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- PDB-9dbq: Cryo-EM structure of human ABCB6 transporter in an inward-facing ... -

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Basic information

Entry
Database: PDB / ID: 9dbq
TitleCryo-EM structure of human ABCB6 transporter in an inward-facing conformation
ComponentsATP-binding cassette sub-family B member 6
KeywordsMEMBRANE PROTEIN / transporter / ATPase
Function / homology
Function and homology information


Defective ABCB6 causes MCOPCB7 / cellular detoxification of cadmium ion / Mitochondrial ABC transporters / tetrapyrrole metabolic process / ABC-type heme transporter / porphyrin-containing compound metabolic process / tetrapyrrole binding / heme metabolic process / porphyrin-containing compound biosynthetic process / heme transport ...Defective ABCB6 causes MCOPCB7 / cellular detoxification of cadmium ion / Mitochondrial ABC transporters / tetrapyrrole metabolic process / ABC-type heme transporter / porphyrin-containing compound metabolic process / tetrapyrrole binding / heme metabolic process / porphyrin-containing compound biosynthetic process / heme transport / melanosome assembly / ABC-type heme transporter activity / heme transmembrane transport / melanosome membrane / multivesicular body membrane / mitochondrial envelope / endolysosome membrane / vacuolar membrane / skin development / efflux transmembrane transporter activity / intracellular copper ion homeostasis / ABC-type transporter activity / ATP-binding cassette (ABC) transporter complex / brain development / transmembrane transport / early endosome membrane / mitochondrial outer membrane / intracellular iron ion homeostasis / endosome / Golgi membrane / lysosomal membrane / heme binding / endoplasmic reticulum membrane / endoplasmic reticulum / Golgi apparatus / ATP hydrolysis activity / mitochondrion / extracellular exosome / nucleoplasm / ATP binding / plasma membrane / cytosol
Similarity search - Function
Mitochondrial ABC-transporter, N-terminal five TM domain / Mitochondrial ABC-transporter N-terminal five TM region / Type 1 protein exporter / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / ABC transporter-like, conserved site / ABC transporters family signature. / ABC transporter ...Mitochondrial ABC-transporter, N-terminal five TM domain / Mitochondrial ABC-transporter N-terminal five TM region / Type 1 protein exporter / ABC transporter transmembrane region / ABC transporter type 1, transmembrane domain / ABC transporter integral membrane type-1 fused domain profile. / ABC transporter type 1, transmembrane domain superfamily / 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
CHOLESTEROL HEMISUCCINATE / ATP-binding cassette sub-family B member 6
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsShaik, M.M. / Myasnikov, A. / Oldham, M.L. / Baril, S.A. / Kalathur, R.C. / Schuetz, J.D.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: Nat Commun / Year: 2024
Title: The role of ATP-binding Cassette subfamily B member 6 in the inner ear.
Authors: Stefanie A Baril / Katie A Wilson / Md Munan Shaik / Yu Fukuda / Robyn A Umans / Alessandro Barbieri / John Lynch / Tomoka Gose / Alexander Myasnikov / Michael L Oldham / Yao Wang / Jingwen ...Authors: Stefanie A Baril / Katie A Wilson / Md Munan Shaik / Yu Fukuda / Robyn A Umans / Alessandro Barbieri / John Lynch / Tomoka Gose / Alexander Myasnikov / Michael L Oldham / Yao Wang / Jingwen Zhu / Jie Fang / Jian Zuo / Ravi C Kalathur / Robert C Ford / Allison Coffin / Michael R Taylor / Megan L O'Mara / John D Schuetz /
Abstract: ABCB6 has been implicated in dyschromatosis universalis hereditaria, a condition characterized by hyperpigmented and hypopigmented skin macules. Dyschromatosis universalis hereditaria can also ...ABCB6 has been implicated in dyschromatosis universalis hereditaria, a condition characterized by hyperpigmented and hypopigmented skin macules. Dyschromatosis universalis hereditaria can also present with hearing loss. Dyschromatosis universalis hereditaria-associated mutations in ABCB6 have been reported, but the role of this protein in the inner ear has not been studied. Here we determine a high-resolution (2.93 Å) cryo-EM structure of ABCB6 and functionally characterized several dyschromatosis universalis hereditaria mutants. We find that the L356P mutant abolishes ABCB6 function, and affirm the underlying loss of ATP binding mechanism using molecular dynamics simulations based on our cryo-EM structure. To test the role of ABCB6 in the inner ear, we characterize Abcb6 (the ABCB6 homolog) in zebrafish. We show that Abcb6 suppression by morpholinos reduces inner ear and lateral line hair cell numbers. Morphants also lack the utricular otolith, which is associated with vestibular function. Co-injecting morpholinos with human ABCB6 mRNA partially rescues the morphant phenotype, suggesting that Abcb6 plays a developmental role in inner ear structures. Further, we show that Abcb6 knockout mice exhibit an increased auditory brainstem response threshold, resulting in reduced hearing sensitivity. Taken together, these data suggest ABCB6 plays a role in inner ear development and function.
History
DepositionAug 23, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 20, 2024Provider: repository / Type: Initial release
Revision 1.1Dec 4, 2024Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.identifier_ORCID / _citation_author.name / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: ATP-binding cassette sub-family B member 6
B: ATP-binding cassette sub-family B member 6
hetero molecules


Theoretical massNumber of molelcules
Total (without water)199,67722
Polymers189,9422
Non-polymers9,73520
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein ATP-binding cassette sub-family B member 6 / ABC-type heme transporter ABCB6 / Mitochondrial ABC transporter 3 / Mt-ABC transporter 3 / P- ...ABC-type heme transporter ABCB6 / Mitochondrial ABC transporter 3 / Mt-ABC transporter 3 / P-glycoprotein-related protein / Ubiquitously-expressed mammalian ABC half transporter


Mass: 94971.133 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: ABCB6, MTABC3, PRP, UMAT / Production host: Homo sapiens (human) / Strain (production host): Expi293 / References: UniProt: Q9NP58, ABC-type heme transporter
#2: Chemical
ChemComp-Y01 / CHOLESTEROL HEMISUCCINATE


Mass: 486.726 Da / Num. of mol.: 20 / Source method: obtained synthetically / Formula: C31H50O4
Has ligand of interestN
Has protein modificationN

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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: ABCB6 / Type: COMPLEX / Details: homodimer / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.189761 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human) / Strain: Expi293
Buffer solutionpH: 7.5
Details: 10 mM Tris, pH 7.5, 150 mM NaCl, 0.01% w/v DDM, 0.002% w/v CHS
Buffer component
IDConc.NameBuffer-ID
110 mMTris-HCl1
2150 mMsodium chloride1
30.2 mMdodecylmaltoside1
40.041 mMcholesteryl hemisuccinate1
SpecimenConc.: 3.6 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 400 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K

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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: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 130000 X / Nominal defocus max: 25000 nm / Nominal defocus min: 5000 nm / Cs: 2.7 mm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Temperature (min): 100 K
Image recordingAverage exposure time: 1.1 sec. / Electron dose: 66 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 7013

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Processing

EM software
IDNameCategory
1cryoSPARCparticle selection
2SerialEMimage acquisition
4cryoSPARCCTF correction
7Cootmodel fitting
9cryoSPARCinitial Euler assignment
10cryoSPARCfinal Euler assignment
11cryoSPARCclassification
12cryoSPARC3D reconstruction
13PHENIXmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 3344054 / Details: blob picker
SymmetryPoint symmetry: C2 (2 fold cyclic)
3D reconstructionResolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 1587831 / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingSpace: REAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00310308
ELECTRON MICROSCOPYf_angle_d0.54914088
ELECTRON MICROSCOPYf_dihedral_angle_d12.6284870
ELECTRON MICROSCOPYf_chiral_restr0.0351650
ELECTRON MICROSCOPYf_plane_restr0.0031676

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