The laboratory
S. cerevisiae strain FY5 (Mat a and α, S288C background)
was used as the background strain for constructing mutants.
The mutants in this study were made by first PCR-amplifying an antibiotic
resistance marker surrounded by Lox sites, followed by transformation
of the construct into the yeast to delete the targeted gene in the
genome following the protocol from Gietz and Woods (2006).
Two different
antibiotic resistance markers (Kanamycin A and HygromycinB) were used in this study to be able to select double mutants on selective media containing both antibiotics.
The single deletions with each different marker were mated to obtain diploid yeasts with double deletion.
The diploid cells were then sporulated to obtain haploid cells with both deletions and antibiotic resistance markers.
Primer sequences used in this study are listed in Table A in Appendix A. Deletions were con- firmed by PCR using the primers listed in Table B in Appendix A.