National Institutes of Health/National Center for Complementary and Integrative Health (NIH/NCCIH)
P01CA066996
United States
National Institutes of Health/National Center for Complementary and Integrative Health (NIH/NCCIH)
R01CA262188
United States
National Institutes of Health/National Center for Complementary and Integrative Health (NIH/NCCIH)
R01CA214608
United States
National Institutes of Health/National Center for Complementary and Integrative Health (NIH/NCCIH)
R01CA218278
United States
Citation
Journal: Science / Year: 2026 Title: Degron-independent recruitment of KAT2A expands the target space of CRBN molecular glues. Authors: Samuel Ojeda / Meng Wang / Kheewoong Baek / Wallace Bourgeois / Alba Sommerschield / Hong Yue / Rebecca J Metivier / Panos Karagiannis / Talya S Levitz / Yuan Xiong / Katherine A Donovan / ...Authors: Samuel Ojeda / Meng Wang / Kheewoong Baek / Wallace Bourgeois / Alba Sommerschield / Hong Yue / Rebecca J Metivier / Panos Karagiannis / Talya S Levitz / Yuan Xiong / Katherine A Donovan / Scott A Armstrong / Eric S Fischer / Abstract: Lysine acetyltransferases (KATs) cooperate with oncogenes such as c-Myc, estrogen receptor, and lysine methyltransferase 2A (KMT2A) fusions to sustain malignant programs. Targeting of KAT proteins ...Lysine acetyltransferases (KATs) cooperate with oncogenes such as c-Myc, estrogen receptor, and lysine methyltransferase 2A (KMT2A) fusions to sustain malignant programs. Targeting of KAT proteins has shown clinical efficacy; however, achieving homolog selectivity for most KATs remains a major challenge. By extending cereblon (CRBN)-based molecular glues beyond the canonical degron space, we developed an exquisitely selective degrader of KAT2A. Cryo-electron microscopy revealed that CRBN recruits KAT2A independently of a degron; instead, the molecular glue engages a surface-exposed tyrosine, mimicking antibody-like molecular recognition. Selective KAT2A degradation leads to potent ablation of histone H3 lysine 9 acetylation (H3K9Ac), antiproliferative effects in acute myeloid leukemia cell lines, and in vivo efficacy in a patient-derived xenograft model, establishing KAT2A as a targetable vulnerability to treat a wide range of malignancies. More generally, degron-independent recruitment extends the CRBN-targetable proteome.
Name: DNA damage-binding protein 1 / type: protein_or_peptide / ID: 3 Details: N terminal His tagged DDB1dB,N terminal His tagged DDB1dB Number of copies: 1 / Enantiomer: LEVO
Name: (3S)-3-[4-({6-(3-tert-butyl-2-oxoimidazolidin-1-yl)-1-[(2S)-oxan-2-yl]-1H-imidazo[4,5-c]pyridin-4-yl}amino)-1-oxo-1,3-dihydro-2H-isoindol-2-yl]piperidine-2,6-dione type: ligand / ID: 5 / Number of copies: 1 / Formula: A1C5C
Molecular weight
Theoretical: 600.668 Da
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Experimental details
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Structure determination
Method
cryo EM
Processing
single particle reconstruction
Aggregation state
particle
-
Sample preparation
Buffer
pH: 7.4 Component:
Concentration
Formula
Name
30.0 mM
C8H18N2O4S
HEPES
150.0 mM
NaCl
Sodium chloride
Details: 30 mM HEPES/NaOH pH7.4, 150 mM NaCl.
Grid
Model: Quantifoil R0.6/1 / Material: GOLD / Support film - Material: GOLD / Support film - topology: HOLEY
Vitrification
Cryogen name: ETHANE / Chamber humidity: 90 % / Chamber temperature: 283 K / Instrument: LEICA EM GP Details: Grids were vitrified using a Leica EM GP plunge freezer operated at 90% humidity and 10C. Grids were first pre-incubated with 4uL of 10uM CRBN-agnostic IKZF1_140-196_Q146A,G151N for 1 minute ...Details: Grids were vitrified using a Leica EM GP plunge freezer operated at 90% humidity and 10C. Grids were first pre-incubated with 4uL of 10uM CRBN-agnostic IKZF1_140-196_Q146A,G151N for 1 minute and then back-blotted for 4s. Afterwards, 4uL of mixture was applied to the grids, followed by blotting for 4s and plunging into liquid ethane at -181 C..
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Electron microscopy
Microscope
TFS KRIOS
Details
The grid was imaged at a 30-degree tilt
Image recording
Film or detector model: TFS FALCON 4i (4k x 4k) / Number grids imaged: 1 / Number real images: 9381 / Average electron dose: 55.8 e/Å2 / Details: The grid was imaged at a 30-degree tilt
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
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