A20 inhibits NF-kappaB activation independently of binding to 14-3-3 proteins.
The A20 protein, which belongs to a class of Cys2/Cys2 zinc finger proteins, has been characterized as an inhibitor of NF-kappaB activation. In order to clarify its molecular mechanism of action, the yeast two-hybrid system was used to screen for interacting proteins. We report that different isoforms of 14-3-3 proteins, ... viz. eta and zeta, are able to bind A20, involving the 14-3-3-binding motif RSKSDP located between zinc fingers 3 and 4. However, A20 mutants that no longer associated with 14-3-3 proteins could still fully inhibit NF-kappaB activation induced by tumor necrosis factor, interleukin-1beta or phorbol 12-myristate 13-acetate, thus excluding a crucial role for 14-3-3 interaction in this A20 function.
Mesh Terms:
14-3-3 Proteins, Binding Sites, Cell Line, Humans, Intracellular Signaling Peptides and Proteins, NF-kappa B, Nuclear Proteins, Protein Binding, Proteins, Tyrosine 3-Monooxygenase, Zinc Fingers
14-3-3 Proteins, Binding Sites, Cell Line, Humans, Intracellular Signaling Peptides and Proteins, NF-kappa B, Nuclear Proteins, Protein Binding, Proteins, Tyrosine 3-Monooxygenase, Zinc Fingers
Biochem. Biophys. Res. Commun.
Date: Sep. 18, 1997
PubMed ID: 9299557
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