E3 ubiquitin-protein ligase that acts as a negative regulator of NOD2 signaling by mediating ubiquitination and degradation of RIPK2 (PubMed:28656966). Also catalyzes ubiquitination and proteasomal degradation of CANX within the endoplasmic reticulum (PubMed:21205830). Could have a role in spermatogenesis (By similarity). {ECO:0000250|UniProtKB:Q9DAH2, ECO:0000269|PubMed:21205830, ECO:0000269|PubMed:28656966}. This is the function of ZNRF4 (zinc and ring finger 4, ENSG00000105428).