Enables 1-phosphatidylinositol 4-kinase activity. Predicted to be involved in several processes, including phosphatidylinositol phosphate biosynthetic process; phosphatidylinositol-mediated signaling; and viral replication complex formation and maintenance. Predicted to act upstream of or within phosphorylation. Located in Golgi-associated vesicle membrane. Orthologous to human PI4KA (phosphatidylinositol 4-kinase alpha). [provided by Alliance of Genome Resources, Apr 2022]