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- PDB-8yr4: Cryo-EM structure of the human ABCB6 in complex with Cd(II):Phyto... -

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Basic information

Entry
Database: PDB / ID: 8yr4
TitleCryo-EM structure of the human ABCB6 in complex with Cd(II):Phytochelatin 2
Components
  • (Phytochelatin 2) x 2
  • ATP-binding cassette sub-family B member 6
KeywordsMEMBRANE PROTEIN / Cryo-EM / ABC transporter / ATP-binding cassette transporter B6 / ABCB6 / heme biosynthesis / heavy metal detoxification / glutathione / phytochelatin
Function / homology
Function and homology information


cellular detoxification of cadmium ion / Defective ABCB6 causes MCOPCB7 / heme transmembrane transport / Mitochondrial ABC transporters / tetrapyrrole metabolic process / ABC-type heme transporter / ABC-type heme transporter activity / porphyrin-containing compound metabolic process / heme transport / tetrapyrrole binding ...cellular detoxification of cadmium ion / Defective ABCB6 causes MCOPCB7 / heme transmembrane transport / Mitochondrial ABC transporters / tetrapyrrole metabolic process / ABC-type heme transporter / ABC-type heme transporter activity / porphyrin-containing compound metabolic process / heme transport / tetrapyrrole binding / heme metabolic process / porphyrin-containing compound biosynthetic process / melanosome assembly / 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 / intracellular iron ion homeostasis / mitochondrial outer membrane / endosome / lysosomal membrane / Golgi membrane / heme binding / endoplasmic reticulum membrane / Golgi apparatus / endoplasmic reticulum / 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
: / : / GAMMA-D-GLUTAMIC ACID / ATP-binding cassette sub-family B member 6
Similarity search - Component
Biological speciesHomo sapiens (human)
Tracheophyta (vascular plants)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsChoi, S.H. / Lee, S.S. / Lee, H.Y. / Kim, S. / Kim, J.W. / Jin, M.S.
Funding support Korea, Republic Of, 3items
OrganizationGrant numberCountry
National Research Foundation (NRF, Korea)NRF-2019M3E5D6063908 Korea, Republic Of
National Research Foundation (NRF, Korea)NRF-2021M3A9I4022846 Korea, Republic Of
National Research Foundation (NRF, Korea)NRF-2022R1A2C1091278 Korea, Republic Of
CitationJournal: Commun Biol / Year: 2024
Title: Cryo-EM structure of cadmium-bound human ABCB6.
Authors: Seung Hun Choi / Sang Soo Lee / Hyeon You Lee / Subin Kim / Ji Won Kim / Mi Sun Jin /
Abstract: ATP-binding cassette transporter B6 (ABCB6), a protein essential for heme biosynthesis in mitochondria, also functions as a heavy metal efflux pump. Here, we present cryo-electron microscopy ...ATP-binding cassette transporter B6 (ABCB6), a protein essential for heme biosynthesis in mitochondria, also functions as a heavy metal efflux pump. Here, we present cryo-electron microscopy structures of human ABCB6 bound to a cadmium Cd(II) ion in the presence of antioxidant thiol peptides glutathione (GSH) and phytochelatin 2 (PC2) at resolutions of 3.2 and 3.1 Å, respectively. The overall folding of the two structures resembles the inward-facing apo state but with less separation between the two halves of the transporter. Two GSH molecules are symmetrically bound to the Cd(II) ion in a bent conformation, with the central cysteine protruding towards the metal. The N-terminal glutamate and C-terminal glycine of GSH do not directly interact with Cd(II) but contribute to neutralizing positive charges of the binding cavity by forming hydrogen bonds and van der Waals interactions with nearby residues. In the presence of PC2, Cd(II) binding to ABCB6 is similar to that observed with GSH, except that two cysteine residues of each PC2 molecule participate in Cd(II) coordination to form a tetrathiolate. Structural comparison of human ABCB6 and its homologous Atm-type transporters indicate that their distinct substrate specificity might be attributed to variations in the capping residues situated at the top of the substrate-binding cavity.
History
DepositionMar 20, 2024Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jun 19, 2024Provider: repository / Type: Initial release

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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
F: Phytochelatin 2
H: Phytochelatin 2
I: Phytochelatin 2
J: Phytochelatin 2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)144,7029
Polymers144,2956
Non-polymers4073
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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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: 71719.039 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: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q9NP58, ABC-type heme transporter
#2: Protein/peptide Phytochelatin 2


Type: Peptide-like / Mass: 250.272 Da / Num. of mol.: 2 / Source method: obtained synthetically / Source: (synth.) Tracheophyta (vascular plants) / References: BIRD: PRD_002423
#3: Protein/peptide Phytochelatin 2


Type: Peptide-like / Mass: 178.210 Da / Num. of mol.: 2 / Source method: obtained synthetically / Source: (synth.) Tracheophyta (vascular plants) / References: BIRD: PRD_002423
#4: Chemical ChemComp-FGA / GAMMA-D-GLUTAMIC ACID / D-GLUTAMIC ACID


Type: D-gamma-peptide, C-delta linking, Peptide-like / Mass: 147.129 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C5H9NO4 / References: BIRD: PRD_002423
#5: Chemical ChemComp-CD / CADMIUM ION


Mass: 112.411 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Cd / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY

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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: Homodimer of ATP-binding cassette transporter B6 in complex with Cd(II):Phytochelatin 2
Type: ORGANELLE OR CELLULAR COMPONENT / Entity ID: #1-#3 / Source: RECOMBINANT
Molecular weightValue: 143.2 kDa/nm / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

MicroscopyModel: TFS TALOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: SPOT SCAN
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2200 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.20.1_4487: / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 398301 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0039504
ELECTRON MICROSCOPYf_angle_d0.66612886
ELECTRON MICROSCOPYf_dihedral_angle_d4.7641336
ELECTRON MICROSCOPYf_chiral_restr0.0471488
ELECTRON MICROSCOPYf_plane_restr0.0041634

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