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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：Q16533 New Search
18PDB entries
18Biological assembly
18chain/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
7XUR The cryo-EM structure of human mini-SNAPc in complex with hU6-1 PSE Deposited 2022-05-19 Assembly 1 Protein–DNA Heteromer；Protein × 3 PDB declaration: pentameric（5） Consistent with all polymers
Chain C 1–268（268 aa）
Not recorded ZN ZINC ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.49 Å
7ZWC Structure of SNAPc:TBP-TFIIA-TFIIB sub-complex bound to U5 snRNA promoter Deposited 2022-05-19 Assembly 1 Protein–DNA Heteromer；Protein × 8 PDB declaration: decameric（10） Consistent with all polymers
Chain a 1–368（368 aa）
Not recorded ZN ZINC ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.20 Å
7ZWD Structure of SNAPc containing Pol II pre-initiation complex bound to U5 snRNA promoter (CC) Deposited 2022-05-19 Assembly 1 Protein–DNA Heteromer；Protein × 22 PDB declaration: 24-meric（24） Consistent with all polymers
Chain a 1–368（368 aa）
Not recorded ZN ZINC ION × 11 MG MAGNESIUM ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.00 Å
7ZX7 Structure of SNAPc containing Pol II pre-initiation complex bound to U1 snRNA promoter (CC) Deposited 2022-05-20 Assembly 1 Protein–DNA Heteromer；Protein × 22 PDB declaration: 24-meric（24） Consistent with all polymers
Chain a 1–368（368 aa）
Not recorded ZN ZINC ION × 11 MG MAGNESIUM ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.40 Å
7ZX8 Structure of SNAPc containing Pol II pre-initiation complex bound to U1 snRNA promoter (OC) Deposited 2022-05-20 Assembly 1 Protein–DNA Heteromer；Protein × 22 PDB declaration: 24-meric（24） Consistent with all polymers
Chain a 1–368（368 aa）
Not recorded ZN ZINC ION × 11 MG MAGNESIUM ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.00 Å
7ZXE Structure of SNAPc containing Pol II pre-initiation complex bound to U1 snRNA promoter (OC) Deposited 2022-05-20 Assembly 1 Protein–DNA Heteromer；Protein × 8 PDB declaration: decameric（10） Consistent with all polymers
Chain a 1–368（368 aa）
Not recorded ZN ZINC ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.50 Å
8ITY human RNA polymerase III pre-initiation complex closed DNA 1 Deposited 2023-03-23 Assembly 1 Protein–DNA Heteromer；Protein × 23 PDB declaration: 25-meric（25） Consistent with all polymers
Chain 1 1–368（368 aa）
Not recorded ZN ZINC ION × 7 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.90 Å
8IUE RNA polymerase III pre-initiation complex melting complex 1 Deposited 2023-03-24 Assembly 1 Protein–DNA Heteromer；Protein × 23 PDB declaration: 25-meric（25） Consistent with all polymers
Chain 1 1–368（368 aa）
Not recorded ZN ZINC ION × 8 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 4.10 Å
8IUH RNA polymerase III pre-initiation complex open complex 1 Deposited 2023-03-24 Assembly 1 Protein–DNA Heteromer；Protein × 23 PDB declaration: 25-meric（25） Consistent with all polymers
Chain 1 1–368（368 aa）
Not recorded ZN ZINC ION × 8 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.40 Å
9FSO Human RNA Polymerase III Class III Open Pre-initiation Complex 1 (OC1) Deposited 2024-06-21 Assembly 1 Protein–DNA Heteromer；Protein × 23 PDB declaration: 25-meric（25） Consistent with all polymers
Chain U 1–368（368 aa）
Not recorded ZN ZINC ION × 9 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.28 Å
9FSP RNA Polymerase III Class III Open Pre-initation Complex 2 (OC2) Deposited 2024-06-21 Assembly 1 Protein–DNA Heteromer；Protein × 23 PDB declaration: 25-meric（25） Consistent with all polymers
Chain U 1–368（368 aa）
Not recorded ZN ZINC ION × 9 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.39 Å
9FSQ RNA Polymerase III Class III Melting Pre-Initiation Complex (MC) Deposited 2024-06-21 Assembly 1 Protein–DNA Heteromer；Protein × 23 PDB declaration: 25-meric（25） Consistent with all polymers
Chain U 1–368（368 aa）
Not recorded ZN ZINC ION × 9 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.51 Å
9FSR RNA Polymerase III Class III Open Mini Pre-initiation Complex 1 (OC1-mini) Deposited 2024-06-21 Assembly 1 Protein–DNA Heteromer；Protein × 23 PDB declaration: 25-meric（25） Consistent with all polymers
Chain U 1–368（368 aa）
Not recorded ZN ZINC ION × 9 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.76 Å
9FSS RNA Polymerase III Class III Open Mini Pre-Initiation complex 2 (OC2-mini) Deposited 2024-06-21 Assembly 1 Protein–DNA Heteromer；Protein × 23 PDB declaration: 25-meric（25） Consistent with all polymers
Chain U 1–368（368 aa）
Not recorded ZN ZINC ION × 9 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 4.14 Å
9K3B Human RNA Polymerase III de novo transcribing complex 10 overall (TC10-overall) Deposited 2024-10-18 Assembly 1 Other combination Heteromer；Protein × 23 PDB declaration: 26-meric（26） Consistent with all polymers
Chain 1 1–368（368 aa）
Not recorded ZN ZINC ION × 6 MG MAGNESIUM ION × 1 3AT 3'-DEOXYADENOSINE-5'-TRIPHOSPHATE × 1 SF4 IRON/SULFUR CLUSTER × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 4.80 Å
9K3U Human RNA Polymerase III de novo transcribing complex 5 (TC5) Deposited 2024-10-20 Assembly 1 Other combination Heteromer；Protein × 23 PDB declaration: 26-meric（26） Consistent with all polymers
Chain 1 1–368（368 aa）
Not recorded ZN ZINC ION × 7 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.00 Å
9K3V Human RNA Polymerase III de novo transcribing complex 4 (TC4) Deposited 2024-10-20 Assembly 1 Other combination Heteromer；Protein × 23 PDB declaration: 26-meric（26） Consistent with all polymers
Chain 1 1–368（368 aa）
Not recorded ZN ZINC ION × 7 3AT 3'-DEOXYADENOSINE-5'-TRIPHOSPHATE × 1 SF4 IRON/SULFUR CLUSTER × 1 MG MAGNESIUM ION × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.50 Å
9LXN Human RNA Polymerase III de novo transcribing complex 5 (TC5)(without 3'dATP) Deposited 2025-02-18 Assembly 1 Other combination Heteromer；Protein × 23 PDB declaration: 26-meric（26） Consistent with all polymers
Chain 1 1–368（368 aa）
Not recorded ZN ZINC ION × 7 MG MAGNESIUM ION × 1 SF4 IRON/SULFUR CLUSTER × 1 GTP GUANOSINE-5'-TRIPHOSPHATE × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 8
cryo-EM vitrification conditions Cryogen ETHANE-PROPANE
Resolution 3.30 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.