opsonin binding | cation binding | complement binding | hydrolase activity | complement component C4b binding | catalytic activity | serine hydrolase activity | calcium-dependent protein binding | ion binding | carbohydrate binding | protein binding | serine-type endopeptidase activity | serine-type peptidase activity | calcium ion binding | endopeptidase activity | metal ion binding | peptidase activity
positive regulation of immune response | adaptive immune response | proteolysis | complement activation | regulation of immune system process | defense response | regulation of immune response | response to stimulus | positive regulation of immune system process | response to stress | adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains | nitrogen compound metabolic process | leukocyte mediated immunity | protein activation cascade | humoral immune response | activation of immune response | protein metabolic process | complement activation, classical pathway | metabolic process | immune response | organic substance metabolic process | serine-type endopeptidase activity | serine-type peptidase activity | humoral immune response mediated by circulating immunoglobulin | complement activation, lectin pathway | endopeptidase activity | B cell mediated immunity | innate immune response | immunoglobulin mediated immune response | immune system process | peptidase activity | macromolecule metabolic process