Hydrolyzes a variety of simple alpha-D-galactoside as well as more complex molecules such as oligosaccharides and polysaccharides. Active on paranitrophenyl-alpha-galactoside but not on raffinose, locust bean gum and gum guar. Hydrolysis of terminal, non-reducing alpha-D-galactose residues in alpha-D-galactosides, including galactose oligosaccharides, galactomannans and galactolipids. Optimum pH is 5.0. Optimum temperature is 52 degrees Celsius. Belongs to the glycosyl hydrolase 27 family.