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- EMDB-66660: Cryo-EM Structure of G6PT1 without GlcN6P -

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Basic information

Entry
Database: EMDB / ID: EMD-66660
TitleCryo-EM Structure of G6PT1 without GlcN6P
Map data
Sample
  • Complex: G6PT1
    • Protein or peptide: Glucose-6-phosphate exchanger SLC37A4
KeywordsG6P / TRANSPORT PROTEIN
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
Glucose-6-phosphate exchanger SLC37A4
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.5 Å
AuthorsShuai G / Xia Y / Qian W
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)22477098 China
CitationJournal: Nat Commun / Year: 2025
Title: Structures of human glucose-6-phosphate transporter reveal reciprocal antiport mechanism driving glucose-6-phosphate and inorganic phosphate exchange.
Authors: Qian Wang / Ningjie Guo / Yunxiang Du / Junwu Liu / Wanting Ai / Fengyi Yang / Yuanzai Zhu / Yuanyuan Zhao / Di Wu / Lei Liu / Xia Yao / Shuai Gao /
Abstract: Glucose-6-phosphate transporter 1 (G6PT1) is essential for systemic glucose homeostasis, and its deficiency causes glycogen storage disease type 1b (GSD1b). G6PT1 functions as a sugar- ...Glucose-6-phosphate transporter 1 (G6PT1) is essential for systemic glucose homeostasis, and its deficiency causes glycogen storage disease type 1b (GSD1b). G6PT1 functions as a sugar-phosphate/inorganic phosphate (Pi) antiporter, orchestrating G6P transport into the endoplasmic reticulum lumen driven by a Pi gradient. Despite its physiological significance, the molecular mechanisms underlying substrate recognition and antiport activity remain poorly characterized. Here, we present cryo-electron microscopy structures of human G6PT1 in apo, Pi-bound, and GlcN6P-bound (a G6P analogue) states, all captured in cytosol-open conformations. Combined with molecular docking and functional assays, these structures elucidate the molecular basis for Pi and G6P recognition in G6PT1. Comparative analysis reveals that Pi binding triggers an interdomain salt bridge formation, resulting in a thicker luminal gate and a more compact central cavity for G6P binding. In addition to the monomer, we identify a dimeric assembly of G6PT1. Mutating key residues at the dimer interface impairs transport activity, suggesting a regulatory role for oligomerization. Our findings thus provide a mechanistic framework for understanding G6PT1 working mechanism and its pathological dysregulation in GSD1b.
History
DepositionOct 20, 2025-
Header (metadata) releaseJan 7, 2026-
Map releaseJan 7, 2026-
UpdateJan 7, 2026-
Current statusJan 7, 2026Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_66660.png

Downloads & links

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Map

FileDownload / File: emd_66660.map.gz / Format: CCP4 / Size: 52.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.82 Å/pix.
x 240 pix.
= 197.76 Å		0.82 Å/pix.
x 240 pix.
= 197.76 Å		0.82 Å/pix.
x 240 pix.
= 197.76 Å

Surface

Projections

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.824 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.25
Minimum - Maximum-1.4775178 - 1.883415
Average (Standard dev.)0.00040767813 (±0.034611918)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions240240240
Spacing240240240
CellA=B=C: 197.76 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_66660_half_map_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
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Histogram

Histogram (log scale)

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Half map: #1

Fileemd_66660_half_map_2.map
Projections & Slices
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Histogram (log scale)

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Sample components

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Entire : G6PT1

EntireName: G6PT1
Components
  • Complex: G6PT1
    • Protein or peptide: Glucose-6-phosphate exchanger SLC37A4

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Supramolecule #1: G6PT1

SupramoleculeName: G6PT1 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Glucose-6-phosphate exchanger SLC37A4

MacromoleculeName: Glucose-6-phosphate exchanger SLC37A4 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 46.391809 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MAAQGYGYYR TVIFSAMFGG YSLYYFNRKT FSFVMPSLVE EIPLDKDDLG FITSSQSAAY AISKFVSGVL SDQMSARWLF SSGLLLVGL VNIFFAWSST VPVFAALWFL NGLAQGLGWP PCGKVLRKWF EPSQFGTWWA ILSTSMNLAG GLGPILATIL A QSYSWRST ...String:
MAAQGYGYYR TVIFSAMFGG YSLYYFNRKT FSFVMPSLVE EIPLDKDDLG FITSSQSAAY AISKFVSGVL SDQMSARWLF SSGLLLVGL VNIFFAWSST VPVFAALWFL NGLAQGLGWP PCGKVLRKWF EPSQFGTWWA ILSTSMNLAG GLGPILATIL A QSYSWRST LALSGALCVV VSFLCLLLIH NEPADVGLRN LDPMPSEGKK GSLKEESTLQ ELLLSPYLWV LSTGYLVVFG VK TCCTDWG QFFLIQEKGQ SALVGSSYMS ALEVGGLVGS IAAGYLSDRA MAKAGLSNYG NPRHGLLLFM MAGMTVSMYL FRV TVTSDS PKLWILVLGA VFGFSSYGPI ALFGVIANES APPNLCGTSH AIVGLMANVG GFLAGLPFST IAKHYSWSTA FWVA EVICA ASTAAFFLLR NIRTKMGRVS KKAE

UniProtKB: Glucose-6-phosphate exchanger SLC37A4

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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

BufferpH: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.9000000000000001 µm / Nominal defocus min: 1.2 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 222901
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION

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