Catalyzes the oxidation of D-arabinose, L-xylose, L-fucose and L-galactose in the presence of NADP(+). D-arabinose + NADP(+) = D-arabinono-1,4-lactone + H(+) + NADPH D-arabinose + NAD(+) = D-arabinono-1,4-lactone + H(+) + NADH Optimum pH is 10.0. Optimum temperature is about 30 degrees Celsius. Heterodimer of a heavy chain and a light chain. Present with 30200 molecules/cell in log phase SD medium. Belongs to the aldo/keto reductase family.