+
Open data
-
Basic information
Entry | Database: PDB / ID: 8x5n | ||||||
---|---|---|---|---|---|---|---|
Title | Tetramer Gabija with ATP | ||||||
![]() |
| ||||||
![]() | DNA BINDING PROTEIN / Anti-Phage System / IMMUNE SYSTEM | ||||||
Function / homology | ![]() DNA helicase complex / recombinational repair / 3'-5' DNA helicase activity / endonuclease activity / defense response to virus / Hydrolases; Acting on ester bonds / hydrolase activity / DNA binding / ATP binding / metal ion binding / cytosol Similarity search - Function | ||||||
Biological species | ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.8 Å | ||||||
![]() | Li, J. / Wang, Z. / Wang, L. | ||||||
Funding support | ![]()
| ||||||
![]() | ![]() Title: Structures and activation mechanism of the Gabija anti-phage system. Authors: Jing Li / Rui Cheng / Zhiming Wang / Wuliu Yuan / Jun Xiao / Xinyuan Zhao / Xinran Du / Shiyu Xia / Lianrong Wang / Bin Zhu / Longfei Wang / ![]() ![]() Abstract: Prokaryotes have evolved intricate innate immune systems against phage infection. Gabija is a highly widespread prokaryotic defence system that consists of two components, GajA and GajB. GajA ...Prokaryotes have evolved intricate innate immune systems against phage infection. Gabija is a highly widespread prokaryotic defence system that consists of two components, GajA and GajB. GajA functions as a DNA endonuclease that is inactive in the presence of ATP. Here, to explore how the Gabija system is activated for anti-phage defence, we report its cryo-electron microscopy structures in five states, including apo GajA, GajA in complex with DNA, GajA bound by ATP, apo GajA-GajB, and GajA-GajB in complex with ATP and Mg. GajA is a rhombus-shaped tetramer with its ATPase domain clustered at the centre and the topoisomerase-primase (Toprim) domain located peripherally. ATP binding at the ATPase domain stabilizes the insertion region within the ATPase domain, keeping the Toprim domain in a closed state. Upon ATP depletion by phages, the Toprim domain opens to bind and cleave the DNA substrate. GajB, which docks on GajA, is activated by the cleaved DNA, ultimately leading to prokaryotic cell death. Our study presents a mechanistic landscape of Gabija activation. | ||||||
History |
|
-
Structure visualization
Structure viewer | Molecule: ![]() ![]() |
---|
-
Downloads & links
-
Download
PDBx/mmCIF format | ![]() | 693 KB | Display | ![]() |
---|---|---|---|---|
PDB format | ![]() | 450.7 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
---|
-Related structure data
Related structure data | ![]() 38071MC ![]() 8jq9C ![]() 8jqbC ![]() 8jqcC ![]() 8wy4C ![]() 8wy5C ![]() 8x51C ![]() 8x5iC M: map data used to model this data C: citing same article ( |
---|---|
Similar structure data | Similarity search - Function & homology ![]() |
-
Links
-
Assembly
Deposited unit | ![]()
|
---|---|
1 |
|
-
Components
#1: Protein | Mass: 67079.469 Da / Num. of mol.: 4 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() References: UniProt: J8H9C1, Hydrolases; Acting on ester bonds #2: Protein | Mass: 57757.656 Da / Num. of mol.: 4 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() #3: Chemical | ChemComp-ATP / #4: Chemical | ChemComp-MG / Has ligand of interest | Y | |
---|
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
---|---|
EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
-
Sample preparation
Component | Name: GajA tetramer with four GajB(ATP binding state) / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT |
---|---|
Molecular weight | Experimental value: NO |
Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 8 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
-
Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
---|---|
Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 1800 nm / Nominal defocus min: 1600 nm |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
-
Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
3D reconstruction | Resolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 190783 / Symmetry type: POINT | ||||||||||||||||||||||||
Refine LS restraints |
|