To characterize the heterologous b-glucosidases
expressed in S. cerevisiae, cDNAs encoding full-length
T. reesei cel3b or A. aculeatus bgl1 with native signal sequences
were cloned into the S. cerevisiae expression vector pYEX-S1 and
transformed into S. cerevisiae INVSc1 under the control of the PGK
promoter, as described in Materials and Methods.