7WR2

Cryatal structure of OspC3 C-terminal ankyrin-repeat domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.54 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.171 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural mechanisms of calmodulin activation of Shigella effector OspC3 to ADP-riboxanate caspase-4/11 and block pyroptosis.

Hou, Y.Zeng, H.Li, Z.Feng, N.Meng, F.Xu, Y.Li, L.Shao, F.Ding, J.

(2023) Nat Struct Mol Biol 

  • DOI: 10.1038/s41594-022-00888-3
  • Primary Citation of Related Structures:  
    7WR0, 7WR1, 7WR2, 7WR3, 7WR4, 7WR5, 7WR6

  • PubMed Abstract: 
  • The caspase-4/11-GSDMD pyroptosis axis recognizes cytosolic lipopolysaccharide for antibacterial defenses. Shigella flexneri employs an OspC3 effector to block pyroptosis by catalyzing NAD + -dependent arginine ADP-riboxanation of caspase-4/11 ...

    The caspase-4/11-GSDMD pyroptosis axis recognizes cytosolic lipopolysaccharide for antibacterial defenses. Shigella flexneri employs an OspC3 effector to block pyroptosis by catalyzing NAD + -dependent arginine ADP-riboxanation of caspase-4/11. Here, we identify Ca 2+ -free calmodulin (CaM) that binds and stimulates OspC3 ADP-riboxanase activity. Crystal structures of OspC3-CaM and OspC3-caspase-4 binary complexes reveal unique CaM binding to an OspC3 N-terminal domain featuring an ADP-ribosyltransferase-like fold and specific recognition of caspase-4 by an OspC3 ankryin repeat domain, respectively. CaM-OspC3-caspase-4 ternary complex structures show that NAD + binding reorganizes the catalytic pocket, in which D231 and D177 activate the substrate arginine for initial ADP-ribosylation and ribosyl 2'-OH in the ADP-ribosylated arginine, respectively, for subsequent deamination. We also determine structures of unmodified and OspC3-ADP-riboxanated caspase-4. Mechanisms derived from this series of structures covering the entire process of OspC3 action are supported by biochemical analyses in vitro and functional validation in S. flexneri-infected mice.


    Organizational Affiliation

    National Institute of Biological Sciences, Beijing, Beijing, China. jding@ibp.ac.cn.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
OspC3A161Shigella flexneriMutation(s): 0 
Gene Names: ospC3SF_p0115
EC: 4.3.99
UniProt
Find proteins for A0A0H2US87 (Shigella flexneri)
Explore A0A0H2US87 
Go to UniProtKB:  A0A0H2US87
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0H2US87
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.54 Å
  • R-Value Free: 0.190 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.171 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.215α = 90
b = 53.943β = 90
c = 59.932γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Chinese Academy of SciencesChina--

Revision History  (Full details and data files)

  • Version 1.0: 2023-01-25
    Type: Initial release
  • Version 1.1: 2023-02-01
    Changes: Database references