The function of TIRAP (TIR domain containing adaptor protein, Ensembl gene identifier ENSG00000150455) is as follows. Adapter involved in TLR2, TLR4 and RAGE signaling pathways in the innate immune response. Acts via IRAK2 and TRAF-6, leading to the activation of NF-kappa-B, MAPK1, MAPK3 and JNK, and resulting in cytokine secretion and the inflammatory response. Positively regulates the production of TNF (TNF) and interleukin-6 (IL6). {ECO:0000269|PubMed:18292575, ECO:0000269|PubMed:19509286, ECO:0000269|PubMed:21829704}.