Predicted to enable several functions, including calcium-dependent protein binding activity; complement component C4b binding activity; and serine-type endopeptidase activity. Acts upstream of or within complement activation, lectin pathway. Predicted to be located in extracellular region. Predicted to be active in extracellular space. Is expressed in several structures, including brain and liver. Orthologous to human MASP2 (MBL associated serine protease 2). [provided by Alliance of Genome Resources, Apr 2022]