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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：P61201 New Search
29PDB entries
37Biological assembly
37chain/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
4D10 Crystal structure of the COP9 signalosome Deposited 2014-04-30 Assembly 1 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain J 1–443（443 aa）
Not recorded ZN ZINC ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；pH 5.4；CRYSTALS GROWN BY VAPOR DIFFUSION BY MIXING 9.3 MG/ML PROTEIN IN 50 MM HEPES PH 7.4, 200 MM NACL, 2 MM EQUALLY WITH 12% PEG 6000, 100 MM TRISODIUM CITRATE PH 5.4, 0.1 M LI2SO4, 10 MM UREA.
Resolution 3.80 Å R-free 0.228
4D10 Crystal structure of the COP9 signalosome Deposited 2014-04-30 Assembly 2 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded ZN ZINC ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；pH 5.4；CRYSTALS GROWN BY VAPOR DIFFUSION BY MIXING 9.3 MG/ML PROTEIN IN 50 MM HEPES PH 7.4, 200 MM NACL, 2 MM EQUALLY WITH 12% PEG 6000, 100 MM TRISODIUM CITRATE PH 5.4, 0.1 M LI2SO4, 10 MM UREA.
Resolution 3.80 Å R-free 0.228
4D18 Crystal structure of the COP9 signalosome Deposited 2014-05-01 Assembly 1 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded ZN ZINC ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；pH 5.4；CRYSTAL GROWN BY VAPOR DIFFUSION BY MIXING 9.3 MG/ML PROTEIN IN 50 MM HEPES PH 7.4, 200 MM NACL, 2 MM EQUALLY WITH 12% PEG 6000, 100 MM TRISODIUM CITRATE PH 5.4, 0.1 M LI2SO4. CRYSTAL DEHYDRATED OVERNIGHT WITH 20% PEG 6000 IN WELL
Resolution 4.08 Å R-free 0.253
4D18 Crystal structure of the COP9 signalosome Deposited 2014-05-01 Assembly 2 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain J 1–443（443 aa）
Not recorded ZN ZINC ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION；pH 5.4；CRYSTAL GROWN BY VAPOR DIFFUSION BY MIXING 9.3 MG/ML PROTEIN IN 50 MM HEPES PH 7.4, 200 MM NACL, 2 MM EQUALLY WITH 12% PEG 6000, 100 MM TRISODIUM CITRATE PH 5.4, 0.1 M LI2SO4. CRYSTAL DEHYDRATED OVERNIGHT WITH 20% PEG 6000 IN WELL
Resolution 4.08 Å R-free 0.253
4WSN Crystal structure of the COP9 signalosome, a P1 crystal form Deposited 2014-10-28 Assembly 1 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded ZN ZINC ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；273 K；CRYSTALS GROWN BY VAPOR DIFFUSION BY MIXING 9.3 MG/ML PROTEIN IN 50 MM HEPES PH 7.4, 200 MM NACL, 2 MM EQUALLY WITH 12% PEG 6000, 100 MM TRISODIUM CITRATE PH 5.4, 0.1 M LI2SO4.
Resolution 5.50 Å R-free 0.282
4WSN Crystal structure of the COP9 signalosome, a P1 crystal form Deposited 2014-10-28 Assembly 2 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain J 1–443（443 aa）
Not recorded ZN ZINC ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；273 K；CRYSTALS GROWN BY VAPOR DIFFUSION BY MIXING 9.3 MG/ML PROTEIN IN 50 MM HEPES PH 7.4, 200 MM NACL, 2 MM EQUALLY WITH 12% PEG 6000, 100 MM TRISODIUM CITRATE PH 5.4, 0.1 M LI2SO4.
Resolution 5.50 Å R-free 0.282
4WSN Crystal structure of the COP9 signalosome, a P1 crystal form Deposited 2014-10-28 Assembly 3 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain R 1–443（443 aa）
Not recorded ZN ZINC ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；273 K；CRYSTALS GROWN BY VAPOR DIFFUSION BY MIXING 9.3 MG/ML PROTEIN IN 50 MM HEPES PH 7.4, 200 MM NACL, 2 MM EQUALLY WITH 12% PEG 6000, 100 MM TRISODIUM CITRATE PH 5.4, 0.1 M LI2SO4.
Resolution 5.50 Å R-free 0.282
4WSN Crystal structure of the COP9 signalosome, a P1 crystal form Deposited 2014-10-28 Assembly 4 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain Z 1–443（443 aa）
Not recorded ZN ZINC ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；273 K；CRYSTALS GROWN BY VAPOR DIFFUSION BY MIXING 9.3 MG/ML PROTEIN IN 50 MM HEPES PH 7.4, 200 MM NACL, 2 MM EQUALLY WITH 12% PEG 6000, 100 MM TRISODIUM CITRATE PH 5.4, 0.1 M LI2SO4.
Resolution 5.50 Å R-free 0.282
4WSN Crystal structure of the COP9 signalosome, a P1 crystal form Deposited 2014-10-28 Assembly 5 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain h 1–443（443 aa）
Not recorded ZN ZINC ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；273 K；CRYSTALS GROWN BY VAPOR DIFFUSION BY MIXING 9.3 MG/ML PROTEIN IN 50 MM HEPES PH 7.4, 200 MM NACL, 2 MM EQUALLY WITH 12% PEG 6000, 100 MM TRISODIUM CITRATE PH 5.4, 0.1 M LI2SO4.
Resolution 5.50 Å R-free 0.282
4WSN Crystal structure of the COP9 signalosome, a P1 crystal form Deposited 2014-10-28 Assembly 6 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain p 1–443（443 aa）
Not recorded ZN ZINC ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；273 K；CRYSTALS GROWN BY VAPOR DIFFUSION BY MIXING 9.3 MG/ML PROTEIN IN 50 MM HEPES PH 7.4, 200 MM NACL, 2 MM EQUALLY WITH 12% PEG 6000, 100 MM TRISODIUM CITRATE PH 5.4, 0.1 M LI2SO4.
Resolution 5.50 Å R-free 0.282
6A73 Complex structure of CSN2 with IP6 Deposited 2018-07-02 Assembly 1 Insufficient information Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain A 29–162（134 aa）
Mutation：C54T, C97A IHP INOSITOL HEXAKISPHOSPHATE × 1 SO4 SULFATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.2 M ammonium sulfate ,100mM Bis-Tris pH 5.5, 25%PEG 3350.
Resolution 2.45 Å R-free 0.288
6A73 Complex structure of CSN2 with IP6 Deposited 2018-07-02 Assembly 2 Insufficient information Monomer；Protein × 1 PDB declaration: monomeric（1） Consistent with protein count
Chain B 29–162（134 aa）
Mutation：C54T, C97A IHP INOSITOL HEXAKISPHOSPHATE × 1 SO4 SULFATE ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.2 M ammonium sulfate ,100mM Bis-Tris pH 5.5, 25%PEG 3350.
Resolution 2.45 Å R-free 0.288
6R6H Structural basis of Cullin-2 RING E3 ligase regulation by the COP9 signalosome Deposited 2019-03-27 Assembly 1 Protein heterocomplex Heteromer；Protein × 13 PDB declaration: tridecameric（13） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded ZN ZINC ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；15 mM Hepes pH 7.5 100 mM NaCl 0.5 mM DTT 1% glycerol
cryo-EM vitrification conditions Cryogen NITROGEN
Resolution 8.40 Å
6R7F Structural basis of Cullin-2 RING E3 ligase regulation by the COP9 signalosome Deposited 2019-03-28 Assembly 1 Protein heterocomplex Heteromer；Protein × 14 PDB declaration: tetradecameric（14） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；15 mM HEPES pH 7.5 100 mM NaCL 0.5 mM DTT 1% Glycerol
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 8.20 Å
6R7H Structural basis of Cullin-2 RING E3 ligase regulation by the COP9 signalosome Deposited 2019-03-28 Assembly 1 Protein heterocomplex Heteromer；Protein × 12 PDB declaration: dodecameric（12） Consistent with protein count
Chain B 30–443（414 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；15 mM HEPES pH 7.5 100 mM NaCl 0.5 mM DTT 1% Glycerol
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 8.80 Å
6R7I Structural basis of Cullin-2 RING E3 ligase regulation by the COP9 signalosome Deposited 2019-03-28 Assembly 1 Protein heterocomplex Heteromer；Protein × 13 PDB declaration: tridecameric（13） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded ZN ZINC ION × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 5.90 Å
6R7N Structural basis of Cullin-2 RING E3 ligase regulation by the COP9 signalosome Deposited 2019-03-29 Assembly 1 Protein heterocomplex Heteromer；Protein × 10 PDB declaration: decameric（10） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded ZN ZINC ION × 3 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；15 mM HEPES pH 7.5 100 mM NaCl 0.5 mM DTT 1% Glycerol
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 6.50 Å
8H38 Cryo-EM Structure of the KBTBD2-CRL3~N8-CSN(mutate) complex Deposited 2022-10-08 Assembly 1 Protein heterocomplex Heteromer；Protein × 13 PDB declaration: tridecameric（13） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded ZN ZINC ION × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.8
Resolution 4.25 Å
8H3A Cryo-EM Structure of the KBTBD2-CRL3~N8(removed)-CSN complex Deposited 2022-10-08 Assembly 1 Protein heterocomplex Heteromer；Protein × 12 PDB declaration: dodecameric（12） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded ZN ZINC ION × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 7.51 Å
8H3F Cryo-EM Structure of the KBTBD2-CRL3-CSN complex Deposited 2022-10-08 Assembly 1 Protein heterocomplex Heteromer；Protein × 12 PDB declaration: dodecameric（12） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded ZN ZINC ION × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 6.73 Å
9E5Z Cryo-EM structure of COP9 signalosome Deposited 2024-10-28 Assembly 1 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded ZN ZINC ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.40 Å
9E77 Cryo-EM structure of CSN-N8 in complex with CSN5i-3 Deposited 2024-11-01 Assembly 1 Protein heterocomplex Heteromer；Protein × 9 PDB declaration: nonameric（9） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded 6LT 3-(difluoromethyl)-N-{6-[(5S,6S)-6-hydroxy-6,7,8,9-tetrahydro-5H-imidazo[1,5-a]azepin-5-yl][1,1'-biphenyl]-3-yl}-1-(propan-2-yl)-1H-pyrazole-5-carboxamide × 1 ZN ZINC ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.30 Å
9E81 Cryo-EM structure of COP9 signalosome in complex with CSN5i-3 Deposited 2024-11-04 Assembly 1 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded 6LT 3-(difluoromethyl)-N-{6-[(5S,6S)-6-hydroxy-6,7,8,9-tetrahydro-5H-imidazo[1,5-a]azepin-5-yl][1,1'-biphenyl]-3-yl}-1-(propan-2-yl)-1H-pyrazole-5-carboxamide × 1 ZN ZINC ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.30 Å
9EFM Cryo-EM structure of COP9 signalosome precatalytic state with neddylated cullin-1 Deposited 2024-11-20 Assembly 1 Protein heterocomplex Heteromer；Protein × 11 PDB declaration: undecameric（11） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded ZN ZINC ION × 3 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.16 Å
9EFQ Cryo-EM structure of COP9 signalosome precatalytic state with neddylated cullin-2 Deposited 2024-11-20 Assembly 1 Protein heterocomplex Heteromer；Protein × 11 PDB declaration: undecameric（11） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded ZN ZINC ION × 3 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.96 Å
9EFV Cryo-EM structure of CSN-N8CUL1 in complex with CSN5i-3 Deposited 2024-11-20 Assembly 1 Protein heterocomplex Heteromer；Protein × 11 PDB declaration: undecameric（11） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded 6LT 3-(difluoromethyl)-N-{6-[(5S,6S)-6-hydroxy-6,7,8,9-tetrahydro-5H-imidazo[1,5-a]azepin-5-yl][1,1'-biphenyl]-3-yl}-1-(propan-2-yl)-1H-pyrazole-5-carboxamide × 1 ZN ZINC ION × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.03 Å
9EG1 COP9 signalosome deneddylation complex with cullin-5 Deposited 2024-11-20 Assembly 1 Protein heterocomplex Heteromer；Protein × 11 PDB declaration: undecameric（11） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded ZN ZINC ION × 3 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.52 Å
9EG8 Cryo-EM structure of COP9 signalosome precatalytic state with neddylated cullin-4A Deposited 2024-11-21 Assembly 1 Protein heterocomplex Heteromer；Protein × 11 PDB declaration: undecameric（11） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded ZN ZINC ION × 3 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.39 Å
9EGL Cryo-EM structure of COP9 signalosome precatalytic state with neddylated cullin-3 Deposited 2024-11-21 Assembly 1 Protein heterocomplex Heteromer；Protein × 11 PDB declaration: undecameric（11） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded ZN ZINC ION × 3 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.93 Å
9PH4 Cryo-EM structure of COP9 signalosome in complex with CSN5i-1a Deposited 2025-07-08 Assembly 1 Protein heterocomplex Heteromer；Protein × 8 PDB declaration: octameric（8） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded ZN ZINC ION × 1 A1CH3 6-[(4R,5S,6S)-6-hydroxy-6,7,8,9-tetrahydro-5H-imidazo[1,5-a]azepin-5-yl][1,1'-biphenyl]-3-carbonitrile × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.00 Å
9QO0 Pre-activated 9-subunit COP9 signalosome and neddylated SCF (Skp1-Skp2-Cks1) complex structure Deposited 2025-03-25 Assembly 1 Protein heterocomplex Heteromer；Protein × 15 PDB declaration: 15-meric（15） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded IHP INOSITOL HEXAKISPHOSPHATE × 1 ZN ZINC ION × 3 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；15 mM Hepes pH 7.5, 120 mM NaCl, 0.5 mM DTT
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.26 Å
9QO1 Activated 9-subunit COP9 signalosome and neddylated SCF (SKP1-SKP2-CKS1) complex structure Deposited 2025-03-25 Assembly 1 Protein heterocomplex Heteromer；Protein × 12 PDB declaration: 12-meric（12） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded IHP INOSITOL HEXAKISPHOSPHATE × 1 ZN ZINC ION × 3 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.23 Å
9QO2 Dissociation-state-1 of 9-subunit CSN and SCF (SKP1-SKP2-CKS1) complex Deposited 2025-03-25 Assembly 1 Protein heterocomplex Heteromer；Protein × 14 PDB declaration: 14-meric（14） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded IHP INOSITOL HEXAKISPHOSPHATE × 1 ZN ZINC ION × 3 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；15 mM Hepes pH 7.5, 120 mM NaCl, 0.5 mM DTT
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.80 Å
9QO3 Dissociation-state-2 of 9-subunit CSN and SCF (SKP1-SKP2-CKS1) complex Deposited 2025-03-25 Assembly 1 Protein heterocomplex Heteromer；Protein × 13 PDB declaration: 13-meric（13） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded ZN ZINC ION × 1 IHP INOSITOL HEXAKISPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；15 mM Hepes pH 7.5, 120 mM NaCl, 0.5 mM DTT
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 4.60 Å
9QO4 Dissociation-state-3 of 9-subunit CSN and SCF (SKP1-SKP2-CKS1) complex Deposited 2025-03-25 Assembly 1 Protein heterocomplex Heteromer；Protein × 14 PDB declaration: 14-meric（14） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded IHP INOSITOL HEXAKISPHOSPHATE × 1 ZN ZINC ION × 4 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；15 mM Hepes pH 7.5, 120 mM NaCl, 0.5 mM DTT
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.95 Å
9QO5 Dissociation-state-4 of 9-subunit CSN and SCF (SKP1-SKP2-CKS1) complex Deposited 2025-03-25 Assembly 1 Protein heterocomplex Heteromer；Protein × 14 PDB declaration: 14-meric（14） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded IHP INOSITOL HEXAKISPHOSPHATE × 1 ZN ZINC ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；15 mM Hepes pH 7.5, 120 mM NaCl, 0.5 mM DTT
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 4.00 Å
9QO6 9-subunit COP9 signalosome complex Deposited 2025-03-25 Assembly 1 Protein heterocomplex Heteromer；Protein × 9 PDB declaration: nonameric（9） Consistent with protein count
Chain B 1–443（443 aa）
Not recorded ZN ZINC ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；15 mM Hepes pH 7.5, 120 mM NaCl, 0.5 mM DTT
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.00 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.