7YA8 image
Entry Detail
PDB ID:
7YA8
Keywords:
Title:
The crystal structure of IpaH2.5 LRR domain
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2022-06-27
Release Date:
2023-02-08
Method Details:
Experimental Method:
Resolution:
3.40 Å
R-Value Free:
0.24
R-Value Work:
0.19
R-Value Observed:
0.20
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:RING-type E3 ubiquitin transferase
Chain IDs:A, B
Chain Length:243
Number of Molecules:2
Biological Source:Shigella flexneri 5a
Primary Citation
Structural insight into the recognition of the linear ubiquitin assembly complex by Shigella E3 ligase IpaH1.4/2.5.
J.Biochem. 173 317 326 (2023)
PMID: 36610722 DOI: 10.1093/jb/mvac109

Abstact

Pathogenic bacteria deliver virulence factors called effectors into host cells in order to facilitate infection. The Shigella effector proteins IpaH1.4 and IpaH2.5 are members of the 'novel E3 ligase' (NEL)-type bacterial E3 ligase family. These proteins ubiquitinate the linear ubiquitin assembly complex (LUBAC) to inhibit nuclear factor (NF)-κB activation and, concomitantly, the inflammatory response. However, the molecular mechanisms underlying the interaction and recognition between IpaH1.4 and IpaH2.5 and LUBAC are unclear. Here we present the crystal structures of the substrate-recognition domains of IpaH1.4 and IpaH2.5 at resolutions of 1.4 and 3.4 Å, respectively. The LUBAC-binding site on IpaH1.4 was predicted based on structural comparisons with the structures of other NEL-type E3s. Structural and biochemical data were collected and analysed to determine the specific residues of IpaH1.4 that are involved in interactions with LUBAC and influence NF-κB signaling. The new structural insight presented here demonstrates how bacterial pathogens target innate immune signaling pathways.

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