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- PDB-9ggn: Cryo-EM structure of KBTBD4 WT-HDAC2 2:2 complex mediated by mole... -

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Basic information

Entry
Database: PDB / ID: 9ggn
TitleCryo-EM structure of KBTBD4 WT-HDAC2 2:2 complex mediated by molecular glue UM171
Components
  • Histone deacetylase 2
  • Isoform 1 of Kelch repeat and BTB domain-containing protein 4
KeywordsLIGASE / E3 ligase / deacetylase / ubiquitylation / transcription / molecular glue / complex
Function / homology
Function and homology information


positive regulation of male mating behavior / protein de-2-hydroxyisobutyrylase activity / negative regulation of peptidyl-lysine acetylation / protein lysine delactylase activity / p75NTR negatively regulates cell cycle via SC1 / epidermal cell differentiation / negative regulation of dendritic spine development / histone decrotonylase activity / fungiform papilla formation / negative regulation of MHC class II biosynthetic process ...positive regulation of male mating behavior / protein de-2-hydroxyisobutyrylase activity / negative regulation of peptidyl-lysine acetylation / protein lysine delactylase activity / p75NTR negatively regulates cell cycle via SC1 / epidermal cell differentiation / negative regulation of dendritic spine development / histone decrotonylase activity / fungiform papilla formation / negative regulation of MHC class II biosynthetic process / : / behavioral response to ethanol / positive regulation of interleukin-1 production / NuRD complex / negative regulation of transcription by competitive promoter binding / regulation of cell fate specification / EGR2 and SOX10-mediated initiation of Schwann cell myelination / negative regulation of stem cell population maintenance / ESC/E(Z) complex / histone H4K16 deacetylase activity, hydrolytic mechanism / histone H4K5 deacetylase activity, hydrolytic mechanism / histone H4K8 deacetylase activity, hydrolytic mechanism / histone H3K4 deacetylase activity, hydrolytic mechanism / histone H3K14 deacetylase activity, hydrolytic mechanism / histone H4K12 deacetylase activity, hydrolytic mechanism / cellular response to dopamine / regulation of stem cell differentiation / histone deacetylase / STAT3 nuclear events downstream of ALK signaling / cardiac muscle hypertrophy / histone H3K9 deacetylase activity, hydrolytic mechanism / tubulin deacetylase activity / protein lysine deacetylase activity / response to caffeine / Hydrolases; Acting on carbon-nitrogen bonds, other than peptide bonds; In linear amides / embryonic digit morphogenesis / histone deacetylase activity / Notch-HLH transcription pathway / positive regulation of stem cell population maintenance / eyelid development in camera-type eye / Sin3-type complex / dendrite development / odontogenesis of dentin-containing tooth / response to amyloid-beta / positive regulation of proteolysis / RNA Polymerase I Transcription Initiation / Regulation of MECP2 expression and activity / histone deacetylase complex / positive regulation of oligodendrocyte differentiation / hair follicle placode formation / positive regulation of collagen biosynthetic process / NF-kappaB binding / response to hyperoxia / FOXO-mediated transcription of oxidative stress, metabolic and neuronal genes / Transcriptional regulation of brown and beige adipocyte differentiation by EBF2 / positive regulation of epithelial to mesenchymal transition / MECP2 regulates neuronal receptors and channels / cellular response to transforming growth factor beta stimulus / cellular response to retinoic acid / Regulation of TP53 Activity through Acetylation / heat shock protein binding / response to amphetamine / SUMOylation of chromatin organization proteins / negative regulation of cell migration / ERCC6 (CSB) and EHMT2 (G9a) positively regulate rRNA expression / Regulation of PTEN gene transcription / Regulation of endogenous retroelements by KRAB-ZFP proteins / Regulation of endogenous retroelements by Piwi-interacting RNAs (piRNAs) / promoter-specific chromatin binding / HDACs deacetylate histones / response to nicotine / negative regulation of transforming growth factor beta receptor signaling pathway / circadian regulation of gene expression / negative regulation of DNA-binding transcription factor activity / response to cocaine / protein modification process / NoRC negatively regulates rRNA expression / NOTCH1 Intracellular Domain Regulates Transcription / cellular response to hydrogen peroxide / Constitutive Signaling by NOTCH1 PEST Domain Mutants / Constitutive Signaling by NOTCH1 HD+PEST Domain Mutants / histone deacetylase binding / heterochromatin formation / positive regulation of tumor necrosis factor production / negative regulation of neuron projection development / Factors involved in megakaryocyte development and platelet production / cellular response to heat / RNA polymerase II-specific DNA-binding transcription factor binding / response to lipopolysaccharide / histone binding / Potential therapeutics for SARS / chromosome, telomeric region / chromatin remodeling / response to xenobiotic stimulus / negative regulation of DNA-templated transcription / positive regulation of cell population proliferation / chromatin binding / negative regulation of apoptotic process / chromatin / positive regulation of DNA-templated transcription
Similarity search - Function
Kelch repeat and BTB domain-containing protein 4 / KBTBD4, BTB/POZ domain / KBTBD4, BACK domain / Kelch repeat type 2 / Kelch motif / Histone deacetylase / BTB-kelch protein / BTB/Kelch-associated / BTB And C-terminal Kelch / BTB And C-terminal Kelch ...Kelch repeat and BTB domain-containing protein 4 / KBTBD4, BTB/POZ domain / KBTBD4, BACK domain / Kelch repeat type 2 / Kelch motif / Histone deacetylase / BTB-kelch protein / BTB/Kelch-associated / BTB And C-terminal Kelch / BTB And C-terminal Kelch / Kelch-type beta propeller / : / Histone deacetylase family / Histone deacetylase domain / Histone deacetylase domain superfamily / Histone deacetylase domain / Ureohydrolase domain superfamily / BTB/POZ domain / BTB domain profile. / Broad-Complex, Tramtrack and Bric a brac / BTB/POZ domain / SKP1/BTB/POZ domain superfamily
Similarity search - Domain/homology
: / Histone deacetylase 2 / Kelch repeat and BTB domain-containing protein 4
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsChen, Z. / Chi, G. / Pike, A.C.W. / Montes, B. / Bullock, A.N.
Funding support United Kingdom, Switzerland, 2items
OrganizationGrant numberCountry
Cancer Research UKDRCNPG-May21/100002 United Kingdom
Innovative Medicines Initiative875510 Switzerland
CitationJournal: Nat Commun / Year: 2025
Title: Structural mimicry of UM171 and neomorphic cancer mutants co-opts E3 ligase KBTBD4 for HDAC1/2 recruitment.
Authors: Zhuoyao Chen / Gamma Chi / Timea Balo / Xiangrong Chen / Beatriz Ralsi Montes / Steven C Clifford / Vincenzo D'Angiolella / Timea Szabo / Arpad Kiss / Tibor Novak / András Herner / András ...Authors: Zhuoyao Chen / Gamma Chi / Timea Balo / Xiangrong Chen / Beatriz Ralsi Montes / Steven C Clifford / Vincenzo D'Angiolella / Timea Szabo / Arpad Kiss / Tibor Novak / András Herner / András Kotschy / Alex N Bullock /
Abstract: Neomorphic mutations and drugs can elicit unanticipated effects that require mechanistic understanding to inform clinical practice. Recurrent indel mutations in the Kelch domain of the KBTBD4 E3 ...Neomorphic mutations and drugs can elicit unanticipated effects that require mechanistic understanding to inform clinical practice. Recurrent indel mutations in the Kelch domain of the KBTBD4 E3 ligase rewire epigenetic programs for stemness in medulloblastoma by recruiting LSD1-CoREST-HDAC1/2 complexes as neo-substrates for ubiquitination and degradation. UM171, an investigational drug for haematopoietic stem cell transplantation, was found to degrade LSD1-CoREST-HDAC1/2 complexes in a wild-type KBTBD4-dependent manner, suggesting a potential common mode of action. Here, we identify that these neomorphic interactions are mediated by the HDAC deacetylase domain. Cryo-EM studies of both wild-type and mutant KBTBD4 capture 2:1 and 2:2 KBTBD4-HDAC2 complexes, as well as a 2:1:1 KBTBD4-HDAC2-CoREST1 complex, at resolutions spanning 2.7 to 3.3 Å. The mutant and drug-induced complexes adopt similar structural assemblies requiring both Kelch domains in the KBTBD4 dimer for each HDAC2 interaction. UM171 is identified as a bona fide molecular glue binding across the ternary interface. Most strikingly, the indel mutation reshapes the same surface of KBTBD4 providing an example of a natural mimic of a molecular glue. Together, the structures provide mechanistic understanding of neomorphic KBTBD4, while structure-activity relationship (SAR) analysis of UM171 reveals analog S234984 as a more potent molecular glue for future studies.
History
DepositionAug 13, 2024Deposition site: PDBE / Processing site: PDBE
Revision 1.0Apr 9, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Isoform 1 of Kelch repeat and BTB domain-containing protein 4
B: Histone deacetylase 2
C: Isoform 1 of Kelch repeat and BTB domain-containing protein 4
D: Histone deacetylase 2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)228,3428
Polymers227,3044
Non-polymers1,0384
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 Isoform 1 of Kelch repeat and BTB domain-containing protein 4 / BTB and kelch domain-containing protein 4


Mass: 58208.742 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: KBTBD4, BKLHD4 / Production host: Homo sapiens (human) / References: UniProt: Q9NVX7
#2: Protein Histone deacetylase 2 / HD2 / Protein deacylase HDAC2


Mass: 55443.156 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: HDAC2 / Production host: Homo sapiens (human)
References: UniProt: Q92769, histone deacetylase, Hydrolases; Acting on carbon-nitrogen bonds, other than peptide bonds; In linear amides
#3: Chemical ChemComp-A1ACV / (1r,4r)-N~1~-[(7P)-2-benzyl-7-(2-methyl-2H-tetrazol-5-yl)-9H-pyrimido[4,5-b]indol-4-yl]cyclohexane-1,4-diamine


Mass: 453.542 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C25H27N9 / Feature type: SUBJECT OF INVESTIGATION
#4: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Zn
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: KBTBD4 WT-HDAC2 2:2 complex mediated by molecular glue UM171
Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human) / Strain: Expi293F
Buffer solutionpH: 7.5
Buffer component
IDConc.NameFormulaBuffer-ID
150 mMHEPESC8H18N2O4S1
2150 mMsodium ChlorideNaCl1
35 mMmagnesium dichlorideMgCl21
45 %glycerolC3H5(OH)31
50.5 mMTCEPC9H15O6P1
SpecimenConc.: 0.4 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277.15 K

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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 magnification: 105000 X / Nominal defocus max: 3200 nm / Nominal defocus min: 1000 nm / C2 aperture diameter: 50 µm
Specimen holderCryogen: NITROGEN
Image recordingElectron dose: 38 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 12732
Image scansWidth: 5760 / Height: 4092

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Processing

EM softwareName: PHENIX / Version: 1.20.1_4487: / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 13588054
SymmetryPoint symmetry: C2 (2 fold cyclic)
3D reconstructionResolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 356933 / Symmetry type: POINT
Atomic model buildingB value: 122.7 / Protocol: FLEXIBLE FIT
Details: Initial local fitting was done using Chimera. Then Coot and Phenix was used for model refinement and validation.
Atomic model building
IDPDB-ID 3D fitting-IDAccession codeInitial refinement model-IDSource nameType
17ZZT

7zzt

17ZZT1PDBexperimental model
21AF-Q9N010-F12AlphaFoldin silico model
RefinementCross valid method: NONE

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