5H8O

Crystal structure of an ASC-binding nanobody in complex with the CARD domain of ASC


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.206 Å
  • R-Value Free: 0.356 
  • R-Value Work: 0.300 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A single domain antibody fragment that recognizes the adaptor ASC defines the role of ASC domains in inflammasome assembly.

Schmidt, F.I.Lu, A.Chen, J.W.Ruan, J.Tang, C.Wu, H.Ploegh, H.L.

(2016) J.Exp.Med. 213: 771-790

  • DOI: 10.1084/jem.20151790
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Myeloid cells assemble inflammasomes in response to infection or cell damage; cytosolic sensors activate pro-caspase-1, indirectly for the most part, via the adaptors ASC and NLRC4. This leads to secretion of proinflammatory cytokines and pyroptosis. ...

    Myeloid cells assemble inflammasomes in response to infection or cell damage; cytosolic sensors activate pro-caspase-1, indirectly for the most part, via the adaptors ASC and NLRC4. This leads to secretion of proinflammatory cytokines and pyroptosis. To explore complex formation under physiological conditions, we generated an alpaca single domain antibody, VHHASC, which specifically recognizes the CARD of human ASC via its type II interface. VHHASC not only impairs ASC(CARD) interactions in vitro, but also inhibits inflammasome activation in response to NLRP3, AIM2, and NAIP triggers when expressed in living cells, highlighting a role of ASC in all three types of inflammasomes. VHHASC leaves the Pyrin domain of ASC functional and stabilizes a filamentous intermediate of inflammasome activation. Incorporation of VHHASC-EGFP into these structures allowed the visualization of endogenous ASC(PYD) filaments for the first time. These data revealed that cross-linking of ASC(PYD) filaments via ASC(CARD) mediates the assembly of ASC foci.


    Organizational Affiliation

    Whitehead Institute for Biomedical Research, Cambridge, MA 02142.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
VHH nanobody
A
114N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Apoptosis-associated speck-like protein containing a CARD
B
81Homo sapiensMutation(s): 0 
Gene Names: PYCARD (ASC, CARD5, TMS1)
Find proteins for Q9ULZ3 (Homo sapiens)
Go to Gene View: PYCARD
Go to UniProtKB:  Q9ULZ3
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 4.206 Å
  • R-Value Free: 0.356 
  • R-Value Work: 0.300 
  • Space Group: P 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 53.625α = 90.00
b = 30.996β = 90.00
c = 79.244γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
Aimlessdata scaling
iMOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-04-06
    Type: Initial release
  • Version 1.1: 2016-04-27
    Type: Database references
  • Version 1.2: 2016-05-18
    Type: Derived calculations