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- PDB-7toe: Structure of G6PD-WT tetramer with no symmetry imposed -

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Basic information

Entry
Database: PDB / ID: 7toe
TitleStructure of G6PD-WT tetramer with no symmetry imposed
ComponentsGlucose-6-phosphate 1-dehydrogenase
KeywordsOXIDOREDUCTASE / apo protein
Function / homology
Function and homology information


negative regulation of protein glutathionylation / pentose biosynthetic process / ribose phosphate biosynthetic process / positive regulation of calcium ion transmembrane transport via high voltage-gated calcium channel / glucose-6-phosphate dehydrogenase (NADP+) / glucose-6-phosphate dehydrogenase activity / response to iron(III) ion / Pentose phosphate pathway / pentose-phosphate shunt, oxidative branch / NADPH regeneration ...negative regulation of protein glutathionylation / pentose biosynthetic process / ribose phosphate biosynthetic process / positive regulation of calcium ion transmembrane transport via high voltage-gated calcium channel / glucose-6-phosphate dehydrogenase (NADP+) / glucose-6-phosphate dehydrogenase activity / response to iron(III) ion / Pentose phosphate pathway / pentose-phosphate shunt, oxidative branch / NADPH regeneration / negative regulation of cell growth involved in cardiac muscle cell development / glucose 6-phosphate metabolic process / NADP metabolic process / D-glucose binding / pentose-phosphate shunt / NFE2L2 regulates pentose phosphate pathway genes / response to food / cholesterol biosynthetic process / erythrocyte maturation / centriolar satellite / negative regulation of reactive oxygen species metabolic process / regulation of neuron apoptotic process / substantia nigra development / glutathione metabolic process / TP53 Regulates Metabolic Genes / lipid metabolic process / : / cytoplasmic side of plasma membrane / glucose metabolic process / NADP binding / cellular response to oxidative stress / response to ethanol / intracellular membrane-bounded organelle / protein homodimerization activity / extracellular exosome / identical protein binding / membrane / cytosol / cytoplasm
Similarity search - Function
Glucose-6-phosphate dehydrogenase, active site / Glucose-6-phosphate dehydrogenase active site. / Glucose-6-phosphate dehydrogenase / Glucose-6-phosphate dehydrogenase, NAD-binding / Glucose-6-phosphate dehydrogenase, C-terminal / Glucose-6-phosphate dehydrogenase, NAD binding domain / Glucose-6-phosphate dehydrogenase, C-terminal domain / NAD(P)-binding domain superfamily
Similarity search - Domain/homology
Glucose-6-phosphate 1-dehydrogenase
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3 Å
AuthorsWei, X. / Marmorstein, R.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS) United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2022
Title: Allosteric role of a structural NADP molecule in glucose-6-phosphate dehydrogenase activity.
Authors: Xuepeng Wei / Kathryn Kixmoeller / Elana Baltrusaitis / Xiaolu Yang / Ronen Marmorstein /
Abstract: Human glucose-6-phosphate dehydrogenase (G6PD) is the main cellular source of NADPH, and thus plays a key role in maintaining reduced glutathione to protect cells from oxidative stress disorders such ...Human glucose-6-phosphate dehydrogenase (G6PD) is the main cellular source of NADPH, and thus plays a key role in maintaining reduced glutathione to protect cells from oxidative stress disorders such as hemolytic anemia. G6PD is a multimeric enzyme that uses the cofactors β-D-glucose 6-phosphate (G6P) and "catalytic" NADP (NADPc), as well as a "structural" NADP (NADPs) located ∼25 Å from the active site, to generate NADPH. While X-ray crystallographic and biochemical studies have revealed a role for NADPs in maintaining the catalytic activity by stabilizing the multimeric G6PD conformation, other potential roles for NADPs have not been evaluated. Here, we determined the high resolution cryo-electron microscopy structures of human wild-type G6PD in the absence of bound ligands and a catalytic G6PD-D200N mutant bound to NADPc and NADPs in the absence or presence of G6P. A comparison of these structures, together with previously reported structures, reveals that the unliganded human G6PD forms a mixture of dimers and tetramers with similar overall folds, and binding of NADPs induces a structural ordering of a C-terminal extension region and allosterically regulates G6P binding and catalysis. These studies have implications for understanding G6PD deficiencies and for therapy of G6PD-mediated disorders.
History
DepositionJan 24, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Sep 14, 2022Provider: repository / Type: Initial release
Revision 1.1Jun 5, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Glucose-6-phosphate 1-dehydrogenase
B: Glucose-6-phosphate 1-dehydrogenase
C: Glucose-6-phosphate 1-dehydrogenase
D: Glucose-6-phosphate 1-dehydrogenase


Theoretical massNumber of molelcules
Total (without water)241,6154
Polymers241,6154
Non-polymers00
Water00
1


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

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Components

#1: Protein
Glucose-6-phosphate 1-dehydrogenase / G6PD


Mass: 60403.754 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: G6PD / Production host: Escherichia coli (E. coli)
References: UniProt: P11413, glucose-6-phosphate dehydrogenase (NADP+)

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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: G6PD protein / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.11 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.5
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 FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 40 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.19.2_4158: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 139200 / Algorithm: BACK PROJECTION / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00615452
ELECTRON MICROSCOPYf_angle_d0.68120896
ELECTRON MICROSCOPYf_dihedral_angle_d4.7712056
ELECTRON MICROSCOPYf_chiral_restr0.0472240
ELECTRON MICROSCOPYf_plane_restr0.0062732

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