2-oxoglutarate + L-histidinol phosphate = 3-(imidazol-4-yl)-2-oxopropyl phosphate + L-glutamate Amino-acid biosynthesis; L-histidine biosynthesis; L-histidine from 5-phospho-alpha-D-ribose 1-diphosphate: step 7/9. Homodimer. Mainly expressed in green tissues. Belongs to the class-II pyridoxal-phosphate-dependent aminotransferase family. Histidinol-phosphate aminotransferase subfamily.