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- PDB-7v0q: Local refinement of protein 4.2, class 1 of erythrocyte ankyrin-1... -

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Basic information

Entry
Database: PDB / ID: 7v0q
TitleLocal refinement of protein 4.2, class 1 of erythrocyte ankyrin-1 complex
ComponentsProtein 4.2
KeywordsSTRUCTURAL PROTEIN / Membrane Protein / ankyrin complex / Erythrocyte
Function / homology
Function and homology information


hemoglobin metabolic process / protein-glutamine gamma-glutamyltransferase activity / ankyrin-1 complex / erythrocyte maturation / cortical cytoskeleton / spleen development / structural constituent of cytoskeleton / multicellular organismal-level iron ion homeostasis / cell morphogenesis / regulation of cell shape ...hemoglobin metabolic process / protein-glutamine gamma-glutamyltransferase activity / ankyrin-1 complex / erythrocyte maturation / cortical cytoskeleton / spleen development / structural constituent of cytoskeleton / multicellular organismal-level iron ion homeostasis / cell morphogenesis / regulation of cell shape / cytoskeleton / ATP binding / plasma membrane
Similarity search - Function
Coagulation Factor XIII; Chain A, domain 2 / Transglutaminase-like / 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 ...Coagulation Factor XIII; Chain A, domain 2 / Transglutaminase-like / 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. / Transglutaminase-like superfamily / Transglutaminase/protease-like homologues / Transglutaminase-like / Transglutaminase-like superfamily / Papain-like cysteine peptidase superfamily / Immunoglobulin E-set / Immunoglobulin-like fold / Immunoglobulins / Alpha-Beta Complex / Immunoglobulin-like / Sandwich / Mainly Beta / Alpha Beta
Similarity search - Domain/homology
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.5 Å
AuthorsVallese, F. / Kim, K. / Yen, L.Y. / Johnston, J.D. / Noble, A.J. / Cali, T. / Clarke, O.B.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: Nat Struct Mol Biol / Year: 2022
Title: Architecture of the human erythrocyte ankyrin-1 complex.
Authors: Francesca Vallese / Kookjoo Kim / Laura Y Yen / Jake D Johnston / Alex J Noble / Tito Calì / Oliver Biggs Clarke /
Abstract: The stability and shape of the erythrocyte membrane is provided by the ankyrin-1 complex, but how it tethers the spectrin-actin cytoskeleton to the lipid bilayer and the nature of its association ...The stability and shape of the erythrocyte membrane is provided by the ankyrin-1 complex, but how it tethers the spectrin-actin cytoskeleton to the lipid bilayer and the nature of its association with the band 3 anion exchanger and the Rhesus glycoproteins remains unknown. Here we present structures of ankyrin-1 complexes purified from human erythrocytes. We reveal the architecture of a core complex of ankyrin-1, the Rhesus proteins RhAG and RhCE, the band 3 anion exchanger, protein 4.2, glycophorin A and glycophorin B. The distinct T-shaped conformation of membrane-bound ankyrin-1 facilitates recognition of RhCE and, unexpectedly, the water channel aquaporin-1. Together, our results uncover the molecular details of ankyrin-1 association with the erythrocyte membrane, and illustrate the mechanism of ankyrin-mediated membrane protein clustering.
History
DepositionMay 10, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 20, 2022Provider: repository / Type: Initial release
Revision 1.1Jul 27, 2022Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2Feb 14, 2024Group: Data collection / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_3d_fitting_list / pdbx_initial_refinement_model
Item: _em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id ..._em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id / _em_3d_fitting_list.source_name / _em_3d_fitting_list.type

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
X: Protein 4.2


Theoretical massNumber of molelcules
Total (without water)77,0971
Polymers77,0971
Non-polymers00
Water2,288127
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Antibody 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
#2: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 127 / Source method: isolated from a natural source / Formula: H2O

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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: Erythrocyte ankyrin-1 complex / Type: COMPLEX
Details: Purified by density gradient centrifugation and size exclusion chromatography from digitonin-solubilized erythrocyte membranes.
Entity ID: #1 / Source: NATURAL
Source (natural)Organism: Homo sapiens (human) / Cellular location: Plasma membrane / Organ: Blood / Tissue: Erythrocytes
Buffer solutionpH: 7.4
Details: Final gel filtration buffer contained 0.05% w/v digitonin, 130 mM KCl, 20 mM HEPES, pH 7.4, 1 mM ATP, 1 mM MgCl2, 1 mM PMSF. Peak fractions were concentrated to 8 mg/mL, and 0.01% w/v ...Details: Final gel filtration buffer contained 0.05% w/v digitonin, 130 mM KCl, 20 mM HEPES, pH 7.4, 1 mM ATP, 1 mM MgCl2, 1 mM PMSF. Peak fractions were concentrated to 8 mg/mL, and 0.01% w/v glycyrrhizic acid was added immediately prior to vitrification.
SpecimenConc.: 8 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: Ankyrin complex mixture purified from digitonin-solubilized erythrocyte ghost membranes
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K / Details: 4-6 seconds, wait time 30 seconds.

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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 defocus max: 1500 nm / Nominal defocus min: 500 nm / Cs: 2.7 mm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 2.5 sec. / Electron dose: 58 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 2 / Num. of real images: 14464 / Details: Two grids were imaged in a single session.
EM imaging opticsEnergyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV

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Processing

SoftwareName: PHENIX / Version: 1.20.1_4487: / Classification: refinement
EM software
IDNameVersionCategory
2Leginonimage acquisition
4cryoSPARC3CTF correction
7Coot0.9.8model fitting
9PHENIX1.20.1model refinement
10cryoSPARC3initial Euler assignment
11cryoSPARC3final Euler assignment
13cryoSPARC33D reconstruction
CTF correctionDetails: Patch CTF (cryoSPARC v3) followed by per particle defocus refinement and refinement of higher order aberrations (cryoSPARC v3)
Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 126197 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Atomic model buildingPDB-ID: 4YZF

4yzf


Pdb chain-ID: A / Accession code: 4YZF / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0045281
ELECTRON MICROSCOPYf_angle_d0.5757166
ELECTRON MICROSCOPYf_dihedral_angle_d4.573712
ELECTRON MICROSCOPYf_chiral_restr0.043811
ELECTRON MICROSCOPYf_plane_restr0.005923

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