Biological Assembly 1  

 3D View: Structure

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 11.26 kDa 
• Atom Count: 792 
• Residue Count: 97 
• Unique protein chains: 1

6E26

NMR solution structure of the CARD9 CARD

• DOI: 10.2210/pdb6E26/pdb
• BMRB: 30492

• Classification: SIGNALING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2018-07-10 Released: 2018-09-26 
• Deposition Author(s): Holliday, M.J., Dueber, E.C., Fairbrother, W.J.

---

Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

Picomolar zinc binding modulates formation of Bcl10-nucleating assemblies of the caspase recruitment domain (CARD) of CARD9.

Holliday, M.J., Ferrao, R., de Leon Boenig, G., Estevez, A., Helgason, E., Rohou, A., Dueber, E.C., Fairbrother, W.J.

(2018) J Biol Chem 293: 16803-16817

• PubMed: 30206119 
• DOI: 10.1074/jbc.RA118.004821
• Primary Citation of Related Structures:  
  6E26, 6E25, 6E28, 6E27


• PubMed Abstract: 
  

The caspase recruitment domain-containing protein 9 (CARD9)-B-cell lymphoma/leukemia 10 (Bcl10) signaling axis is activated in myeloid cells during the innate immune response to a variety of diverse pathogens. This signaling pathway requires a critical caspase recruitment domain (CARD)-CARD interaction between CARD9 and Bcl10 that promotes downstream activation of factors, including NF-κB and the mitogen-activated protein kinase (MAPK) p38. Despite these insights, CARD9 remains structurally uncharacterized, and little mechanistic understanding of its regulation exists. We unexpectedly found here that the CARD in CARD9 binds to Zn ²⁺ with picomolar affinity-a concentration comparable with the levels of readily accessible Zn ²⁺ in the cytosol. NMR solution structures of the CARD9-CARD in the apo and Zn ²⁺ -bound states revealed that Zn ²⁺ has little effect on the ground-state structure of the CARD; yet the stability of the domain increased considerably upon Zn ²⁺ binding, with a concomitant reduction in conformational flexibility. Moreover, Zn ²⁺ binding inhibited polymerization of the CARD9-CARD into helical assemblies. Here, we also present a 20-Å resolution negative-stain EM (NS-EM) structure of these filamentous assemblies and show that they adopt a similar helical symmetry as reported previously for filaments of the Bcl10 CARD. Using both bulk assays and direct NS-EM visualization, we further show that the CARD9-CARD assemblies can directly template and thereby nucleate Bcl10 polymerization, a capacity considered critical to propagation of the CARD9-Bcl10 signaling cascade. Our findings indicate that CARD9 is a potential target of Zn ²⁺ -mediated signaling that affects Bcl10 polymerization in innate immune responses.

---

Organizational Affiliation: 

From the Early Discovery Biochemistry Department and [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Caspase recruitment domain-containing protein 9	A	97	Homo sapiens	Mutation(s): 0  Gene Names: CARD9
Find proteins for Q9H257 (Homo sapiens) Explore Q9H257  Go to UniProtKB:  Q9H257
NIH Common Fund Data Resources
PHAROS:  Q9H257 GTEx:  ENSG00000187796

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 6E26 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2018-07-10 
• Released Date: 2018-09-26 
Deposition Author(s): Holliday, M.J., Dueber, E.C., Fairbrother, W.J.

Revision History 

• Version 1.0: 2018-09-26
  Type: Initial release
  
• Version 1.1: 2018-11-07
  Changes: Data collection, Database references