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- PDB-21or: Structure of human SLC37A4 bound to G6P -

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Basic information

Entry
Database: PDB / ID: 21or
TitleStructure of human SLC37A4 bound to G6P
ComponentsGlucose-6-phosphate exchanger SLC37A4
KeywordsMEMBRANE PROTEIN / transporter
Function / homology
Function and homology information


glucose-6-phosphate transmembrane transporter activity / Glycogen storage disease type Ib (SLC37A4) / glucose 6-phosphate:phosphate antiporter activity / glucose-6-phosphate transport / Gluconeogenesis / phosphate ion transmembrane transport / gluconeogenesis / glucose metabolic process / glucose homeostasis / endoplasmic reticulum membrane ...glucose-6-phosphate transmembrane transporter activity / Glycogen storage disease type Ib (SLC37A4) / glucose 6-phosphate:phosphate antiporter activity / glucose-6-phosphate transport / Gluconeogenesis / phosphate ion transmembrane transport / gluconeogenesis / glucose metabolic process / glucose homeostasis / endoplasmic reticulum membrane / endoplasmic reticulum / membrane
Similarity search - Function
Glycerate/sugar phosphate transporter, conserved site / : / glpT family of transporters signature. / Sugar phosphate transporter / Major facilitator superfamily / Major Facilitator Superfamily / Major facilitator superfamily domain / Major facilitator superfamily (MFS) profile. / MFS transporter superfamily
Similarity search - Domain/homology
6-O-phosphono-beta-D-glucopyranose / Glucose-6-phosphate exchanger SLC37A4
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.8 Å
AuthorsWei, X. / Li, H.
Funding support China, 1items
OrganizationGrant numberCountry
Ministry of Science and Technology (MoST, China) China
CitationJournal: To Be Published
Title: Structural basis for substrate recognition and inhibition of human glucose 6-phosphate transporter SLC37A4
Authors: Wei, X.
History
DepositionDec 22, 2025Deposition site: PDBJ / Processing site: PDBC
Revision 1.0May 27, 2026Provider: repository / Type: Initial release
Revision 1.0May 27, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0May 27, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0May 27, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0May 27, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0May 27, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Glucose-6-phosphate exchanger SLC37A4
hetero molecules


Theoretical massNumber of molelcules
Total (without water)46,6522
Polymers46,3921
Non-polymers2601
Water00
1


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

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Components

#1: Protein Glucose-6-phosphate exchanger SLC37A4 / Glucose-5-phosphate transporter / Glucose-6-phosphate translocase / Solute carrier family 37 member ...Glucose-5-phosphate transporter / Glucose-6-phosphate translocase / Solute carrier family 37 member 4 / Transformation-related gene 19 protein / TRG-19


Mass: 46391.809 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SLC37A4, G6PT, G6PT1, PRO0685, TRG19 / Production host: Homo sapiens (human) / References: UniProt: O43826
#2: Sugar ChemComp-BG6 / 6-O-phosphono-beta-D-glucopyranose / BETA-D-GLUCOSE-6-PHOSPHATE / 6-O-phosphono-beta-D-glucose / 6-O-phosphono-D-glucose / 6-O-phosphono-glucose


Type: D-saccharide, beta linking / Mass: 260.136 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C6H13O9P / Feature type: SUBJECT OF INVESTIGATION
IdentifierTypeProgram
b-D-Glcp6PO3IUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
Has ligand of interestY
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: SLC37A4 bound to G6P / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 50 kDa/nm / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
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: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1600 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM software
IDNameVersionCategory
1RELION5particle selection
13RELION53D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 115232 / Symmetry type: POINT
Atomic model buildingProtocol: AB INITIO MODEL / Space: REAL
RefinementHighest resolution: 2.8 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0033263
ELECTRON MICROSCOPYf_angle_d0.7524443
ELECTRON MICROSCOPYf_dihedral_angle_d8.911441
ELECTRON MICROSCOPYf_chiral_restr0.039504
ELECTRON MICROSCOPYf_plane_restr0.005543

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