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TitlePicomolar zinc binding modulates formation of Bcl10-nucleating assemblies of the caspase recruitment domain (CARD) of CARD9.
Journal, issue, pagesJ Biol Chem, Vol. 293, Issue 43, Page 16803-16817, Year 2018
Publish dateOct 26, 2018
AuthorsMichael J Holliday / Ryan Ferrao / Gladys de Leon Boenig / Alberto Estevez / Elizabeth Helgason / Alexis Rohou / Erin C Dueber / Wayne J Fairbrother /
PubMed AbstractThe 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 ...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 with picomolar affinity-a concentration comparable with the levels of readily accessible Zn in the cytosol. NMR solution structures of the CARD9-CARD in the apo and Zn-bound states revealed that Zn has little effect on the ground-state structure of the CARD; yet the stability of the domain increased considerably upon Zn binding, with a concomitant reduction in conformational flexibility. Moreover, Zn 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-mediated signaling that affects Bcl10 polymerization in innate immune responses.
External linksJ Biol Chem / PubMed:30206119 / PubMed Central
MethodsEM (helical sym.) / NMR (solution) / X-ray diffraction
Resolution1.36 - 20.0 Å
Structure data

EMDB-8976:
CARD9 CARD helical filament
Method: EM (helical sym.) / Resolution: 20.0 Å

PDB-6e25:
NMR solution structure of the CARD9 CARD bound to zinc
Method: SOLUTION NMR

PDB-6e26:
NMR solution structure of the CARD9 CARD
Method: SOLUTION NMR

PDB-6e27:
The CARD9 CARD domain-swapped dimer with a zinc ion bound to one of the two zinc binding sites
Method: X-RAY DIFFRACTION / Resolution: 1.811 Å

PDB-6e28:
The CARD9 CARD domain-swapped dimer
Method: X-RAY DIFFRACTION / Resolution: 1.36 Å

Chemicals

ChemComp-ZN:
Unknown entry

ChemComp-HOH:
WATER / Water

Source
  • homo sapiens (human)
KeywordsSIGNALING PROTEIN / CARD / innate immunity

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