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- PDB-7tw6: Cryo-EM structure of human ankyrin complex (B4P1A1) from red bloo... -

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Basic information

Entry
Database: PDB / ID: 7tw6
TitleCryo-EM structure of human ankyrin complex (B4P1A1) from red blood cell
Components
  • Ankyrin-1
  • Band 3 anion transport protein
  • Protein 4.2
KeywordsMEMBRANE PROTEIN / Red blood cell / Ankyrin complex / band 3 / protein 4.2
Function / homology
Function and homology information


spectrin-associated cytoskeleton / hemoglobin metabolic process / positive regulation of organelle organization / maintenance of epithelial cell apical/basal polarity / protein-glutamine gamma-glutamyltransferase activity / pH elevation / Defective SLC4A1 causes hereditary spherocytosis type 4 (HSP4), distal renal tubular acidosis (dRTA) and dRTA with hemolytic anemia (dRTA-HA) / negative regulation of urine volume / NrCAM interactions / Neurofascin interactions ...spectrin-associated cytoskeleton / hemoglobin metabolic process / positive regulation of organelle organization / maintenance of epithelial cell apical/basal polarity / protein-glutamine gamma-glutamyltransferase activity / pH elevation / Defective SLC4A1 causes hereditary spherocytosis type 4 (HSP4), distal renal tubular acidosis (dRTA) and dRTA with hemolytic anemia (dRTA-HA) / negative regulation of urine volume / NrCAM interactions / Neurofascin interactions / Bicarbonate transporters / intracellular monoatomic ion homeostasis / ankyrin-1 complex / CHL1 interactions / plasma membrane phospholipid scrambling / monoatomic anion transmembrane transporter activity / cytoskeletal anchor activity / chloride:bicarbonate antiporter activity / solute:inorganic anion antiporter activity / bicarbonate transport / bicarbonate transmembrane transporter activity / monoatomic anion transport / M band / chloride transmembrane transporter activity / Interaction between L1 and Ankyrins / chloride transport / ankyrin binding / hemoglobin binding / spectrin binding / erythrocyte maturation / negative regulation of glycolytic process through fructose-6-phosphate / cortical cytoskeleton / exocytosis / axolemma / endoplasmic reticulum to Golgi vesicle-mediated transport / erythrocyte development / COPI-mediated anterograde transport / protein-membrane adaptor activity / spleen development / cytoskeleton organization / chloride transmembrane transport / sarcoplasmic reticulum / protein localization to plasma membrane / regulation of intracellular pH / Erythrocytes take up oxygen and release carbon dioxide / Erythrocytes take up carbon dioxide and release oxygen / cell morphogenesis / sarcolemma / transmembrane transport / structural constituent of cytoskeleton / Z disc / multicellular organismal-level iron ion homeostasis / cytoplasmic side of plasma membrane / blood coagulation / regulation of cell shape / ATPase binding / protein phosphatase binding / basolateral plasma membrane / blood microparticle / transmembrane transporter binding / postsynaptic membrane / cytoskeleton / neuron projection / structural molecule activity / enzyme binding / signal transduction / protein homodimerization activity / extracellular exosome / ATP binding / membrane / plasma membrane / cytosol
Similarity search - Function
Ankyrin, UPA domain / UPA domain / : / Transglutaminase, N-terminal / Transglutaminase, C-terminal / Transglutaminase, active site / Protein-glutamine gamma-glutamyltransferase, animal / Transglutaminase, C-terminal domain superfamily / : / Transglutaminase family ...Ankyrin, UPA domain / UPA domain / : / Transglutaminase, N-terminal / Transglutaminase, C-terminal / Transglutaminase, active site / Protein-glutamine gamma-glutamyltransferase, animal / Transglutaminase, C-terminal domain superfamily / : / Transglutaminase family / Transglutaminase family, C-terminal ig like domain / Transglutaminases active site. / Domain present in ZO-1 and Unc5-like netrin receptors / ZU5 domain / ZU5 domain / ZU5 domain profile. / Transglutaminase-like superfamily / Transglutaminase/protease-like homologues / Transglutaminase-like / Anion exchange protein 1 / Transglutaminase-like superfamily / Anion exchange protein / Anion exchange, conserved site / Anion exchangers family signature 1. / Anion exchangers family signature 2. / Band 3 cytoplasmic domain / Band 3 cytoplasmic domain / Phosphotransferase/anion transporter / Bicarbonate transporter, eukaryotic / Bicarbonate transporter-like, transmembrane domain / HCO3- transporter integral membrane domain / Ankyrin repeat / Death domain profile. / DEATH domain, found in proteins involved in cell death (apoptosis). / Death domain / Death domain / Death-like domain superfamily / Ankyrin repeat / Papain-like cysteine peptidase superfamily / Ankyrin repeats (3 copies) / Ankyrin repeat profile. / Ankyrin repeat region circular profile. / ankyrin repeats / Ankyrin repeat / Ankyrin repeat-containing domain superfamily / Immunoglobulin E-set / Immunoglobulin-like fold
Similarity search - Domain/homology
Band 3 anion transport protein / Ankyrin-1 / Protein 4.2
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 5.6 Å
AuthorsXia, X. / Liu, S.H. / Zhou, Z.H.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)R01GM071940 United States
CitationJournal: Nat Struct Mol Biol / Year: 2022
Title: Structure, dynamics and assembly of the ankyrin complex on human red blood cell membrane.
Authors: Xian Xia / Shiheng Liu / Z Hong Zhou /
Abstract: The cytoskeleton of a red blood cell (RBC) is anchored to the cell membrane by the ankyrin complex. This complex is assembled during RBC genesis and comprises primarily band 3, protein 4.2 and ...The cytoskeleton of a red blood cell (RBC) is anchored to the cell membrane by the ankyrin complex. This complex is assembled during RBC genesis and comprises primarily band 3, protein 4.2 and ankyrin, whose mutations contribute to numerous human inherited diseases. High-resolution structures of the ankyrin complex have been long sought-after to understand its assembly and disease-causing mutations. Here, we analyzed native complexes on the human RBC membrane by stepwise fractionation. Cryo-electron microscopy structures of nine band-3-associated complexes reveal that protein 4.2 stabilizes the cytoplasmic domain of band 3 dimer. In turn, the superhelix-shaped ankyrin binds to this protein 4.2 via ankyrin repeats (ARs) 6-13 and to another band 3 dimer via ARs 17-20, bridging two band 3 dimers in the ankyrin complex. Integration of these structures with both prior data and our biochemical data supports a model of ankyrin complex assembly during erythropoiesis and identifies interactions essential for the mechanical stability of RBC.
History
DepositionFeb 6, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jun 8, 2022Provider: repository / Type: Initial release
Revision 1.1Jun 22, 2022Group: Database references / Category: citation / citation_author
Item: _citation.pdbx_database_id_PubMed / _citation.title ..._citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID / _citation_author.name
Revision 1.2Jul 27, 2022Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 1.3Feb 21, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Band 3 anion transport protein
B: Band 3 anion transport protein
E: Protein 4.2
G: Ankyrin-1
K: Band 3 anion transport protein
J: Band 3 anion transport protein


Theoretical massNumber of molelcules
Total (without water)691,1556
Polymers691,1556
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
Band 3 anion transport protein / Anion exchange protein 1 / AE 1 / Anion exchanger 1 / Solute carrier family 4 member 1


Mass: 101883.859 Da / Num. of mol.: 4 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P02730
#2: Protein Protein 4.2 / P4.2 / Erythrocyte membrane protein band 4.2 / Erythrocyte protein 4.2


Mass: 77096.914 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P16452
#3: Protein Ankyrin-1 / ANK-1 / Ankyrin-R / Erythrocyte ankyrin


Mass: 206522.625 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P16157

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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: High-salt fraction 2 from human red blood cell membrane
Type: COMPLEX / Entity ID: all / Source: NATURAL
Molecular weightValue: 0.68 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Buffer solutionpH: 7.5
Buffer component
IDConc.NameFormulaBuffer-ID
110 mMTris-HClNH2C(CH2OH)3HCl1
2300 mMSodium ChlorideNaCl1
31 mMDTTHSCH2CH(OH)CH(OH)CH2SH1
40.015 %DDMC24H46O111
SpecimenConc.: 2.5 mg/ml / Embedding 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
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 %

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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: 81000 X / Nominal defocus max: 3500 nm / Nominal defocus min: 1800 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Temperature (max): 100 K / Temperature (min): 100 K
Image recordingAverage exposure time: 2 sec. / Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 21187

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Processing

SoftwareName: PHENIX / Version: 1.19.2_4158: / Classification: refinement
EM software
IDNameVersionCategory
1Gautomatchparticle selection
2Topazparticle selection
3SerialEM3.9image acquisition
5CTFFIND4.1CTF correction
10RELION3.1initial Euler assignment
11cryoSPARC3final Euler assignment
12RELION3.1classification
13cryoSPARC33D reconstruction
14PHENIX1.19model refinement
CTF correctionType: PHASE FLIPPING ONLY
Particle selectionNum. of particles selected: 15351225
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 5.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 111308 / Symmetry type: POINT
Atomic model buildingProtocol: AB INITIO MODEL / Space: REAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00427770
ELECTRON MICROSCOPYf_angle_d0.75837757
ELECTRON MICROSCOPYf_dihedral_angle_d13.96810124
ELECTRON MICROSCOPYf_chiral_restr0.0444394
ELECTRON MICROSCOPYf_plane_restr0.0074851

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