Has dehydrogenase activity against 11 beta-hydroxysteroid and 17 beta-hydroxysteroid. May be involved in signal transduction regulated by various sterols. an 11beta-hydroxysteroid + NADP(+) = an 11-oxosteroid + H(+) + NADPH Surface of oil bodies. Exists at a monolayer lipid/water interface. Expressed in seeds (at protein level). The proline-knob motif may be involved in the targeting to oil bodies. Belongs to the short-chain dehydrogenases/reductases (SDR) family.