obsolete regulation of 1-phosphatidylinositol-4-phosphate 5-kinase activity (obsolete GO:0090215)
OBSOLETE. Any process that modulates the frequency, rate or extent of the catalysis of the reaction: ATP + 1-phosphatidyl-1D-myo-inositol 4-phosphate = ADP + 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate.