phosphatidylinositol 3-kinase complex phosphatidylinositol 3-kinase complex, class II A phosphatidylinositol 3-kinase complex that contains a catalytic subunit of a phosphatidylinositol 3-kinase (PI3K) enzyme and one or more adaptor proteins. There is no known obligatory regulatory subunit. The class II PI3K (PI3KC2) subfamily of genes has members in vertebrates, worm and fly, but none in yeast. class II phosphatidylinositol 3-kinase complex class II PI3K complex 2014-09-16T13:14:17Z GO:0097652 cellular_component pr