Catalyzes the conversion of taxusin to 7-beta-hydroxytaxusin in taxol biosynthesis (PubMed:15157877). Catalyzes the conversion of 2-alpha-hydroxytaxusin to 2-alpha-7-beta-hydroxytaxusin in taxol biosynthesis (PubMed:15157877). O2 + reduced [NADPH--hemoprotein reductase] + taxusin = 7beta-hydroxytaxusin + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] 7beta-hydroxytaxusin + O2 + reduced [NADPH--hemoprotein reductase] = 2alpha,7beta-dihydroxytaxusin + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] Optimum pH is 7.5. Alkaloid biosynthesis; taxol biosynthesis. Belongs to the cytochrome P450 family.