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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：G1SPK4 New Search
33PDB entries
33Biological assembly
33chain/assembly records
Main Difference Dimensions in This Set
Different construct Different assembly state Different ligand/ion 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
6ZVK The Halastavi arva virus (HalV) intergenic region IRES promotes translation by the simplest possible initiation mechanism Deposited 2020-07-24 Assembly 1 Protein–RNA Heteromer；Protein × 80 PDB declaration: 85-meric（85） Consistent with all polymers
Chain K2 5–202（198 aa）
Not recorded ZN ZINC ION × 6 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.49 Å
7A01 The Halastavi arva virus intergenic region IRES promotes translation by the simplest possible initiation mechanism Deposited 2020-08-05 Assembly 1 Protein–RNA Heteromer；Protein × 80 PDB declaration: 85-meric（85） Consistent with all polymers
Chain K2 5–202（198 aa）
Not recorded ZN ZINC ION × 6 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.60 Å
7NWG Mammalian pre-termination 80S ribosome with Hybrid P/E- and A/P-site tRNA's bound by Blasticidin S. Deposited 2021-03-16 Assembly 1 Protein–RNA Heteromer；Protein × 79 PDB declaration: 86-meric（86） Consistent with all polymers
Chain t3 1–318（318 aa）
Not recorded MG MAGNESIUM ION × 299 BLS BLASTICIDIN S × 1 ZN ZINC ION × 8 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4；50 mM HEPES pH 7.4 100 mM KOAc 5 mM Mg(Oac)2 1mM DTT
cryo-EM vitrification conditions Cryogen ETHANE；30s sample incubation on grid followed by 1.1s blotting time.
Resolution 3.80 Å
7NWH Mammalian pre-termination 80S ribosome with eRF1 and eRF3 bound by Blasticidin S. Deposited 2021-03-16 Assembly 1 Protein–RNA Heteromer；Protein × 79 PDB declaration: 84-meric（84） Consistent with all polymers
Chain s 1–318（318 aa）
Not recorded ZN ZINC ION × 8 MG MAGNESIUM ION × 281 GCP PHOSPHOMETHYLPHOSPHONIC ACID GUANYLATE ESTER × 1 BLS BLASTICIDIN S × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4；50 mM HEPES pH 7.4 100 mM KOAc 5 mM Mg(Oac)2 1mM DTT
cryo-EM vitrification conditions Cryogen ETHANE；30s sample incubation on grid followed by 1.1s blotting time.
Resolution 4.10 Å
7NWI Mammalian pre-termination 80S ribosome with Empty-A site bound by Blasticidin S Deposited 2021-03-16 Assembly 1 Protein–RNA Heteromer；Protein × 78 PDB declaration: 84-meric（84） Consistent with all polymers
Chain s 1–318（318 aa）
Not recorded MG MAGNESIUM ION × 210 ZN ZINC ION × 5 BLS BLASTICIDIN S × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4；50 mM HEPES pH 7.4 100 mM KOAc 5 mM Mg(Oac)2 1mM DTT
cryo-EM vitrification conditions Cryogen ETHANE；30s sample incubation on grid followed by 1.1s blotting time.
Resolution 3.13 Å
7O7Y Rabbit 80S ribosome stalled close to the mutated SARS-CoV-2 slippery site by a pseudoknot (high resolution) Deposited 2021-04-14 Assembly 1 Protein–RNA Heteromer；Protein × 79 PDB declaration: 86-meric（86） Consistent with all polymers
Chain Bs 1–318（318 aa）
Not recorded SPD SPERMIDINE × 30 SPM SPERMINE × 3 MG MAGNESIUM ION × 420 UNX UNKNOWN LIGAND × 330 ZN ZINC ION × 8 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 2.20 Å
7O7Z Rabbit 80S ribosome stalled close to the mutated SARS-CoV-2 slippery site by a pseudoknot (classified for pseudoknot) Deposited 2021-04-14 Assembly 1 Protein–RNA Heteromer；Protein × 79 PDB declaration: 86-meric（86） Consistent with all polymers
Chain Bs 1–318（318 aa）
Not recorded SPD SPERMIDINE × 30 SPM SPERMINE × 3 MG MAGNESIUM ION × 420 UNX UNKNOWN LIGAND × 329 ZN ZINC ION × 8 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 2.40 Å
7O80 Rabbit 80S ribosome in complex with eRF1 and ABCE1 stalled at the STOP codon in the mutated SARS-CoV-2 slippery site Deposited 2021-04-14 Assembly 1 Protein–RNA Heteromer；Protein × 81 PDB declaration: 88-meric（88） Consistent with all polymers
Chain Bs 1–318（318 aa）
Not recorded SPD SPERMIDINE × 1 MG MAGNESIUM ION × 355 UNX UNKNOWN LIGAND × 374 ZN ZINC ION × 8 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 SF4 IRON/SULFUR CLUSTER × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 2.90 Å
7O81 Rabbit 80S ribosome colliding in another ribosome stalled by the SARS-CoV-2 pseudoknot Deposited 2021-04-14 Assembly 1 Protein–RNA Heteromer；Protein × 80 PDB declaration: 87-meric（87） Consistent with all polymers
Chain Bs 1–318（318 aa）
Not recorded MG MAGNESIUM ION × 349 UNX UNKNOWN LIGAND × 266 ZN ZINC ION × 8 SPD SPERMIDINE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.10 Å
7ZJW Rabbit 80S ribosome as it decodes the Sec-UGA codon Deposited 2022-04-12 Assembly 1 Protein–RNA Heteromer；Protein × 79 PDB declaration: 86-meric（86） Consistent with all polymers
Chain Lt 1–318（318 aa）
Not recorded GTP GUANOSINE-5'-TRIPHOSPHATE × 2 SER SERINE × 1 MG MAGNESIUM ION × 225 K POTASSIUM ION × 18 ZN ZINC ION × 9 NA SODIUM ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.6
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.80 Å
8BHF Cryo-EM structure of stalled rabbit 80S ribosomes in complex with human CCR4-NOT and CNOT4 Deposited 2022-10-31 Assembly 1 Protein–RNA Heteromer；Protein × 80 PDB declaration: 86-meric（86） Consistent with all polymers
Chain e1 5–200（196 aa）
Not recorded MG MAGNESIUM ION × 275 ZN ZINC ION × 7 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.10 Å
8BPO Structure of rabbit 80S ribosome translating beta-tubulin in complex with tetratricopeptide protein 5 (TTC5) and S-phase Cyclin A Associated Protein residing in the ER (SCAPER) Deposited 2022-11-17 Assembly 1 Protein–RNA Heteromer；Protein × 48 PDB declaration: 51-meric（51） Consistent with all polymers
Chain q2 1–318（318 aa）
Not recorded MG MAGNESIUM ION × 214 ZN ZINC ION × 5 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.80 Å
8BTK Structure of the TRAP complex with the Sec translocon and a translating ribosome Deposited 2022-11-29 Assembly 1 Insufficient information Heteromer；Protein × 86 PDB declaration: 92-meric（92） Consistent with all polymers
Chain Bs 1–318（318 aa）
Not recorded SPD SPERMIDINE × 30 SPM SPERMINE × 3 MG MAGNESIUM ION × 750 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 AAC ACETYLAMINO-ACETIC ACID × 1 ZN ZINC ION × 8 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE；3.5 uL of sample was incubated on the grid for 60 seconds at 4*C and 100% humidity before being blotted and plunged into liquid ethane/propane mix cooled to liquid nitrogen temperature
Resolution 3.50 Å
8P2K Ternary complex of translating ribosome, NAC and METAP1 Deposited 2023-05-16 Assembly 1 Protein–RNA Heteromer；Protein × 82 PDB declaration: 88-meric（88） Consistent with all polymers
Chain Bs 1–318（318 aa）
Not recorded N ANY 5'-MONOPHOSPHATE NUCLEOTIDE × 73 SPD SPERMIDINE × 30 SPM SPERMINE × 3 MG MAGNESIUM ION × 420 UNX UNKNOWN LIGAND × 312 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 AAC ACETYLAMINO-ACETIC ACID × 1 ZN ZINC ION × 8 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.6
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 2.90 Å
8SCB Terminating ribosome with SRI-41315 Deposited 2023-04-05 Assembly 1 Protein–RNA Heteromer；Protein × 80 PDB declaration: 87-meric（87） Consistent with all polymers
Chain s 1–318（318 aa）
Not recorded MG MAGNESIUM ION × 312 ZN ZINC ION × 8 ZVM (2S,4aS)-2-cyclobutyl-10-methyl-3-phenyl-2,10-dihydropyrimido[4,5-b]quinoline-4,5(3H,4aH)-dione × 1 SF4 IRON/SULFUR CLUSTER × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.50 Å
8VFT Translating 80S rabbit ribosome stalled by emetine with eEF2 Deposited 2023-12-22 Assembly 1 Protein–RNA Heteromer；Protein × 78 PDB declaration: 85-meric（85） Consistent with all polymers
Chain s 1–318（318 aa）
Not recorded MG MAGNESIUM ION × 276 ZN ZINC ION × 8 GDP GUANOSINE-5'-DIPHOSPHATE × 1 34G emetine × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.30 Å
8VVP Codon sampling state obtained from Anisomycin-treated mammalian ribosomes Deposited 2024-01-31 Assembly 1 Protein–RNA Heteromer；Protein × 80 PDB declaration: 88-meric（88） Consistent with all polymers
Chain b 1–318（318 aa）
Not recorded MG MAGNESIUM ION × 260 ZN ZINC ION × 8 5GP GUANOSINE-5'-MONOPHOSPHATE × 1 ANM ANISOMYCIN × 1 SPD SPERMIDINE × 6 SPM SPERMINE × 2 K POTASSIUM ION × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 SER SERINE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；20 mM HEPES-KOH, pH 7.5, 100 mM KCl, 1.5 mM MgCl2, 0.5 mM Spermidine, 0.04 mM Spermine, 1 mM DTT
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.90 Å
8VVQ Codon sampling state of elongation inhibitor-treated mammalian ribosomes obtained from merged datasets Deposited 2024-01-31 Assembly 1 Protein–RNA Heteromer；Protein × 80 PDB declaration: 88-meric（88） Consistent with all polymers
Chain b 1–318（318 aa）
Not recorded MG MAGNESIUM ION × 290 ZN ZINC ION × 8 5GP GUANOSINE-5'-MONOPHOSPHATE × 1 ANM ANISOMYCIN × 1 SPD SPERMIDINE × 1 K POTASSIUM ION × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 SER SERINE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；20 mM HEPES-KOH, pH 7.5, 100 mM KCl, 1.5 mM MgCl2, 0.5 mM Spermidine, 0.04 mM Spermine, 1 mM DTT
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.70 Å
8VVR Post-decoding/Post-hydrolysis state obtained from Anisomycin-treated mammalian ribosomes Deposited 2024-01-31 Assembly 1 Protein–RNA Heteromer；Protein × 80 PDB declaration: 88-meric（88） Consistent with all polymers
Chain b 1–318（318 aa）
Not recorded MG MAGNESIUM ION × 204 ZN ZINC ION × 8 5GP GUANOSINE-5'-MONOPHOSPHATE × 1 ANM ANISOMYCIN × 1 SPD SPERMIDINE × 3 K POTASSIUM ION × 1 SER SERINE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；20 mM HEPES-KOH, pH 7.5, 100 mM KCl, 1.5 mM MgCl2, 0.5 mM Spermidine, 0.04 mM Spermine, 1 mM DTT
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.10 Å
8VVS Post-decoding post-hydrolysis state obtained from merged datasets of elongation inhibitor-treated mammalian ribosomes Deposited 2024-01-31 Assembly 1 Protein–RNA Heteromer；Protein × 80 PDB declaration: 88-meric（88） Consistent with all polymers
Chain b 1–318（318 aa）
Not recorded MG MAGNESIUM ION × 236 ZN ZINC ION × 8 5GP GUANOSINE-5'-MONOPHOSPHATE × 1 ANM ANISOMYCIN × 1 SPD SPERMIDINE × 4 K POTASSIUM ION × 1 SER SERINE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；20 mM HEPES-KOH, pH 7.5, 100 mM KCl, 1.5 mM MgCl2, 0.5 mM Spermidine, 0.04 mM Spermine, 1 mM DTT
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.10 Å
8VVT Mammalian ribosomes bound to Anisomycin in the rotated conformation Deposited 2024-01-31 Assembly 1 Protein–RNA Heteromer；Protein × 80 PDB declaration: 84-meric（84） Consistent with all polymers
Chain QA 1–318（318 aa）
Not recorded MG MAGNESIUM ION × 144 ANM ANISOMYCIN × 1 SPD SPERMIDINE × 1 ZN ZINC ION × 8 GDP GUANOSINE-5'-DIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；20 mM HEPES-KOH, pH 7.5, 100 mM KCl, 1.5 mM MgCl2, 0.5 mM Spermidine, 0.04 mM Spermine, 1 mM DTT
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.90 Å
8VVU Anisomycin-bound mammalian ribosome with partially accommodated A-site tRNA Deposited 2024-01-31 Assembly 1 Protein–RNA Heteromer；Protein × 78 PDB declaration: 86-meric（86） Consistent with all polymers
Chain b 1–318（318 aa）
Not recorded MG MAGNESIUM ION × 102 ZN ZINC ION × 8 ANM ANISOMYCIN × 1 SPD SPERMIDINE × 1 SER SERINE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；20 mM HEPES-KOH, pH 7.5, 100 mM KCl, 1.5 mM MgCl2, 0.5 mM Spermidine, 0.04 mM Spermine, 1 mM DTT
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.80 Å
8VVV Mammalian ribosomes bound to Anisomycin in the nonrotated conformation Deposited 2024-01-31 Assembly 1 Protein–RNA Heteromer；Protein × 79 PDB declaration: 83-meric（83） Consistent with all polymers
Chain s 5–200（196 aa）
Not recorded MG MAGNESIUM ION × 294 ZN ZINC ION × 8 GDP GUANOSINE-5'-DIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5；20 mM HEPES-KOH, pH 7.5, 100 mM KCl, 1.5 mM MgCl2, 0.5 mM Spermidine, 0.04 mM Spermine, 1 mM DTT
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.10 Å
9BDN 80S ribosome with angiogenin and tRNAAla Deposited 2024-04-12 Assembly 1 Protein–RNA Heteromer；Protein × 77 PDB declaration: 85-meric（85） Consistent with all polymers
Chain ALP0 5–200（196 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.10 Å
9BDP 80S ribosome bound with angiogenin and complex of eEF1A and Ala-tRNAAla Deposited 2024-04-12 Assembly 1 Protein–RNA Heteromer；Protein × 78 PDB declaration: 86-meric（86） Consistent with all polymers
Chain ALP0 5–200（196 aa）
Not recorded No recorded non-water small molecule ELECTRON MICROSCOPY
cryo-EM buffer pH 7
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.70 Å
9F1B Mammalian ternary complex of a translating 80S ribosome, NAC and NatA/E Deposited 2024-04-18 Assembly 1 Insufficient information Heteromer；Protein × 83 PDB declaration: 89-meric（89） Consistent with all polymers
Chain Bs 1–318（318 aa）
Not recorded MG MAGNESIUM ION × 420 ZN ZINC ION × 8 UNX UNKNOWN LIGAND × 306 IHP INOSITOL HEXAKISPHOSPHATE × 1 SPD SPERMIDINE × 30 SPM SPERMINE × 3 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.01 Å
9F1C Mammalian quaternary complex of a translating 80S ribosome, NAC, MetAP1 and NatA/E Deposited 2024-04-18 Assembly 1 Insufficient information Heteromer；Protein × 84 PDB declaration: 90-meric（90） Consistent with all polymers
Chain Bs 1–318（318 aa）
Not recorded UNX UNKNOWN LIGAND × 277 MG MAGNESIUM ION × 420 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 SPD SPERMIDINE × 30 SPM SPERMINE × 3 ZN ZINC ION × 8 IHP INOSITOL HEXAKISPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.78 Å
9F1D Mammalian quaternary complex of a translating 80S ribosome, NAC, MetAP1 and NatA/E-HYPK Deposited 2024-04-18 Assembly 1 Protein–RNA Heteromer；Protein × 85 PDB declaration: 91-meric（91） Consistent with all polymers
Chain Bs 1–318（318 aa）
Not recorded UNX UNKNOWN LIGAND × 295 SPD SPERMIDINE × 30 MG MAGNESIUM ION × 420 SPM SPERMINE × 3 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 IHP INOSITOL HEXAKISPHOSPHATE × 1 ZN ZINC ION × 8 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.26 Å
9NDP Structure of stalled ribosome and nascent chain in complex with NMT2 and NAC Deposited 2025-02-18 Assembly 1 Insufficient information Heteromer；Protein × 81 PDB declaration: 87-meric（87） Consistent with all polymers
Chain s 1–318（318 aa）
Not recorded MG MAGNESIUM ION × 296 ZN ZINC ION × 6 COA COENZYME A × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.7
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.82 Å
9Q7Q ABCE1-eRF1-RNC-AMD1C Deposited 2025-08-25 Assembly 1 Protein–RNA Heteromer；Protein × 80 PDB declaration: 86-meric（86） Consistent with all polymers
Chain s 1–318（318 aa）
Not recorded MG MAGNESIUM ION × 291 ZN ZINC ION × 6 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.86 Å
9QQA Ternary complex of translating ribosome, NAC and NMT1 Deposited 2025-03-31 Assembly 1 Protein–RNA Heteromer；Protein × 81 PDB declaration: 86-meric（86） Consistent with all polymers
Chain Bs 1–318（318 aa）
Not recorded MG MAGNESIUM ION × 407 UNX UNKNOWN LIGAND × 187 SPD SPERMIDINE × 30 SPM SPERMINE × 3 ZN ZINC ION × 8 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.6
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 2.80 Å
9QQB Quaternary complex of a translating ribosome, NAC, NMT1, and NatA Deposited 2025-03-31 Assembly 1 Protein–RNA Heteromer；Protein × 84 PDB declaration: 89-meric（89） Consistent with all polymers
Chain Bs 1–318（318 aa）
Not recorded SPD SPERMIDINE × 30 SPM SPERMINE × 3 MG MAGNESIUM ION × 412 UNX UNKNOWN LIGAND × 168 ZN ZINC ION × 8 IHP INOSITOL HEXAKISPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.6
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.43 Å
9RHU Rabbit 80S ribosome in complex with eRF1-AAQ, stalled at the Stop codon in mutated F2A sequence Deposited 2025-06-10 Assembly 1 Protein–RNA Heteromer；Protein × 81 PDB declaration: 88-meric（88） Consistent with all polymers
Chain m2 1–318（318 aa）
Not recorded MG MAGNESIUM ION × 367 ZN ZINC ION × 8 K POTASSIUM ION × 37 SPD SPERMIDINE × 2 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 SF4 IRON/SULFUR CLUSTER × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 2.65 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.