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- PDB-8csx: Local refinement of RhAG/CE trimer in class 2 of erythrocyte anky... -

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Basic information

Entry
Database: PDB / ID: 8csx
TitleLocal refinement of RhAG/CE trimer in class 2 of erythrocyte ankyrin-1 complex
Components
  • Ammonium transporter Rh type A
  • Blood group Rh(CE) polypeptide
KeywordsTRANSPORT PROTEIN/STRUCTURAL PROTEIN / Membrane Protein / Anion Exchange / Erythrocyte / Glycoprotein / TRANSPORT PROTEIN-STRUCTURAL PROTEIN complex
Function / homology
Function and homology information


methylammonium transmembrane transport / Defective RHAG causes regulator type Rh-null hemolytic anemia (RHN) / Rhesus blood group biosynthesis / methylammonium transmembrane transporter activity / Rhesus glycoproteins mediate ammonium transport / carbon dioxide transmembrane transport / carbon dioxide transmembrane transporter activity / ammonium homeostasis / leak channel activity / ammonium transmembrane transport ...methylammonium transmembrane transport / Defective RHAG causes regulator type Rh-null hemolytic anemia (RHN) / Rhesus blood group biosynthesis / methylammonium transmembrane transporter activity / Rhesus glycoproteins mediate ammonium transport / carbon dioxide transmembrane transport / carbon dioxide transmembrane transporter activity / ammonium homeostasis / leak channel activity / ammonium transmembrane transport / intracellular monoatomic ion homeostasis / ankyrin-1 complex / ammonium channel activity / bicarbonate transport / : / ankyrin binding / erythrocyte development / carbon dioxide transport / Erythrocytes take up oxygen and release carbon dioxide / Erythrocytes take up carbon dioxide and release oxygen / multicellular organismal-level iron ion homeostasis / membrane / plasma membrane
Similarity search - Function
Blood group Rhesus C/E/D polypeptide / Ammonium transporter fold / Ammonium transporter AmtB like domains / Ammonium transporter AmtB-like domain / Ammonium Transporter Family / Ammonium/urea transporter / Orthogonal Bundle / Mainly Alpha
Similarity search - Domain/homology
CHOLESTEROL / Blood group Rh(CE) polypeptide / Ammonium transporter Rh type A
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.4 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 13, 2022Deposition site: RCSB / Processing site: RCSB
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
K: Blood group Rh(CE) polypeptide
L: Ammonium transporter Rh type A
Q: Ammonium transporter Rh type A
hetero molecules


Theoretical massNumber of molelcules
Total (without water)137,2907
Polymers134,0583
Non-polymers3,2324
Water2,702150
1


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

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Components

#1: Protein Blood group Rh(CE) polypeptide / Rh polypeptide 1 / RhPI / Rh30A / RhIXB / Rhesus C/E antigens


Mass: 45598.918 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P18577
#2: Protein Ammonium transporter Rh type A / Erythrocyte membrane glycoprotein Rh50 / Erythrocyte plasma membrane 50 kDa glycoprotein / Rh50A / ...Erythrocyte membrane glycoprotein Rh50 / Erythrocyte plasma membrane 50 kDa glycoprotein / Rh50A / Rhesus blood group family type A glycoprotein / Rh family type A glycoprotein / Rh type A glycoprotein / Rhesus blood group-associated ammonia channel / Rhesus blood group-associated glycoprotein


Mass: 44229.629 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: Q02094
#3: Chemical ChemComp-CLR / CHOLESTEROL


Mass: 386.654 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C27H46O
#4: Chemical ChemComp-AJP / Digitonin


Mass: 1229.312 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C56H92O29 / Comment: detergent*YM
#5: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 150 / Source method: isolated from a natural source / Formula: H2O
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: Class 1 of erythrocyte ankyrin complex (composite map)
Type: COMPLEX / Entity ID: #1-#2 / Source: NATURAL
Source (natural)Organism: Homo sapiens (human)
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
IDNameCategory
2Leginonimage acquisition
8PHENIXmodel refinement
13cryoSPARC3D 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: 2.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 145465 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0059199
ELECTRON MICROSCOPYf_angle_d0.69812528
ELECTRON MICROSCOPYf_dihedral_angle_d13.3243120
ELECTRON MICROSCOPYf_chiral_restr0.0471491
ELECTRON MICROSCOPYf_plane_restr0.0051505

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