Positively regulates TLR3- and TLR4-mediated signaling pathways by bridging the interaction between TLR3 or TLR4 and TICAM1. Promotes TLR3/4 ligand-induced activation of transcription factors IRF3 and NF-kappa-B, as well as the production of IFN-beta and inflammatory cytokines (PubMed:25736436). Binds PtdIns3P in vitro with high specificity over other phosphoinositides. Interacts (via WD repeat 2) with tyrosine-phosphorylated TLR3 (via TIR domain) in response to poly(I:C) (PubMed:25736436). Interacts with TICAM1 in response to poly(I:C) (By similarity). Interacts with TLR4 in response to LPS (By similarity). The FYVE-type zinc finger domain mediates interactions with phosphatidylinositol 3-phosphate in membranes of early endosomes and penetrates bilayers. The FYVE domain insertion into PtdIns(3)P-enriched membranes is substantially increased in acidic conditions. The FYVE domain is required for its function in regulating TLR3 signaling (PubMed:25736436). Extended N-terminus.