TRAF-interacting protein with forkhead-associated domain (TIFA)

TRAF-interacting protein with forkhead-associated domain (TIFA) is a cytosolic adapter protein with a forkhead-associated (FHA) domain that plays a central role in innate and adaptive immunity by transducing signals from pathogen-associated molecular patterns (PAMPs) to the activation of NF-κB and proinflammatory signaling pathways. Upon detection of bacterial metabolites such as heptose-1,7-bisphosphate (HBP), TIFA is phosphorylated (mainly at Thr9) by ALPK1, which induces its oligomerization and direct interaction with TRAF6, leading to TRAF6 polyubiquitination and activation of the IκB kinase complex. This process is essential for robust NF-κB signaling, which drives cytokine secretion and inflammatory responses to bacterial infection. TIFA also contributes to DNA damage response by relaying genotoxic stress signals to NF-κB activation via TRAF2 and NEMO ubiquitination. Dysregulation or abnormal expression of TIFA has been implicated in the progression and resistance of multiple cancers, exacerbation of inflammatory syndromes, and sepsis-induced injury. The molecular architecture of TIFA involves dimerization and dynamic oligomerization via its FHA domain and C-terminal TRAF-binding motifs, supporting its role as a scaffold in immune signaling complexes. No approved drugs directly target TIFA, though its centrality in immune signaling makes it a potential therapeutic target for immune-driven pathologies.

Other names

T2BPT6BPTIFAAMGC20791TRAF2 binding proteinTRAF6 binding proteinPutative MAPK-activating protein PM14Putative NF-kappa-B-activating protein 20TRAF-interacting protein with FHA domain-containing protein A

Not pharmacologically targeted by any approved drugs as of current knowledge. Notable mechanism: Oligomerization leads to TRAF6 polyubiquitination, thereby activating the NF-κB pathway and modulating inflammatory and immune responses.