E3 ubiquitin ligase catalyzing the covalent attachment of ubiquitin moieties onto substrate proteins. Involved in the TLR and IL- 1 signaling pathways via interaction with the complex containing IRAK kinases and TRAF6. Mediates IL1B-induced IRAK1 'Lys-63'-linked polyubiquitination and possibly 'Lys-48'-linked ubiquitination. May be important for LPS- and IL1B-induced MAP3K7-dependent, but not MAP3K3- dependent, NF-kappa-B activation. Can activate the MAP (mitogen activated protein) kinase pathway leading to activation of ELK1. {ECO:0000269|PubMed:12804775, ECO:0000269|PubMed:12860405, ECO:0000269|PubMed:17675297, ECO:0000269|PubMed:17997719, ECO:0000269|PubMed:22669975}. This is the function of PELI2 (pellino E3 ubiquitin protein ligase family member 2, ENSG00000139946).