Involved in the regulation of innate immune response. Acts as negative regulator of Toll-like receptor and interferon-regulatory factor (IRF) signaling pathways. Contributes to the negative regulation of transcriptional activation of NF-kappa-B target genes in response to endogenous pro-inflammatory stimuli (By similarity). Interacts with CACTIN (via N-terminal domain); the interaction occurs in a pro-inflammatory-independent manner. Nuclear localization with a speckled expression pattern in some cells. Colocalizes with CACTIN in the nucleus (By similarity).