This is a TRAF (C2H2)-type zinc finger found in TRAD1 and XIAF1. TRAFD1 is a negative feedback regulator that controls excessive innate immune responses [1]. XIAF1 seems to function as a negative regulator of members of the IAP (inhibitor of apoptosis protein) family [2]. These proteins share amino acid identity with zinc fingers of TRAF6 [2].

1: FLN29, a novel interferon- and LPS-inducible gene acting as a negative regulator of toll-like receptor signaling. Mashima R, Saeki K, Aki D, Minoda Y, Takaki H, Sanada T, Kobayashi T, Aburatani H, Yamanashi Y, Yoshimura A; J Biol Chem. 2005;280:41289-41297. PMID:16221674

2: Identification of XAF1 as an antagonist of XIAP anti-Caspase activity. Liston P, Fong WG, Kelly NL, Toji S, Miyazaki T, Conte D, Tamai K, Craig CG, McBurney MW, Korneluk RG; Nat Cell Biol. 2001;3:128-133. PMID:11175744