Putative inactive protein kinase which regulates signaling downstream of immune receptors including IL1R and Toll-like receptors (PubMed:10383454, PubMed:29686383). Inhibits dissociation of IRAK1 and IRAK4 from the Toll-like receptor signaling complex by either inhibiting the phosphorylation of IRAK1 and IRAK4 or stabilizing the receptor complex (By similarity). Upon IL33-induced lung inflammation, positively regulates expression of IL6, CSF3, CXCL2 and CCL5 mRNAs in dendritic cells (PubMed:29686383). {ECO:0000250|UniProtKB:Q8K4B2, ECO:0000269|PubMed:10383454, ECO:0000269|PubMed:29686383}. This is the function of IRAK3 (interleukin 1 receptor associated kinase 3, Ensembl gene identifier ENSG00000090376).