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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：Q9NP91 New Search
10PDB entries
10Biological assembly
18chain/assembly records
Main Difference Dimensions in This Set
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
7Y75 SIT1-ACE2-BA.2 RBD Deposited 2022-06-21 Assembly 1 Other combination Heteromer；Protein × 6 PDB declaration: hexameric（6） Consistent with protein count
Chain B 1–592（592 aa）
Chain D 1–592（592 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 6 3PH 1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE × 6 ZN ZINC ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.10 Å
7Y76 SIT1-ACE2-BA.5 RBD Deposited 2022-06-21 Assembly 1 Other combination Heteromer；Protein × 6 PDB declaration: hexameric（6） Consistent with protein count
Chain B 1–592（592 aa）
Chain D 1–592（592 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 6 3PH 1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE × 6 ZN ZINC ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.20 Å
8I91 ACE2-SIT1 complex bound with proline Deposited 2023-02-06 Assembly 1 Other combination Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain B 1–592（592 aa）
Chain D 1–592（592 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 ZN ZINC ION × 2 PRO PROLINE × 2 CL CHLORIDE ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.4
cryo-EM vitrification conditions Cryogen ETHANE
Resolution 3.30 Å
8P2W Structure of human SIT1 (focussed map / refinement) Deposited 2023-05-16 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain C 1–592（592 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE；grid blotted for 3sec
Resolution 3.76 Å
8P2X Structure of human SIT1:ACE2 complex (open PD conformation) Deposited 2023-05-16 Assembly 1 Other combination Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–592（592 aa）
Chain D 1–592（592 aa）
Not recorded ZN ZINC ION × 2 NDG 2-acetamido-2-deoxy-alpha-D-glucopyranose × 2 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 8 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE；grid blotted for 3sec
Resolution 3.59 Å
8P2Y Structure of human SIT1:ACE2 complex (closed PD conformation) Deposited 2023-05-16 Assembly 1 Other combination Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–592（592 aa）
Chain D 1–592（592 aa）
Not recorded ZN ZINC ION × 2 NDG 2-acetamido-2-deoxy-alpha-D-glucopyranose × 2 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 12 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE；grid blotted for 3sec
Resolution 3.46 Å
8P2Z Structure of human SIT1 bound to L-pipecolate (focussed map / refinement) Deposited 2023-05-16 Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric（2） Consistent with protein count
Chain C 1–592（592 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 YCP (2S)-piperidine-2-carboxylic acid × 1 CL CHLORIDE ION × 1 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE；grid blotted for 4sec after a 20sec wait time
Resolution 3.50 Å
8P30 Structure of human SIT1:ACE2 complex (open PD conformation) bound to L-pipecolate Deposited 2023-05-16 Assembly 1 Other combination Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–592（592 aa）
Chain D 1–592（592 aa）
Not recorded ZN ZINC ION × 2 NDG 2-acetamido-2-deoxy-alpha-D-glucopyranose × 2 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 12 YCP (2S)-piperidine-2-carboxylic acid × 2 CL CHLORIDE ION × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE；grid blotted for 4sec after a 20sec wait time
Resolution 3.29 Å
8P31 Structure of human SIT1:ACE2 complex (closed PD conformation) bound to L-pipecolate Deposited 2023-05-16 Assembly 1 Other combination Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain C 1–592（592 aa）
Chain D 1–592（592 aa）
Not recorded ZN ZINC ION × 2 NDG 2-acetamido-2-deoxy-alpha-D-glucopyranose × 2 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 12 YCP (2S)-piperidine-2-carboxylic acid × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen ETHANE；grid blotted for 4sec after a 20sec wait time
Resolution 3.24 Å
8WM3 Cryo-EM structure of ACE2-SIT1 complex with tiagabine Deposited 2023-10-02 Assembly 1 Other combination Heteromer；Protein × 4 PDB declaration: tetrameric（4） Consistent with protein count
Chain A 1–592（592 aa）
Chain C 1–592（592 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 4 TGI Tiagabine × 2 ELECTRON MICROSCOPY
cryo-EM buffer pH 7.5
cryo-EM vitrification conditions Cryogen NITROGEN
Resolution 3.34 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.