the nucleotide-binding domains of ABCA4 and their role in Stargardt disease.
Authors: Jessica Fernandes Scortecci / Fabian A Garces / Jai K Mahto / Laurie L Molday / Filip Van Petegem / Robert S Molday /
Abstract: ABCA4 is an ATP-binding cassette (ABC) transporter that prevents the buildup of toxic retinoid compounds by facilitating the transport of N-retinylidene-phosphatidylethanolamine across membranes of ...ABCA4 is an ATP-binding cassette (ABC) transporter that prevents the buildup of toxic retinoid compounds by facilitating the transport of N-retinylidene-phosphatidylethanolamine across membranes of rod and cone photoreceptor cells. Over 1500 missense mutations in ABCA4, many in the nucleotide-binding domains (NBDs), have been genetically linked to Stargardt disease. Here, we show by cryo-EM that ABCA4 is converted from an open outward conformation to a closed conformation upon the binding of adenylyl-imidodiphosphate. Structural information and biochemical studies were used to further define the role of the NBDs in the functional properties of ABCA4 and the mechanisms by which mutations lead to the loss in activity. We show that ATPase activity in both NBDs is required for the functional activity of ABCA4. Mutations in Walker A asparagine residues cause a severe reduction in substrate-activated ATPase activity due to the loss in polar interactions with residues within the D-loops of the opposing NBD. The structural basis for how disease mutations in other NBD residues, including the R1108C, R2077W, R2107H, and L2027F, affect the structure and function of ABCA4 is described. Collectively, our studies provide insight into the structure and function of ABCA4 and mechanisms underlying Stargardt disease.
History
DepositionNov 13, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 22, 2023Provider: repository / Type: Initial release
Revision 2.0Aug 28, 2024Group: Advisory / Atomic model ...Advisory / Atomic model / Author supporting evidence / Data collection / Database references / Derived calculations / Refinement description / Structure summary
Category: atom_site / atom_site_anisotrop ...atom_site / atom_site_anisotrop / citation / citation_author / em_admin / em_software / entity / pdbx_branch_scheme / pdbx_contact_author / pdbx_entity_branch_descriptor / pdbx_entity_instance_feature / pdbx_entity_nonpoly / pdbx_nonpoly_scheme / pdbx_poly_seq_scheme / pdbx_struct_assembly / pdbx_struct_assembly_gen / pdbx_struct_conn_angle / pdbx_struct_oper_list / pdbx_struct_sheet_hbond / pdbx_unobs_or_zero_occ_atoms / pdbx_unobs_or_zero_occ_residues / pdbx_validate_close_contact / pdbx_validate_torsion / refine / refine_ls_restr / software / struct_asym / struct_conf / struct_conn / struct_sheet / struct_sheet_order / struct_sheet_range
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _em_admin.last_update / _entity.formula_weight / _entity.pdbx_description / _entity.pdbx_number_of_molecules / _pdbx_branch_scheme.auth_asym_id / _pdbx_branch_scheme.auth_seq_num / _pdbx_entity_branch_descriptor.descriptor / _pdbx_entity_nonpoly.comp_id / _pdbx_entity_nonpoly.name / _pdbx_poly_seq_scheme.auth_mon_id / _pdbx_poly_seq_scheme.auth_seq_num / _pdbx_poly_seq_scheme.pdb_mon_id / _pdbx_struct_assembly.details / _pdbx_struct_assembly_gen.asym_id_list / _pdbx_struct_conn_angle.ptnr1_auth_seq_id / _pdbx_struct_conn_angle.ptnr1_label_asym_id / _pdbx_struct_conn_angle.ptnr1_label_atom_id / _pdbx_struct_conn_angle.ptnr2_auth_seq_id / _pdbx_struct_conn_angle.ptnr2_label_asym_id / _pdbx_struct_conn_angle.ptnr3_auth_seq_id / _pdbx_struct_conn_angle.ptnr3_label_asym_id / _pdbx_struct_conn_angle.ptnr3_label_atom_id / _pdbx_struct_conn_angle.value / _pdbx_struct_oper_list.symmetry_operation / _refine.B_iso_mean / _refine.pdbx_ls_cross_valid_method / _refine.pdbx_stereochemistry_target_values / _refine_ls_restr.dev_ideal / _refine_ls_restr.number / _refine_ls_restr.type
Description: Atomic clashes
Details: clash score and Ramachandran outliers were corrected.
Provider: author / Type: Coordinate replacement
Revision 2.1Sep 18, 2024Group: Data collection / Database references / Category: citation / em_admin
Item: _citation.journal_volume / _citation.title / _em_admin.last_update
Revision 2.2Nov 20, 2024Group: Data collection / Structure summary
Category: em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Retinal-specific phospholipid-transporting ATPase ABCA4
hetero molecules


Theoretical massNumber of molelcules
Total (without water)258,6588
Polymers256,2031
Non-polymers2,4557
Water00
1


  • Idetical with deposited unit
  • defined by author&software
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Retinal-specific phospholipid-transporting ATPase ABCA4 / ATP-binding cassette sub-family A member 4 / RIM ABC transporter / RIM protein / RmP / Retinal- ...ATP-binding cassette sub-family A member 4 / RIM ABC transporter / RIM protein / RmP / Retinal-specific ATP-binding cassette transporter / Stargardt disease protein


Mass: 256202.531 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ABCA4, ABCR / Production host: Homo sapiens (human)
References: UniProt: P78363, P-type phospholipid transporter
#2: Polysaccharide beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 586.542 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2/a4-b1_b4-c1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{}}}LINUCSPDB-CARE
#3: Sugar ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0
#4: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION
#5: Chemical ChemComp-ANP / PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER


Mass: 506.196 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C10H17N6O12P3 / Feature type: SUBJECT OF INVESTIGATION / Comment: AMP-PNP, energy-carrying molecule analogue*YM
Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: ABCA4 structure in complex with AMP-PNP / Type: COMPLEX / Details: Recombinantly expressed human ABCA4 / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.25 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: UltrAuFoil R1.2/1.3
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2200 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARC3particle selection
4cryoSPARC3CTF correction
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 825604
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.95 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 149336 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00314802
ELECTRON MICROSCOPYf_angle_d0.57320128
ELECTRON MICROSCOPYf_dihedral_angle_d12.075353
ELECTRON MICROSCOPYf_chiral_restr0.0412308
ELECTRON MICROSCOPYf_plane_restr0.0042525

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