Enables ubiquitin conjugating enzyme activity. Involved in placenta development. Acts upstream of or within embryonic placenta development; negative regulation of apoptotic process; and positive regulation of cell population proliferation. Located in membrane. Is expressed in several structures, including genitourinary system; heart; liver; lung; and spleen. Orthologous to human BIRC6 (baculoviral IAP repeat containing 6). [provided by Alliance of Genome Resources, Apr 2022]