Enables phosphatidylinositol 3-kinase regulatory subunit binding activity. Involved in several processes, including negative regulation of cell population proliferation; negative regulation of cytokine production; and negative regulation of defense response. Acts upstream of or within negative regulation of I-kappaB kinase/NF-kappaB signaling; regulation of protein ubiquitination; and response to lipopolysaccharide. Predicted to be located in centriolar satellite; intracellular membrane-bounded organelle; and perinuclear region of cytoplasm. Predicted to be active in cytosol. Orthologous to human NLRC3 (NLR family CARD domain containing 3). [provided by Alliance of Genome Resources, Apr 2022]