2KN6

Structure of full-length human ASC (Apoptosis-associated speck-like protein containing a CARD)


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 300 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure and interdomain dynamics of apoptosis-associated speck-like protein containing a CARD (ASC)

de Alba, E.

(2009) J.Biol.Chem. 284: 32932-32941

  • DOI: 10.1074/jbc.M109.024273

  • PubMed Abstract: 
  • The human protein ASC is a key mediator in apoptosis and inflammation. Through its two death domains (pyrin and CARD) ASC interacts with cell death executioners, acts as an essential adapter for inflammasome integrity, and oligomerizes into functiona ...

    The human protein ASC is a key mediator in apoptosis and inflammation. Through its two death domains (pyrin and CARD) ASC interacts with cell death executioners, acts as an essential adapter for inflammasome integrity, and oligomerizes into functional supramolecular assemblies. However, these functions are not understood at the structural-dynamic level. This study reports the solution structure and interdomain dynamics of full-length ASC. The pyrin and CARD domains are structurally independent six-helix bundle motifs connected by a 23-residue linker. The CARD structure reveals two distinctive characteristics; helix 1 is not fragmented as in all other known CARDs, and its electrostatic surface shows a uniform distribution of positive and negative charges, whereas these are commonly separated into two areas in other death domains. The linker adopts residual structure resulting in a back-to-back orientation of the domains, which avoids steric interference of each domain with the binding site of the other. NMR relaxation experiments show that the linker is flexible despite the residual structure. This flexibility could help expand the relative volume occupied by each domain, thus increasing the capture radius for effectors. Based on the ASC structure, a tentative model is proposed to illustrate how ASC oligomerizes via CARD and pyrin homophilic interactions. Moreover, ASC oligomers have been analyzed by atomic force microscopy, showing a predominant species of disk-like particles of approximately 12-nm diameter and approximately 1-nm height. Taken together, these results provide structural insight into the behavior of ASC as an adapter molecule.


    Related Citations: 
    • 1H, 15N and 13C backbone and side chain chemical shifts of human ASC (apoptosis-associated speck-like protein containing a CARD domain)
      de Alba, E.
      (2007) Biomol.Nmr Assign. 1: 135


    Organizational Affiliation

    Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Ramiro de Maeztu 9, Madrid 28040, Spain. dealbae@cib.csic.es




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Apoptosis-associated speck-like protein containing a CARD
A
215Homo 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: SOLUTION NMR
  • Conformers Calculated: 300 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2KN6 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2009-08-16 
  • Released Date: 2009-09-15 
  • Deposition Author(s): De Alba, E.

Revision History 

  • Version 1.0: 2009-09-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2011-11-16
    Type: Database references