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- EMDB-30848: Structure of a human NHE1-CHP1 complex under pH 7.5 -

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Basic information

Entry
Database: EMDB / ID: EMD-30848
TitleStructure of a human NHE1-CHP1 complex under pH 7.5
Map data
Sample
  • Complex: Human NHE1-CHP1 complex under pH 7.5
    • Protein or peptide: Sodium/hydrogen exchanger 1
  • Ligand: 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine
KeywordsTransporter / MEMBRANE PROTEIN
Function / homology
Function and homology information


cation-transporting ATPase complex / Sodium/Proton exchangers / regulation of the force of heart contraction by cardiac conduction / Hyaluronan degradation / regulation of cardiac muscle cell membrane potential / cellular response to electrical stimulus / potassium:proton antiporter activity / positive regulation of action potential / sodium:proton antiporter activity / maintenance of cell polarity ...cation-transporting ATPase complex / Sodium/Proton exchangers / regulation of the force of heart contraction by cardiac conduction / Hyaluronan degradation / regulation of cardiac muscle cell membrane potential / cellular response to electrical stimulus / potassium:proton antiporter activity / positive regulation of action potential / sodium:proton antiporter activity / maintenance of cell polarity / regulation of pH / sodium ion export across plasma membrane / positive regulation of calcineurin-NFAT signaling cascade / cardiac muscle cell differentiation / protein phosphatase 2B binding / response to acidic pH / intracellular sodium ion homeostasis / regulation of stress fiber assembly / cellular response to acidic pH / cardiac muscle cell contraction / sodium ion import across plasma membrane / positive regulation of mitochondrial membrane permeability / regulation of cardiac muscle contraction by calcium ion signaling / regulation of focal adhesion assembly / cellular response to antibiotic / cellular response to cold / positive regulation of cardiac muscle hypertrophy / positive regulation of the force of heart contraction / protein complex oligomerization / intercalated disc / monoatomic ion transport / response to muscle stretch / phosphatidylinositol-4,5-bisphosphate binding / potassium ion transmembrane transport / cellular response to epinephrine stimulus / T-tubule / proton transmembrane transport / regulation of intracellular pH / stem cell differentiation / cellular response to mechanical stimulus / phospholipid binding / cellular response to insulin stimulus / calcium-dependent protein binding / cell migration / lamellipodium / positive regulation of cell growth / protein-macromolecule adaptor activity / basolateral plasma membrane / cellular response to hypoxia / molecular adaptor activity / calmodulin binding / positive regulation of apoptotic process / apical plasma membrane / membrane raft / focal adhesion / negative regulation of apoptotic process / perinuclear region of cytoplasm / cell surface / positive regulation of transcription by RNA polymerase II / mitochondrion / extracellular exosome / nucleoplasm / identical protein binding / membrane / plasma membrane / cytoplasm
Similarity search - Function
Sodium/hydrogen exchanger 1-like / Sodium/hydrogen exchanger, regulatory region / Regulatory region of Na+/H+ exchanger NHE binds to calmodulin / Na+/H+ exchanger / Cation/H+ exchanger, CPA1 family / Cation/H+ exchanger / Sodium/hydrogen exchanger, transmembrane
Similarity search - Domain/homology
Sodium/hydrogen exchanger 1
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsDong Y / Gao Y / Li B / Zhang XC / Zhao Y
CitationJournal: Nat Commun / Year: 2021
Title: Structure and mechanism of the human NHE1-CHP1 complex.
Authors: Yanli Dong / Yiwei Gao / Alina Ilie / DuSik Kim / Annie Boucher / Bin Li / Xuejun C Zhang / John Orlowski / Yan Zhao /
Abstract: Sodium/proton exchanger 1 (NHE1) is an electroneutral secondary active transporter present on the plasma membrane of most mammalian cells and plays critical roles in regulating intracellular pH and ...Sodium/proton exchanger 1 (NHE1) is an electroneutral secondary active transporter present on the plasma membrane of most mammalian cells and plays critical roles in regulating intracellular pH and volume homeostasis. Calcineurin B-homologous protein 1 (CHP1) is an obligate binding partner that promotes NHE1 biosynthetic maturation, cell surface expression and pH-sensitivity. Dysfunctions of either protein are associated with neurological disorders. Here, we elucidate structures of the human NHE1-CHP1 complex in both inward- and inhibitor (cariporide)-bound outward-facing conformations. We find that NHE1 assembles as a symmetrical homodimer, with each subunit undergoing an elevator-like conformational change during cation exchange. The cryo-EM map reveals the binding site for the NHE1 inhibitor cariporide, illustrating how inhibitors block transport activity. The CHP1 molecule differentially associates with these two conformational states of each NHE1 monomer, and this association difference probably underlies the regulation of NHE1 pH-sensitivity by CHP1.
History
DepositionJan 3, 2021-
Header (metadata) releaseJun 23, 2021-
Map releaseJun 23, 2021-
UpdateMar 27, 2024-
Current statusMar 27, 2024Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.021
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.021
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7dsw
  • Surface level: 0.03
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_30848.png

Downloads & links

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Map

FileDownload / File: emd_30848.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.04 Å/pix.
x 256 pix.
= 266.24 Å		1.04 Å/pix.
x 256 pix.
= 266.24 Å		1.04 Å/pix.
x 256 pix.
= 266.24 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.04 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.021 / Movie #1: 0.021
Minimum - Maximum-0.08706639 - 0.1570147
Average (Standard dev.)0.00011636937 (±0.0031310346)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 266.24 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.041.041.04
M x/y/z256256256
origin x/y/z0.0000.0000.000
length x/y/z266.240266.240266.240
α/β/γ90.00090.00090.000
start NX/NY/NZ192139186
NX/NY/NZ211274246
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS256256256
D min/max/mean-0.0870.1570.000

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Supplemental data

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Sample components

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Entire : Human NHE1-CHP1 complex under pH 7.5

EntireName: Human NHE1-CHP1 complex under pH 7.5
Components
  • Complex: Human NHE1-CHP1 complex under pH 7.5
    • Protein or peptide: Sodium/hydrogen exchanger 1
  • Ligand: 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine

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Supramolecule #1: Human NHE1-CHP1 complex under pH 7.5

SupramoleculeName: Human NHE1-CHP1 complex under pH 7.5 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Details: Calcineurin B homologous protein 1 (CHP1) was not successfully resolved in this map because of conformational heterogeneity.
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 230 KDa

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Macromolecule #1: Sodium/hydrogen exchanger 1

MacromoleculeName: Sodium/hydrogen exchanger 1 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 46.610219 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: KAFPVLGIDY THVRTPFEIS LWILLACLMK IGFHVIPTIS SIVPESCLLI VVGLLVGGLI KGVGETPPFL QSDVFFLFLL PPIILDAGY FLPLRQFTEN LGTILIFAVV GTLWNAFFLG GLMYAVCLVG GEQINNIGLL DNLLFGSIIS AVDPVAVLAV F EEIHINEL ...String:
KAFPVLGIDY THVRTPFEIS LWILLACLMK IGFHVIPTIS SIVPESCLLI VVGLLVGGLI KGVGETPPFL QSDVFFLFLL PPIILDAGY FLPLRQFTEN LGTILIFAVV GTLWNAFFLG GLMYAVCLVG GEQINNIGLL DNLLFGSIIS AVDPVAVLAV F EEIHINEL LHILVFGESL LNDAVTVVLY HLFEEFANYE HVGIVDIFLG FLSFFVVALG GVLVGVVYGV IAAFTSRFTS HI RVIEPLF VFLYSYMAYL SAELFHLSGI MALIASGVVM RPYVEANISH KSHTTIKYFL KMWSSVSETL IFIFLGVSTV AGS HHWNWT FVISTLLFCL IARVLGVLGL TWFINKFRIV KLTPKDQFII AYGGLRGAIA FSLGYLLDKK HFPMCDLFLT AIIT VIFFT VFVQGMTIRP LVDLL

UniProtKB: Sodium/hydrogen exchanger 1

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Macromolecule #2: 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine

MacromoleculeName: 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine / type: ligand / ID: 2 / Number of copies: 12 / Formula: LBN
Molecular weightTheoretical: 760.076 Da
Chemical component information

ChemComp-LBN:
1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine / phospholipid*YM

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration6 mg/mL
BufferpH: 6.5
GridModel: Quantifoil / Material: COPPER / Mesh: 200 / Support film - Material: CARBON / Support film - topology: HOLEY
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK III
DetailsThe NHE1-CHP1 complex was reconstituted into lipid nanodiscs.

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Specialist opticsEnergy filter - Name: GIF Bioquantum / Energy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Digitization - Dimensions - Width: 3838 pixel / Digitization - Dimensions - Height: 3710 pixel / Digitization - Frames/image: 1-32 / Number grids imaged: 1 / Number real images: 2462 / Average electron dose: 60.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.2 µm / Nominal defocus min: 1.2 µm / Nominal magnification: 13000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: INSILICO MODEL
In silico model: The insilico model was generated using Ab initio reconstruction in cryoSPARC.
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.1) / Number images used: 108712
Initial angle assignmentType: ANGULAR RECONSTITUTION / Software: (Name: RELION (ver. 3.1), cryoSPARC (ver. 2.15))
Final angle assignmentType: ANGULAR RECONSTITUTION / Software - Name: RELION (ver. 3.1)
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementProtocol: AB INITIO MODEL
Output model

PDB-7dsw:
Structure of a human NHE1-CHP1 complex under pH 7.5

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