這個基因編碼一個核定位的E3泛素連接酶。編碼蛋白可通過靶向腫瘤抑制蛋白（如p53）促進蛋白酶體降解形成腫瘤。這個基因本身是由p53轉錄調節的。這種基因座的過度表達或擴增可在多種不同的癌癥中檢測到。在2號染色體上有一個這個基因的假基因。選擇性剪接導致大量轉錄變異，其中許多可能只在腫瘤細胞中表達。
This gene encodes a nuclear-localized E3 ubiquitin ligase. The encoded protein can promote tumor formation by targeting tumor suppressor proteins, such as p53, for proteasomal degradation. This gene is itself transcriptionally-regulated by p53. Overexpression or amplification of this locus is detected in a variety of different cancers. There is a pseudogene for this gene on chromosome 2. Alternative splicing results in a multitude of transcript variants, many of which may be expressed only in tumor cells.