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- EMDB-39722: Cryo-EM structure of apo Aspergillus terreus glutamate dehydrogen... -

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Basic information

Entry
Database: EMDB / ID: EMD-39722
TitleCryo-EM structure of apo Aspergillus terreus glutamate dehydrogenase (AtGDH) in the closed conformation (form 1)
Map dataAtGDH closed conformation form 1
Sample
  • Complex: apo form of Aspergillus terreus glutamate dehydrogenase
    • Protein or peptide: Glutamate dehydrogenase
Keywordsglutamate dehydrogenase / allostery / cooperativity / Aspergillus / cryo-EM / domain dynamics / OXIDOREDUCTASE
Function / homology
Function and homology information


glutamate biosynthetic process / glutamate dehydrogenase (NADP+) activity / nucleotide binding / cytosol
Similarity search - Function
: / Glutamate dehydrogenase / NAD(P) binding domain of glutamate dehydrogenase / Leu/Phe/Val dehydrogenases active site / Glu / Leu / Phe / Val dehydrogenases active site. / Glutamate/phenylalanine/leucine/valine dehydrogenase / Glutamate/phenylalanine/leucine/valine dehydrogenase, dimerisation domain / Glu/Leu/Phe/Val dehydrogenase, dimerisation domain / Glutamate/Leucine/Phenylalanine/Valine dehydrogenase / Glutamate/phenylalanine/leucine/valine dehydrogenase, C-terminal ...: / Glutamate dehydrogenase / NAD(P) binding domain of glutamate dehydrogenase / Leu/Phe/Val dehydrogenases active site / Glu / Leu / Phe / Val dehydrogenases active site. / Glutamate/phenylalanine/leucine/valine dehydrogenase / Glutamate/phenylalanine/leucine/valine dehydrogenase, dimerisation domain / Glu/Leu/Phe/Val dehydrogenase, dimerisation domain / Glutamate/Leucine/Phenylalanine/Valine dehydrogenase / Glutamate/phenylalanine/leucine/valine dehydrogenase, C-terminal / Glutamate/Leucine/Phenylalanine/Valine dehydrogenase / Aminoacid dehydrogenase-like, N-terminal domain superfamily / NAD(P)-binding domain superfamily
Similarity search - Domain/homology
Glutamate dehydrogenase
Similarity search - Component
Biological speciesAspergillus terreus (mold)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.15 Å
AuthorsGodsora BKJ / Das P / Bhaumik P
Funding support India, 1 items
OrganizationGrant numberCountry
Science and Engineering Research Board (SERB)CRG/2021/002404 India
CitationJournal: Protein Sci / Year: 2025
Title: Conformational flexibility associated with remote residues regulates the kinetic properties of glutamate dehydrogenase.
Authors: Barsa Kanchan Jyotshna Godsora / Parijat Das / Prasoon Kumar Mishra / Anjali Sairaman / Sandip Kaledhonkar / Narayan S Punekar / Prasenjit Bhaumik /
Abstract: Glutamate dehydrogenase (GDH) is a pivotal metabolic enzyme in all living organisms, and some of the GDHs exhibit substrate-dependent homotropic cooperativity. However, the mode of allosteric ...Glutamate dehydrogenase (GDH) is a pivotal metabolic enzyme in all living organisms, and some of the GDHs exhibit substrate-dependent homotropic cooperativity. However, the mode of allosteric communication during the homotropic effect in GDHs remains poorly understood. In this study, we examined two homologous GDHs, Aspergillus niger GDH (AnGDH) and Aspergillus terreus GDH (AtGDH), with differing substrate utilization kinetics to uncover the factors driving their distinct behavior. We report the crystal structures and first-ever cryo-EM structures of apo- AtGDH and AnGDH that captured arrays of conformational ensembles. A wider mouth opening (~ 21 Å) is observed for the cooperative AnGDH as compared to the non-cooperative AtGDH (~17 Å) in their apo states. A network of interactions related to the substitutions in Domain II influence structural flexibility in these GDHs. Remarkably, we have identified a distant substitution (R246 to S) in Domain II, as a part of this network, which can impact the mouth opening and converts non-cooperative AtGDH into a cooperative enzyme. Our study demonstrates that remote residues can influence structural and kinetic properties in homologous GDHs.
History
DepositionApr 11, 2024-
Header (metadata) releaseMar 5, 2025-
Map releaseMar 5, 2025-
UpdateJun 18, 2025-
Current statusJun 18, 2025Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_39722.png

Downloads & links

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Map

FileDownload / File: emd_39722.map.gz / Format: CCP4 / Size: 83.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationAtGDH closed conformation form 1
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.07 Å/pix.
x 280 pix.
= 299.6 Å		1.07 Å/pix.
x 280 pix.
= 299.6 Å		1.07 Å/pix.
x 280 pix.
= 299.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.07 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.045
Minimum - Maximum-0.22502956 - 0.3631582
Average (Standard dev.)0.0001411739 (±0.009621615)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions280280280
Spacing280280280
CellA=B=C: 299.6 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: AtGDH closed half1 map

Fileemd_39722_half_map_1.map
AnnotationAtGDH closed half1 map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: AtGDH closed half2 map

Fileemd_39722_half_map_2.map
AnnotationAtGDH closed half2 map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : apo form of Aspergillus terreus glutamate dehydrogenase

EntireName: apo form of Aspergillus terreus glutamate dehydrogenase
Components
  • Complex: apo form of Aspergillus terreus glutamate dehydrogenase
    • Protein or peptide: Glutamate dehydrogenase

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Supramolecule #1: apo form of Aspergillus terreus glutamate dehydrogenase

SupramoleculeName: apo form of Aspergillus terreus glutamate dehydrogenase
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Aspergillus terreus (mold)
Molecular weightTheoretical: 300 KDa

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Macromolecule #1: Glutamate dehydrogenase

MacromoleculeName: Glutamate dehydrogenase / type: protein_or_peptide / ID: 1 / Number of copies: 6 / Enantiomer: LEVO
Source (natural)Organism: Aspergillus terreus (mold)
Molecular weightTheoretical: 49.247438 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MSNLPVEPEF EQAYKELAST LENSTLFQKN PEYRKALAVV SVPERVIQFR VVWENDKGEV QVNRGFRVQF NSALGPYKGG LRFHPSVNL SILKFLGFEQ IFKNALTGLN MGGGKGGSDF DPKGKSDSEI RRFCVAFMTE LCRHIGADTD VPAGDIGVTG R EIGYLFGQ ...String:
MSNLPVEPEF EQAYKELAST LENSTLFQKN PEYRKALAVV SVPERVIQFR VVWENDKGEV QVNRGFRVQF NSALGPYKGG LRFHPSVNL SILKFLGFEQ IFKNALTGLN MGGGKGGSDF DPKGKSDSEI RRFCVAFMTE LCRHIGADTD VPAGDIGVTG R EIGYLFGQ YRKLRNSWEG VLTGKGGSWG GSLIRPEATG YGVVYYVEHM IAHATNGAES FAGKRVAISG SGNVAQYAAL KV IELGGRV VSLSDSQGSL IVKDTAKDSF TPAEIDAIAA LKVDRKQIAE LVTDAAFADK FTYLPGQRPW VHVGAVDVAL PSA TQNEVS GEEAQALIAA GCKFIAEGSN MGCTQAAIDA FEAHREANKG AAAIWYAPGK AANAGGVAVS GLEMAQNSAR LSWT AEEVD ARLKDIMKSC FQNGLDTAKE YATPADGILP SLVTGSNIAG FTKVAAAMKD QGDWW

UniProtKB: Glutamate dehydrogenase

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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

Concentration3 mg/mL
BufferpH: 7.5 / Details: 30 mM Phosphate buffer pH 7.5
GridModel: Quantifoil R0.6/1 / Material: GOLD / Mesh: 300 / Pretreatment - Type: GLOW DISCHARGE
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: FEI FALCON III (4k x 4k) / Detector mode: COUNTING / Average electron dose: 25.75 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD / Nominal defocus max: 3.3000000000000003 µm / Nominal defocus min: 2.1 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: NONE
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

7ecs

Final reconstructionNumber classes used: 4 / Applied symmetry - Point group: D3 (2x3 fold dihedral) / Resolution.type: BY AUTHOR / Resolution: 3.15 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 398843
Initial angle assignmentType: NOT APPLICABLE
Final angle assignmentType: NOT APPLICABLE

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