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Protein Structures and Oligomeric States

Enter a protein name, UniProt accession or PDB ID. Name searches ask you to confirm the protein identity before related structures are queried.

Current Protein Identity：Q13422 New Search
10PDB entries
13Biological assembly
14chain/assembly records
Main Difference Dimensions in This Set
Different construct Different mutation/modification Different assembly state Different ligand/ion Different experimental method Different experimental conditions Different structure-quality metrics

Difference tags compare only the current result set; every original PDB and assembly record remains separate.

Related-Structure Differences

Each row represents one biological assembly in one PDB entry; multiple monomers of the same protein are listed separately.

PDB Entry Assembly / Oligomeric State Construct Mutations and Modifications Ligands, Ions and Non-polymers Experimental Method Experimental Conditions Structure Quality
6H0F Structure of DDB1-CRBN-pomalidomide complex bound to IKZF1(ZF2) Deposited 2018-07-09 Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric（3） Consistent with protein count
Chain C 97–130（34 aa）
Not recorded ZN ZINC ION × 2 Y70 S-Pomalidomide × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；293 K；Protein solution: 350 uM IKZF1-ZF2, 70 uM DDB1/CRBN, 80 uM pomalidomide in 50 mM HEPES pH 7.4, 200 mM NaCl, 0.25 mM TCEP Crystallisation solution: (Morpheus HT condition) 100 mM Morpheus buffer system 1 pH 6.5, 10% (v/v) Morpheus NPS solution, 15% (v/v) ethylene glycol and 9.5% (w/v) poly(ethylene glycol) 5000 monomethyl ether.
Resolution 3.25 Å R-free 0.234
6H0F Structure of DDB1-CRBN-pomalidomide complex bound to IKZF1(ZF2) Deposited 2018-07-09 Assembly 2 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric（3） Consistent with protein count
Chain F 97–130（34 aa）
Not recorded ZN ZINC ION × 2 Y70 S-Pomalidomide × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；293 K；Protein solution: 350 uM IKZF1-ZF2, 70 uM DDB1/CRBN, 80 uM pomalidomide in 50 mM HEPES pH 7.4, 200 mM NaCl, 0.25 mM TCEP Crystallisation solution: (Morpheus HT condition) 100 mM Morpheus buffer system 1 pH 6.5, 10% (v/v) Morpheus NPS solution, 15% (v/v) ethylene glycol and 9.5% (w/v) poly(ethylene glycol) 5000 monomethyl ether.
Resolution 3.25 Å R-free 0.234
6H0F Structure of DDB1-CRBN-pomalidomide complex bound to IKZF1(ZF2) Deposited 2018-07-09 Assembly 3 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric（3） Consistent with protein count
Chain I 97–130（34 aa）
Not recorded ZN ZINC ION × 2 Y70 S-Pomalidomide × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；293 K；Protein solution: 350 uM IKZF1-ZF2, 70 uM DDB1/CRBN, 80 uM pomalidomide in 50 mM HEPES pH 7.4, 200 mM NaCl, 0.25 mM TCEP Crystallisation solution: (Morpheus HT condition) 100 mM Morpheus buffer system 1 pH 6.5, 10% (v/v) Morpheus NPS solution, 15% (v/v) ethylene glycol and 9.5% (w/v) poly(ethylene glycol) 5000 monomethyl ether.
Resolution 3.25 Å R-free 0.234
6H0F Structure of DDB1-CRBN-pomalidomide complex bound to IKZF1(ZF2) Deposited 2018-07-09 Assembly 4 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric（3） Consistent with protein count
Chain L 97–130（34 aa）
Not recorded ZN ZINC ION × 2 Y70 S-Pomalidomide × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；293 K；Protein solution: 350 uM IKZF1-ZF2, 70 uM DDB1/CRBN, 80 uM pomalidomide in 50 mM HEPES pH 7.4, 200 mM NaCl, 0.25 mM TCEP Crystallisation solution: (Morpheus HT condition) 100 mM Morpheus buffer system 1 pH 6.5, 10% (v/v) Morpheus NPS solution, 15% (v/v) ethylene glycol and 9.5% (w/v) poly(ethylene glycol) 5000 monomethyl ether.
Resolution 3.25 Å R-free 0.234
8D7Z Cereblon-DDB1 bound to CC-92480 and Ikaros ZF1-2-3 Deposited 2022-06-07 Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric（3） Consistent with protein count
Chain C 112–196（85 aa）
Not recorded ZN ZINC ION × 2 QFC Mezigdomide × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7；20mM HEPES pH 7.0, 240mM NaCl, 3mM TCEP
cryo-EM vitrification conditions Cryogen ETHANE；Manual plunge in 4 degree C cold room
Resolution 3.10 Å
8D80 Cereblon~DDB1 bound to Iberdomide and Ikaros ZF1-2-3 Deposited 2022-06-07 Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric（3） Consistent with protein count
Chain C 112–196（85 aa）
Not recorded ZN ZINC ION × 2 8W7 (3S)-3-[4-({4-[(morpholin-4-yl)methyl]phenyl}methoxy)-1-oxo-1,3-dihydro-2H-isoindol-2-yl]piperidine-2,6-dione × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7；20mM HEPES pH 7.0, 240mM NaCl, 3mM TCEP
cryo-EM vitrification conditions Cryogen ETHANE；Manual plunge in 4 degree C cold room
Resolution 3.60 Å
8RQC Crystal structure of CRBN-midi in complex with mezigdomide and IKZF1 ZF2 Deposited 2024-01-17 Assembly 1 Protein heterocomplex Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain B 141–174（34 aa）
Chain E 141–174（34 aa）
Not recorded ZN ZINC ION × 4 QFC Mezigdomide × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；0.2 M ammonium sulphate, 25% (w/v) PEG 3350, and 0.1 M HEPES pH 7.5
Resolution 2.15 Å R-free 0.286
8TNP Cryo-EM structure of DDB1dB:CRBN:Pomalidomide:SD40 Deposited 2023-08-02 Assembly 1 Insufficient information Heteromer；Protein × 3 PDB declaration: trimeric（3） Consistent with protein count
Chain C 143–178（36 aa）
Mutation：engineered to enhance binding of cereblon/DDB1 in the presence of IMiD derivatives ZN ZINC ION × 2 Y70 S-Pomalidomide × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7；20 mM HEPES/NaOH pH 7.0, 150 mM NaCl, and 3 mM TCEP. DMSO concentrations were kept below 2% (v/v)
cryo-EM vitrification conditions Cryogen ETHANE；Leica EM-GP plunge freezer with chamber conditions of 10 C and 90% relative humidity. Grids were first pre-incubated with 4 uL of 10 uM CRBN-agnostic IKZF1_140-196_Q146A,G151N for 1 minute and then blotted from behind for 4 s. Immediately, 4 uL of mixture 1 diluted 10-fold--with the dilution buffer during the 1-minute incubation time--was applied to the grids before blotting for 4 s and plunging into liquid ethane at -181 C.
Resolution 3.30 Å
8TNQ Cryo-EM structure of DDB1dB:CRBN:PT-179:SD40, conformation 1 Deposited 2023-08-02 Assembly 1 Insufficient information Heteromer；Protein × 3 PDB declaration: trimeric（3） Consistent with protein count
Chain C 143–178（36 aa）
Mutation：engineered to enhance binding of cereblon/DDB1 in the presence of IMiD derivatives ZN ZINC ION × 2 MIQ 2-[(3S)-2,6-dioxopiperidin-3-yl]-5-(morpholin-4-yl)-1H-isoindole-1,3(2H)-dione × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7；20 mM HEPES/NaOH pH 7.0, 150 mM NaCl, and 3 mM TCEP. DMSO concentrations were kept below 2% (v/v)
cryo-EM vitrification conditions Cryogen ETHANE；Leica EM-GP plunge freezer with chamber conditions of 10 C and 90% relative humidity. Grids were first pre-incubated with 4 uL of 10 uM CRBN-agnostic IKZF1_140-196_Q146A,G151N for 1 minute and then blotted from behind for 4 s. Immediately, 4 uL of mixture 1 diluted 10-fold--with the dilution buffer during the 1-minute incubation time--was applied to the grids before blotting for 4 s and plunging into liquid ethane at -181 C.
Resolution 2.41 Å
8TNR Cryo-EM structure of DDB1dB:CRBN:PT-179:SD40, conformation 2 Deposited 2023-08-02 Assembly 1 Insufficient information Heteromer；Protein × 3 PDB declaration: trimeric（3） Consistent with protein count
Chain C 143–178（36 aa）
Mutation：engineered to enhance binding of cereblon/DDB1 in the presence of IMiD derivatives ZN ZINC ION × 2 MIQ 2-[(3S)-2,6-dioxopiperidin-3-yl]-5-(morpholin-4-yl)-1H-isoindole-1,3(2H)-dione × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7；20 mM HEPES/NaOH pH 7.0, 150 mM NaCl, and 3 mM TCEP. DMSO concentrations were kept below 2% (v/v)
cryo-EM vitrification conditions Cryogen ETHANE；Leica EM-GP plunge freezer with chamber conditions of 10 C and 90% relative humidity. Grids were first pre-incubated with 4 uL of 10 uM CRBN-agnostic IKZF1_140-196_Q146A,G151N for 1 minute and then blotted from behind for 4 s. Immediately, 4 uL of mixture 1 diluted 10-fold--with the dilution buffer during the 1-minute incubation time--was applied to the grids before blotting for 4 s and plunging into liquid ethane at -181 C.
Resolution 2.50 Å
9OUK DDB1-CRBN with Ikaros(ZF2) and DEG-47: composite map and model submission Deposited 2025-05-28 Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric（3） Consistent with protein count
Chain C 140–196（57 aa）
Not recorded ZN ZINC ION × 2 A1CEK N-{2-[(3S)-2,6-dioxopiperidin-3-yl]-1-oxo-2,3-dihydro-1H-isoindol-5-yl}benzamide × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7；10mM HEPES, 240mM NaCl, 3mM TCEP
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.69 Å
9Q2D Cryo-EM structure of ternary complex Ikaros-ZF2:CC-885:CRBN:DDB1 (molecular glue degrader) Deposited 2025-08-15 Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric（3） Consistent with protein count
Chain A 112–196（85 aa）
Not recorded ZN ZINC ION × 2 85C 1-(3-chloro-4-methylphenyl)-3-({2-[(3S)-2,6-dioxopiperidin-3-yl]-1-oxo-2,3-dihydro-1H-isoindol-5-yl}methyl)urea × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7
cryo-EM vitrification conditions Cryogen ETHANE；blot time 4 sec blot force 4
Resolution 2.94 Å
9Y7D Cereblon with Golcadomide and Ikaros ZF1-2-3 Deposited 2025-09-09 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain C 83–196（114 aa）
Not recorded ZN ZINC ION × 2 A1AF4 Golcadomide × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7
cryo-EM vitrification conditions Cryogen NITROGEN
Resolution 3.26 Å

This page presents structural evidence recorded in PDB/mmCIF.“No recorded non-water small molecule” does not prove that the experimental sample was ligand-free; experimental conditions belong to the PDB experiment, while ligands and copy counts are shown for each biological assembly.