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- PDB-9yhb: Cryo-EM structure of IDH1 R132H C269S -

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Basic information

Entry
Database: PDB / ID: 9yhb
TitleCryo-EM structure of IDH1 R132H C269S
ComponentsIsocitrate dehydrogenase [NADP] cytoplasmic
KeywordsCYTOSOLIC PROTEIN / Dehydrogenase / cellular metabolism / oxidative decarboxylation
Function / homology
Function and homology information


Abnormal conversion of 2-oxoglutarate to 2-hydroxyglutarate / NADPH regeneration / regulation of phospholipid catabolic process / regulation of phospholipid biosynthetic process / NFE2L2 regulating TCA cycle genes / isocitrate metabolic process / isocitrate dehydrogenase (NADP+) / isocitrate dehydrogenase (NADP+) activity / NADPH regeneration / NADP+ metabolic process ...Abnormal conversion of 2-oxoglutarate to 2-hydroxyglutarate / NADPH regeneration / regulation of phospholipid catabolic process / regulation of phospholipid biosynthetic process / NFE2L2 regulating TCA cycle genes / isocitrate metabolic process / isocitrate dehydrogenase (NADP+) / isocitrate dehydrogenase (NADP+) activity / NADPH regeneration / NADP+ metabolic process / 2-oxoglutarate metabolic process / glyoxylate cycle / response to steroid hormone / female gonad development / peroxisomal matrix / tricarboxylic acid cycle / glutathione metabolic process / Peroxisomal protein import / NAD binding / tertiary granule lumen / peroxisome / NADP binding / response to oxidative stress / secretory granule lumen / ficolin-1-rich granule lumen / cadherin binding / Neutrophil degranulation / magnesium ion binding / protein homodimerization activity / mitochondrion / extracellular exosome / extracellular region / identical protein binding / cytosol / cytoplasm
Similarity search - Function
Isocitrate dehydrogenase NADP-dependent / Isocitrate/isopropylmalate dehydrogenase, conserved site / Isocitrate and isopropylmalate dehydrogenases signature. / Isopropylmalate dehydrogenase-like domain / Isocitrate/isopropylmalate dehydrogenase / Isocitrate/isopropylmalate dehydrogenase
Similarity search - Domain/homology
NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE / Isocitrate dehydrogenase [NADP] cytoplasmic
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.85 Å
AuthorsHu, L. / Seo, H.-S. / Dhe-Paganon, S. / Berezuk, A.M. / Tuttle, K.S. / Zhu, X. / Subramaniam, S. / Wu, X.
Funding support Canada, 1items
OrganizationGrant numberCountry
Canada Excellence Research Chair Award Canada
CitationJournal: Nat Chem Biol / Year: 2026
Title: Autopalmitoylation of IDH1-R132H regulates its neomorphic activity in cancer cells.
Authors: Lu Hu / Jinyu Lin / Liping Sun / Alison M Berezuk / Katharine S Tuttle / Xing Zhu / Hyuk-Soo Seo / Sirano Dhe-Paganon / Pan Li / Yang Sun / Lisheng Ni / Jianan Zhang / Dazhi Tan / Hiroaki ...Authors: Lu Hu / Jinyu Lin / Liping Sun / Alison M Berezuk / Katharine S Tuttle / Xing Zhu / Hyuk-Soo Seo / Sirano Dhe-Paganon / Pan Li / Yang Sun / Lisheng Ni / Jianan Zhang / Dazhi Tan / Hiroaki Wakimoto / Daniel P Cahill / Xiaochen Bai / Xuelian Luo / John M Asara / Sriram Subramaniam / Yibing Shan / Xu Wu /
Abstract: Gain-of-function mutations of isocitrate dehydrogenase 1 (IDH1) lead to oncometabolite (R)-2-hydroxyglutarate production, contributing to the tumorigenesis of multiple human cancers. While fatty acid ...Gain-of-function mutations of isocitrate dehydrogenase 1 (IDH1) lead to oncometabolite (R)-2-hydroxyglutarate production, contributing to the tumorigenesis of multiple human cancers. While fatty acid biosynthesis is critical for IDH1-mutant tumor growth, the underlying mechanisms remain unclear. Here, leveraging chemical probes and chemoproteomic profiling, we identified that oncogenic IDH1-R132H is uniquely autopalmitoylated at C269, which is not observed in wild-type IDH1. This modification responds to fatty acids and regulates R132H enzymatic activity by enhancing substrate and cofactor binding, as well as dimerization. Loss of C269 palmitoylation reverses IDH1-R132H-induced metabolic reprogramming and hypermethylation phenotypes and impairs cell transformation. Interestingly, C269 autopalmitoylation occurs within a hydrophobic pocket, targeted by a clinical IDH1-mutant inhibitor (LY3410738). Our study reveals that autopalmitoylation, conferred by the IDH1 mutation, links fatty acid metabolism to the regulation of IDH1 mutant activity and represents a druggable vulnerability in IDH1-mutant cancers.
History
DepositionSep 30, 2025Deposition site: RCSB / Processing site: RCSB
Revision 1.0Feb 4, 2026Provider: repository / Type: Initial release
Revision 1.0Feb 4, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Feb 4, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Feb 4, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Feb 4, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Feb 4, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Feb 4, 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: Isocitrate dehydrogenase [NADP] cytoplasmic
B: Isocitrate dehydrogenase [NADP] cytoplasmic
hetero molecules


Theoretical massNumber of molelcules
Total (without water)97,1734
Polymers95,6872
Non-polymers1,4872
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Isocitrate dehydrogenase [NADP] cytoplasmic / IDH / IDH1 / Cytosolic NADP-isocitrate dehydrogenase / IDPc / NADP(+)-specific ICDH / ...IDH / IDH1 / Cytosolic NADP-isocitrate dehydrogenase / IDPc / NADP(+)-specific ICDH / Oxalosuccinate decarboxylase


Mass: 47843.332 Da / Num. of mol.: 2 / Mutation: R132H, C269S
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: IDH1, PICD / Production host: Escherichia coli (E. coli)
References: UniProt: O75874, isocitrate dehydrogenase (NADP+)
#2: Chemical ChemComp-NAP / NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE / 2'-MONOPHOSPHOADENOSINE 5'-DIPHOSPHORIBOSE


Mass: 743.405 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C21H28N7O17P3
Has ligand of interestN
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: Human isocitrate dehydrogenase 1 R132H mutant / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
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: TFS 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: 500 nm
Image recordingElectron dose: 40 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARCparticle selection
2PHENIX1.21.2_5419model refinement
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.85 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 306203 / Symmetry type: POINT
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 100.61 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00296548
ELECTRON MICROSCOPYf_angle_d0.44458844
ELECTRON MICROSCOPYf_chiral_restr0.041958
ELECTRON MICROSCOPYf_plane_restr0.00271114
ELECTRON MICROSCOPYf_dihedral_angle_d11.6263982

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