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Crystal structure of USP18-ISG15 complex

Analyse Crystal structure of USP18-ISG15 complex in the GL1X research workbench: secondary structure, accessibility, pockets, interfaces, conservation, variants, modifications, peptides, crosslinks and neighbours on the 3D structure.

PDB
5CHV
Type
protein
Length
910 residues
Chains
4
Method
x-ray diffraction
Collection
MolNFT v1 / PDB
Contract
0xDE3723766Bc32dcACD03C17BaA400A7B36837Eba
Owner
0x3396CDB397284571d12822B4ae1189a8E22AAAAA
Molecule
Ubl carboxyl-terminal hydrolase 18; Ubiquitin-like protein ISG15
EC
3.4.19.-
UniProt
Q9WTV6, Q64339
Ligands
AYE, ZN, SO4, CL
Pockets
16 · best druggability 0.79

Structure

x-ray diffraction · 3 distinct chains · 28% helix, 34% strand (DSSP).

ChainMoleculeTypeResiduesSecondary structureUniProt
AUbl carboxyl-terminal hydrolase 18 (EC 3.4.19.-)protein30429% helix, 33% strandQ9WTV6
C, DUbiquitin-like protein ISG15protein15324% helix, 36% strandQ64339
BUbl carboxyl-terminal hydrolase 18 (EC 3.4.19.-)protein30028% helix, 33% strandQ9WTV6

Ligands and binding sites

  • AYE · prop-2-en-1-amine · ligand · 2 copies · chains A, C, B, D
  • ZN · Zinc ion · metal · 2 copies · chains A, B
  • SO4 · Sulfate ion · ion · 2 copies · chains A, B
  • CL · Chloride ion · ion · 2 copies · chains A, B

Binding sites are the residues within 4.5 Å of a ligand's heavy atoms.

Pockets

16 pockets found on a 1 Å grid, 8 with a druggability of 0.5 or more.

PocketVolume (ų)DruggabilityBuriednessLining residuesInside
11440.790.9644empty
26330.700.7863SO4
33320.650.8038empty
43880.610.7739SO4
5610.530.8616empty

Interfaces

3 interfaces between chains.

  • A–C · 2208 Ų buried · 24 hydrogen bonds · protein-protein
  • B–D · 1948 Ų buried · 24 hydrogen bonds · protein-protein
  • A–B · 797 Ų buried · 3 hydrogen bonds · protein-protein

Modifications

Observed in the structure: 4 covalent (covalent ligand).

Compared structures

  • 5CHV · Crystal structure of USP18-ISG15 complex · the same entry in another collection · chain A against A, TM-score 1.00
  • Q9WTV6 · AlphaFold monomer V2.0 prediction for ubl carboxyl-terminal hydrolase 18 (Q9WTV6) · a predicted model of the same protein · chain B against A, TM-score 0.99
  • Q64339 · AlphaFold monomer V2.0 prediction for ubiquitin-like protein ISG15 (Q64339) · a predicted model of the same protein · chain C against A, TM-score 0.82

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