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- PDB-8wa5: Cryo-EM structure of the gastric proton pump Y799W/E936Q mutant i... -

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Basic information

Entry
Database: PDB / ID: 8wa5
TitleCryo-EM structure of the gastric proton pump Y799W/E936Q mutant in K+-occluded (K+)E2-AlF state
Components
  • Potassium-transporting ATPase subunit beta
  • Sodium/potassium-transporting ATPase subunit alpha
KeywordsMEMBRANE PROTEIN / P-type ATPase / gastric proton pump / primary transporter / transporter
Function / homology
Function and homology information


regulation of proton transport / pH reduction / potassium:proton exchanging ATPase complex / P-type potassium:proton transporter activity / Ion transport by P-type ATPases / P-type sodium:potassium-exchanging transporter activity / sodium:potassium-exchanging ATPase complex / sodium ion export across plasma membrane / intracellular potassium ion homeostasis / intracellular sodium ion homeostasis ...regulation of proton transport / pH reduction / potassium:proton exchanging ATPase complex / P-type potassium:proton transporter activity / Ion transport by P-type ATPases / P-type sodium:potassium-exchanging transporter activity / sodium:potassium-exchanging ATPase complex / sodium ion export across plasma membrane / intracellular potassium ion homeostasis / intracellular sodium ion homeostasis / potassium ion import across plasma membrane / ATPase activator activity / potassium ion transmembrane transport / proton transmembrane transport / cell adhesion / response to xenobiotic stimulus / apical plasma membrane / magnesium ion binding / ATP hydrolysis activity / ATP binding
Similarity search - Function
Gastric H+/K+-transporter P-type ATPase, N-terminal / Gastric H+/K+-ATPase, N terminal domain / Sodium/potassium-transporting ATPase subunit beta / Sodium/potassium-transporting ATPase subunit beta superfamily / Sodium / potassium ATPase beta chain / Sodium and potassium ATPases beta subunits signature 1. / Sodium and potassium ATPases beta subunits signature 2. / P-type ATPase subfamily IIC, subunit alpha / Cation-transporting P-type ATPase, C-terminal / Cation transporting ATPase, C-terminus ...Gastric H+/K+-transporter P-type ATPase, N-terminal / Gastric H+/K+-ATPase, N terminal domain / Sodium/potassium-transporting ATPase subunit beta / Sodium/potassium-transporting ATPase subunit beta superfamily / Sodium / potassium ATPase beta chain / Sodium and potassium ATPases beta subunits signature 1. / Sodium and potassium ATPases beta subunits signature 2. / P-type ATPase subfamily IIC, subunit alpha / Cation-transporting P-type ATPase, C-terminal / Cation transporting ATPase, C-terminus / Cation transporter/ATPase, N-terminus / Cation-transporting P-type ATPase, N-terminal / Cation transporter/ATPase, N-terminus / Cation transport ATPase (P-type) / E1-E2 ATPase / P-type ATPase, haloacid dehalogenase domain / P-type ATPase, phosphorylation site / P-type ATPase, cytoplasmic domain N / E1-E2 ATPases phosphorylation site. / P-type ATPase, A domain superfamily / P-type ATPase / P-type ATPase, transmembrane domain superfamily / haloacid dehalogenase-like hydrolase / HAD superfamily / HAD-like superfamily
Similarity search - Domain/homology
TETRAFLUOROALUMINATE ION / CHOLESTEROL / : / 1,2-DIOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE / Sodium/potassium-transporting ATPase subunit alpha / Potassium-transporting ATPase subunit beta
Similarity search - Component
Biological speciesSus scrofa (pig)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.51 Å
AuthorsAbe, K.
Funding support Japan, 1items
OrganizationGrant numberCountry
Japan Society for the Promotion of Science (JSPS)21H02426 Japan
CitationJournal: J Biol Chem / Year: 2024
Title: Specific protonation of acidic residues confers K selectivity to the gastric proton pump.
Authors: Hridya Valia Madapally / Kazuhiro Abe / Vikas Dubey / Himanshu Khandelia /
Abstract: The gastric proton pump (H,K-ATPase) transports a proton into the stomach lumen for every K ion exchanged in the opposite direction. In the lumen-facing state of the pump (E2), the pump selectively ...The gastric proton pump (H,K-ATPase) transports a proton into the stomach lumen for every K ion exchanged in the opposite direction. In the lumen-facing state of the pump (E2), the pump selectively binds K despite the presence of a 10-fold higher concentration of Na. The molecular basis for the ion selectivity of the pump is unknown. Using molecular dynamics simulations, free energy calculations, and Na and K-dependent ATPase activity assays, we demonstrate that the K selectivity of the pump depends upon the simultaneous protonation of the acidic residues E343 and E795 in the ion-binding site. We also show that when E936 is protonated, the pump becomes Na sensitive. The protonation-mimetic mutant E936Q exhibits weak Na-activated ATPase activity. A 2.5-Å resolution cryo-EM structure of the E936Q mutant in the K-occluded E2-Pi form shows, however, no significant structural difference compared with wildtype except less-than-ideal coordination of K in the mutant. The selectivity toward a specific ion correlates with a more rigid and less fluctuating ion-binding site. Despite being exposed to a pH of 1, the fundamental principle driving the K ion selectivity of H,K-ATPase is similar to that of Na,K-ATPase: the ionization states of the acidic residues in the ion-binding sites determine ion selectivity. Unlike the Na,K-ATPase, however, protonation of an ion-binding glutamate residue (E936) confers Na sensitivity.
History
DepositionSep 7, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Nov 29, 2023Provider: repository / Type: Initial release
Revision 1.1Jan 31, 2024Group: Database references / Category: citation
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Sodium/potassium-transporting ATPase subunit alpha
B: Potassium-transporting ATPase subunit beta
hetero molecules


Theoretical massNumber of molelcules
Total (without water)149,92114
Polymers147,3962
Non-polymers2,52412
Water1086
1


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

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Components

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Protein , 2 types, 2 molecules AB

#1: Protein Sodium/potassium-transporting ATPase subunit alpha


Mass: 114282.594 Da / Num. of mol.: 1 / Mutation: Y799W/E936Q
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Sus scrofa (pig) / Gene: ATP4A / Production host: Homo sapiens (human) / References: UniProt: F1RM59
#2: Protein Potassium-transporting ATPase subunit beta / Gastric H(+)/K(+) ATPase subunit beta / Proton pump beta chain / gp60-90


Mass: 33113.844 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Sus scrofa (pig) / Gene: ATP4B / Production host: Homo sapiens (human) / References: UniProt: P18434

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Sugars , 1 types, 5 molecules

#8: Sugar
ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE / N-Acetylglucosamine


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Non-polymers , 6 types, 13 molecules

#3: Chemical ChemComp-K / POTASSIUM ION


Mass: 39.098 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: K / Feature type: SUBJECT OF INVESTIGATION
#4: Chemical ChemComp-ALF / TETRAFLUOROALUMINATE ION


Mass: 102.975 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: AlF4 / Feature type: SUBJECT OF INVESTIGATION
#5: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg
#6: Chemical ChemComp-CLR / CHOLESTEROL / Cholesterol


Mass: 386.654 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C27H46O
#7: Chemical ChemComp-PCW / 1,2-DIOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE / (Z,Z)-4-HYDROXY-N,N,N-TRIMETHYL-10-OXO-7-[(1-OXO-9-OCTADECENYL)OXY]-3,5,9-TRIOXA-4-PHOSPHAHEPTACOS-18-EN-1-AMINIUM-4-OXIDE


Mass: 787.121 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C44H85NO8P / Comment: DOPC, phospholipid*YM
#9: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 6 / Source method: isolated from a natural source / Formula: H2O

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Details

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: alpha-beta complex of the gastric proton pump / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightValue: 0.135 MDa / Experimental value: YES
Source (natural)Organism: Sus scrofa (pig)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 6.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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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 FIELDBright-field microscopy / Nominal defocus max: 1600 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 64 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.51 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 302608 / Symmetry type: POINT
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 54.08 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.002510146
ELECTRON MICROSCOPYf_angle_d0.535513786
ELECTRON MICROSCOPYf_chiral_restr0.04371572
ELECTRON MICROSCOPYf_plane_restr0.00461761
ELECTRON MICROSCOPYf_dihedral_angle_d6.72121445

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