Measurement of enzyme activity
β-Glucosidase activity was measured by quantifying
the release of pNP (p-nitrophenol) from pNP-βGlc as
described previously [50]. One unit of pNP-βGlcase
activity was defined as the amount of enzyme required to
release 1 μmol pNP per min. All protein concentrations
were measured using the Bradford method and bovine
serum albumin as a standard [47].