De Valck D, Heyninck K, Van Criekinge W, Vandenabeele P, Fiers W, Beyaert R
Laboratory of Molecular Biology, Flanders Interuniversity Institute for Biotechnology, University of Ghent, K. L. Ledeganckstraat 35, Ghent, B-9000, Belgium.
Biochem Biophys Res Commun. 1997 Sep 18;238(2):590-4. doi: 10.1006/bbrc.1997.7343.
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.
