Involved in reduction steps of the biosynthesis of plant campesterol-derivative steroids, ending to castasterone (CS) but missing brassinolide (BL) (PubMed:32146811). Catalyzes the C6-oxidation step in brassinosteroids biosynthesis; the conversion of 6-deoxoteasterone (6-deoxoTE) to teasterone (TE), 3-dehydro-6-deoxoteasterone (6-deoxo3DT, 6-deoxo-3-DHT) to 3-dehydroteasterone (3DT, 3-DHT), 6-deoxotyphasterol (6-deoxoTY) to typhasterol (TY) and of 6-deoxocastasterone (6-deoxoCS) to castasterone (CS) (PubMed:32146811). 6-deoxoteasterone + O2 + reduced [NADPH--hemoprotein reductase] = 6alpha-hydroxyteasterone + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] 6alpha-hydroxytyphasterol + O2 + reduced [NADPH--hemoprotein reductase] = H(+) + 2 H2O + oxidized [NADPH--hemoprotein reductase] + teasterone 3-dehydro-6-deoxoteasterone + O2 + reduced [NADPH--hemoprotein reductase] = 3-dehydro-6alpha-hydroxyteasterone + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] 3-dehydro-6alpha-hydroxyteasterone + O2 + reduced [NADPH--hemoprotein reductase] = 3-dehydroteasterone + H(+) + 2 H2O + oxidized [NADPH--hemoprotein reductase] 6-deoxotyphasterol + O2 + reduced [NADPH--hemoprotein reductase] = 6alpha-hydroxytyphasterol + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] 6alpha-hydroxytyphasterol + O2 + reduced [NADPH--hemoprotein reductase] = H(+) + 2 H2O + oxidized [NADPH--hemoprotein reductase] + typhasterol 6-deoxocastasterone + O2 + reduced [NADPH--hemoprotein reductase] = 6alpha-hydroxycastasterone + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] 6alpha-hydroxycastasterone + O2 + reduced [NADPH--hemoprotein reductase] = castasterone + H(+) + 2 H2O + oxidized [NADPH--hemoprotein reductase] 3-dehydro-6-deoxoteasterone + 2 O2 + 2 reduced [NADPH--hemoprotein reductase] = 3-dehydroteasterone + 2 H(+) + 3 H2O + 2 oxidized [NADPH--hemoprotein reductase] 6-deoxocastasterone + 2 O2 + 2 reduced [NADPH--hemoprotein reductase] = castasterone + 2 H(+) + 3 H2O + 2 oxidized [NADPH--hemoprotein reductase] 6-deoxoteasterone + 2 O2 + 2 reduced [NADPH--hemoprotein reductase] = 2 H(+) + 3 H2O + 2 oxidized [NADPH--hemoprotein reductase] + teasterone 6-deoxotyphasterol + 2 O2 + 2 reduced [NADPH--hemoprotein reductase] = 2 H(+) + 3 H2O + 2 oxidized [NADPH--hemoprotein reductase] + typhasterol Plant hormone biosynthesis; brassinosteroid biosynthesis. Belongs to the cytochrome P450 family.