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- EMDB-74575: Constituent map A of the bGDH di-hexamer in apo form -

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Basic information

Entry
Database: EMDB / ID: EMD-74575
TitleConstituent map A of the bGDH di-hexamer in apo form
Map dataThe constituent map A of dimer-of-hexameric bovine glutamate dehydrogenase in apo form
Sample
  • Complex: Bovine glutamate dehydrogenase
    • Protein or peptide: Bovine Glutamate dehydrogenase
KeywordsGlutamate dehydrogenase Amino acid metabolism filament allosteric regulation / UNKNOWN FUNCTION
Biological speciesBos taurus (Bovine) (domestic cattle) / Bos taurus (domestic cattle)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.89 Å
AuthorsShan Z / Lyumkis D
Funding support United States, 3 items
OrganizationGrant numberCountry
National Science Foundation (NSF, United States)MCB-1934291 United States
National Science Foundation (NSF, United States)DBI-2018942 United States
National Science Foundation (NSF, United States)MCB 2048095 United States
CitationJournal: bioRxiv / Year: 2026
Title: Structural Mechanism of Filamentation Induced Dampening of GTP Inhibition of Glutamate Dehydrogenase.
Authors: Zelin Shan / Noura I Darwish / Andres Rivero-Gamez / Timothy S Strutzenberg / Dmitry Lyumkis / Nancy C Horton /
Abstract: Glutamate dehydrogenase (GDH) is a highly regulated key enzyme that catalyzes the reversible oxidative deamination of glutamate to -ketoglutarate, positioning it at a critical hub linking amino acid ...Glutamate dehydrogenase (GDH) is a highly regulated key enzyme that catalyzes the reversible oxidative deamination of glutamate to -ketoglutarate, positioning it at a critical hub linking amino acid catabolism to energy production while supplying ammonia for urea synthesis and other nitrogen pathways. Early investigations have shown that bovine GDH (bGDH), which shares 98% sequence identity with its human homolog, assembles into polymeric filaments with altered allosteric responses. Filamentation has only relatively recently been appreciated as a widespread mechanism of enzyme regulation, prompting a reevaluation of these early observations in GDH. Here, we use high-resolution cryogenic electron microscopy (cryo-EM) to show that bGDH hexamers assemble via reciprocal "antenna" interactions that oppose the conformational changes associated with GTP inhibition, revealing how filamentation reshapes GDH allostery and with implications for the treatment of human disease.
History
DepositionDec 19, 2025-
Header (metadata) releaseJul 29, 2026-
Map releaseJul 29, 2026-
UpdateJul 29, 2026-
Current statusJul 29, 2026Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_74575.png

Downloads & links

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Map

FileDownload / File: emd_74575.map.gz / Format: CCP4 / Size: 216 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationThe constituent map A of dimer-of-hexameric bovine glutamate dehydrogenase in apo form
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.09 Å/pix.
x 384 pix.
= 419.827 Å		1.09 Å/pix.
x 384 pix.
= 419.827 Å		1.09 Å/pix.
x 384 pix.
= 419.827 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.0933 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.28
Minimum - Maximum-0.7701352 - 1.4533468
Average (Standard dev.)-0.0000403258 (±0.04194444)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions384384384
Spacing384384384
CellA=B=C: 419.8272 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_74575_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: The half-map B for constituent map A of...

Fileemd_74575_half_map_1.map
AnnotationThe half-map B for constituent map A of dimer-of-hexameric bovine glutamate dehydrogenase in apo form
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: The half-map A for constituent map A of...

Fileemd_74575_half_map_2.map
AnnotationThe half-map A for constituent map A of dimer-of-hexameric bovine glutamate dehydrogenase in apo form
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Bovine glutamate dehydrogenase

EntireName: Bovine glutamate dehydrogenase
Components
  • Complex: Bovine glutamate dehydrogenase
    • Protein or peptide: Bovine Glutamate dehydrogenase

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Supramolecule #1: Bovine glutamate dehydrogenase

SupramoleculeName: Bovine glutamate dehydrogenase / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Bos taurus (Bovine) (domestic cattle)
Molecular weightTheoretical: 780 KDa

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Macromolecule #1: Bovine Glutamate dehydrogenase

MacromoleculeName: Bovine Glutamate dehydrogenase / type: protein_or_peptide / ID: 1 / Enantiomer: LEVO
Source (natural)Organism: Bos taurus (domestic cattle)
SequenceString: MYRYLGEALL LSRAGPAALG SASADSAALL GWARGQPAAA PQPGLVPPAR RHYSEAAADR EDDPNFFKM VEGFFDRGAS IVEDKLVEDL KTRETEEQKR NRVRSILRII KPCNHVLSLS F PIRRDDGS WEVIEGYRAQ HSQHRTPCKG GIRYSTDVSV DEVKALASLM ...String:
MYRYLGEALL LSRAGPAALG SASADSAALL GWARGQPAAA PQPGLVPPAR RHYSEAAADR EDDPNFFKM VEGFFDRGAS IVEDKLVEDL KTRETEEQKR NRVRSILRII KPCNHVLSLS F PIRRDDGS WEVIEGYRAQ HSQHRTPCKG GIRYSTDVSV DEVKALASLM TYKCAVVDVP FG GAKAGVK INPKNYTDNE LEKITRRFTM ELAKKGFIGP GVDVPAPDMS TGEREMSWIA DTY ASTIGH YDINAHACVT GKPISQGGIH GRISATGRGV FHGIENFINE ASYMSILGMT PGFG DKTFV VQGFGNVGLH SMRYLHRFGA KCITVGESDG SIWNPDGIDP KELEDFKLQH GTILG FPKA KIYEGSILEV DCDILIPAAS EKQLTKSNAP RVKAKIIAEG ANGPTTPEAD KIFLER NIM VIPDLYLNAG GVTVSYFEWL NNLNHVSYGR LTFKYERDSN YHLLMSVQES LERKFGK HG GTIPIVPTAE FQDRISGASE KDIVHSGLAY TMERSARQIM RTAMKYNLGL DLRTAAYV N AIEKVFRVYN EAGVTFT

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation statefilament

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Sample preparation

Concentration0.5 mg/mL
BufferpH: 7.5
GridModel: UltrAuFoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: GOLD / Support film - topology: HOLEY
VitrificationCryogen name: ETHANE / Chamber humidity: 90 % / Chamber temperature: 277 K / Instrument: HOMEMADE PLUNGER

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Electron microscopy

MicroscopeTFS KRIOS
SoftwareName: EPU
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average exposure time: 3.0 sec. / Average electron dose: 40.4 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 3.0 µm / Nominal defocus min: 1.0 µm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
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
Details: An atomic bGDH model derived from AlphaFold3 prediction
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.89 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 4.2.1) / Number images used: 79910
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: FLEXIBLE FIT

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