2. Materials and Methods
2.1 Strains and plasmids
Escherichia coli TOP10[F- mcrA Δ(mrrhsdRMS-mcrBC) Δ80lacZΔ M15 ΔlacX74recA1 araΔ139Δ(ara-leu)7697 galU galK rpsL(StrR) endA1nupG] (Invitrogen) was used for the subcloning. S.cerevisiae strain TISTR 5339 was used as a host for
DNA transformation. C. shehatae TISTR 5843 and S. cerevisiae strains were obtained from MIRCEN,Thailand Institute of Science and Technology Research. The yeast expression vector pSFAU, which contains an SFA gene (Hyperresistance to formaldehyde) as a selection was constructed from previous work (22).