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- PDB-6vyg: Cryo-EM structure of Plasmodium vivax hexokinase (Closed state) -

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Basic information

Entry
Database: PDB / ID: 6vyg
TitleCryo-EM structure of Plasmodium vivax hexokinase (Closed state)
ComponentsPhosphotransferase
KeywordsTRANSFERASE / Hexokinase
Function / homology
Function and homology information


hexokinase activity / Transferases; Transferring phosphorus-containing groups; Phosphotransferases with an alcohol group as acceptor / glucose binding / intracellular glucose homeostasis / glycolytic process / ATP binding
Similarity search - Function
Hexokinase / Hexokinase, binding site / Hexokinase, N-terminal / Hexokinase, C-terminal / Hexokinase / Hexokinase / Hexokinase domain signature. / Hexokinase domain profile. / ATPase, nucleotide binding domain
Similarity search - Domain/homology
Phosphotransferase / Phosphotransferase
Similarity search - Component
Biological speciesPlasmodium vivax (malaria parasite P. vivax)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.5 Å
AuthorsSrivastava, S.S. / Darling, J.E. / Suryadi, J. / Morris, J.C. / Drew, M.E. / Subramaniam, S.
Funding support Canada, 1items
OrganizationGrant numberCountry
Canada Excellence Research Chair Award Canada
CitationJournal: IUCrJ / Year: 2020
Title: and human hexokinases share similar active sites but display distinct quaternary architectures.
Authors: Shanti Swaroop Srivastava / Joseph E Darling / Jimmy Suryadi / James C Morris / Mark E Drew / Sriram Subramaniam /
Abstract: Malaria is a devastating disease caused by a protozoan parasite. It affects over 300 million individuals and results in over 400 000 deaths annually, most of whom are young children under the age ...Malaria is a devastating disease caused by a protozoan parasite. It affects over 300 million individuals and results in over 400 000 deaths annually, most of whom are young children under the age of five. Hexokinase, the first enzyme in glucose metabolism, plays an important role in the infection process and represents a promising target for therapeutic intervention. Here, cryo-EM structures of two conformational states of hexokinase (PvHK) are reported at resolutions of ∼3 Å. It is shown that unlike other known hexokinase structures, PvHK displays a unique tetrameric organization (∼220 kDa) that can exist in either open or closed quaternary conformational states. Despite the resemblance of the active site of PvHK to its mammalian counterparts, this tetrameric organization is distinct from that of human hexokinases, providing a foundation for the structure-guided design of parasite-selective antimalarial drugs.
History
DepositionFeb 26, 2020Deposition site: RCSB / Processing site: RCSB
Revision 1.0May 6, 2020Provider: repository / Type: Initial release

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Structure visualization

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Assembly

Deposited unit
A: Phosphotransferase
B: Phosphotransferase
C: Phosphotransferase
D: Phosphotransferase


Theoretical massNumber of molelcules
Total (without water)227,4064
Polymers227,4064
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area6970 Å2
ΔGint-30 kcal/mol
Surface area74910 Å2

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Components

#1: Protein
Phosphotransferase / / Hexokinase


Mass: 56851.543 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Plasmodium vivax (malaria parasite P. vivax)
Gene: PVC01_110030900, PVP01_1125500, PVT01_110029900 / Production host: Escherichia coli (E. coli) / Strain (production host): Origami 2
References: UniProt: A0A1G4HFC9, UniProt: A5K274*PLUS, Transferases; Transferring phosphorus-containing groups; Phosphotransferases with an alcohol group as acceptor

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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: Plasmodium vivax hexokinase / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Plasmodium vivax (malaria parasite P. vivax)
Source (recombinant)Organism: Escherichia coli (E. coli) / Strain: Origami 2
Buffer solutionpH: 7.5 / Details: 20 mM Tris, pH 7.5, 50 mM NaCl, 1 mM TCEP
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 293 K

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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
Image recordingElectron dose: 60.32 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.16_3549: / Classification: refinement
EM software
IDNameVersionCategory
1RELION3particle selection
12RELION3classification
13RELION33D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 181611
SymmetryPoint symmetry: D2 (2x2 fold dihedral)
3D reconstructionResolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 6623 / Algorithm: FOURIER SPACE / Num. of class averages: 1 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00413892
ELECTRON MICROSCOPYf_angle_d0.60718748
ELECTRON MICROSCOPYf_dihedral_angle_d6.7778340
ELECTRON MICROSCOPYf_chiral_restr0.0442056
ELECTRON MICROSCOPYf_plane_restr0.0032404

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