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Crystal structure of CSM3-CSM4 subcomplex in the type III-a CRISPR-CAS interference complex

Analyse Crystal structure of CSM3-CSM4 subcomplex in the type III-a CRISPR-CAS… in the GL1X research workbench: secondary structure, accessibility, pockets, interfaces, conservation, variants, modifications, peptides, crosslinks and neighbours on the 3D structure.

PDB
4QTS
Type
protein
Length
979 residues
Chains
4
Method
x-ray diffraction
Collection
MolNFT v1 / PDB
Contract
0xDE3723766Bc32dcACD03C17BaA400A7B36837Eba
Owner
0x3396CDB397284571d12822B4ae1189a8E22AAAAA
Molecule
CRISPR type III-associated ramp protein CSM4; CRISPR type III-associated ramp protein CSM3
UniProt
Q59062, Q59063
Ligands
ZN
Pockets
10 · best druggability 0.74

Structure

x-ray diffraction · 4 distinct chains · 28% helix, 31% strand (DSSP).

ChainMoleculeTypeResiduesSecondary structureUniProt
ACRISPR type III-associated ramp protein CSM4protein31127% helix, 32% strandQ59062
BCRISPR type III-associated ramp protein CSM4protein30829% helix, 31% strandQ59062
CCRISPR type III-associated ramp protein CSM3protein18628% helix, 31% strandQ59063
DCRISPR type III-associated ramp protein CSM3protein17429% helix, 28% strandQ59063

Ligands and binding sites

  • ZN · Zinc ion · metal · 2 copies · chains C, D

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

Pockets

10 pockets found on a 1 Å grid, 5 with a druggability of 0.5 or more.

PocketVolume (ų)DruggabilityBuriednessLining residuesInside
111500.740.77106empty
23620.640.7947empty
36140.620.7466empty
4600.560.8912empty
5730.540.8621empty

Interfaces

5 interfaces between chains.

  • A–B · 1950 Ų buried · 21 hydrogen bonds · protein-protein
  • B–D · 1042 Ų buried · 12 hydrogen bonds · protein-protein
  • A–C · 1028 Ų buried · 15 hydrogen bonds · protein-protein
  • A–D · 18 Ų buried · 0 hydrogen bonds · protein-protein
  • B–C · 17 Ų buried · 0 hydrogen bonds · protein-protein

Compared structures

  • 4QTS · Crystal structure of Csm3-Csm4 subcomplex in the type III-A CRISPR-Cas interference… · the same entry in another collection · chain D against D, TM-score 1.00
  • Q59063 · AlphaFold monomer V2.0 prediction for CRISPR system cms endoribonuclease CSM3 (Q59063) · a predicted model of the same protein · chain D against A, TM-score 0.96
  • Q59062 · AlphaFold monomer V2.0 prediction for CRISPR system cms protein CSM4 (Q59062) · a predicted model of the same protein · chain B against A, TM-score 0.94

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