Bridging factor that mediates the recruitment of CYLD to the LUBAC complex, thereby regulating TNF-induced necroptosis (PubMed:27307491, PubMed:27458237, PubMed:27545878, PubMed:27591049). Acts as a direct binding intermediate that bridges RNF31/HOIP, the catalytic subunit of the LUBAC complex, and the deubiquitinase (CYLD), thereby recruiting CYLD to the TNF-R1 signaling complex (TNF-RSC) (PubMed:27458237, PubMed:27545878, PubMed:27591049). Required to activate the 'Met-1'- (linear) and 'Lys-63'-linked deubiquitinase activities of CYLD (PubMed:27458237, PubMed:27591049). Controls the kinase activity of RIPK1 and TNF-induced necroptosis by promoting 'Met- 1'-linked deubiquitination of RIPK1 by CYLD (By similarity). {ECO:0000250|UniProtKB:Q8K004, ECO:0000269|PubMed:27307491, ECO:0000269|PubMed:27458237, ECO:0000269|PubMed:27545878, ECO:0000269|PubMed:27591049}. This is the function of Ensembl gene identifier ENSG00000158480 (SPATA2, spermatogenesis associated 2).