Therefore, we also used this simple and reliable fluorescence
spectrometry assay after staining with Nile red to quantify the
amount of TAG that accumulated in the S. cerevisiae wild-type cells,
QM cells transformed with the control plasmid pYES2 and QM
cells expressing either CtDGAT2a or CtDGAT2b. The fluorescence
increase (DF) of QM cells expressing each CtDGAT2
isozyme was found to be significantly more than wild-type S.
cerevisiae cells and extremely high compared to the QM cells
harboring the non-recombinant plasmid without the gene of
interest (Figure 4D). Estimation showed that the accumulation of
TAG is 12.5% more in the QM cells transformed with the
CtDGAT2b gene compared to that with the CtDGAT2a gene.
Therefore, the finding elucidated that the isozyme CtDGAT2b is
catalytically superior and capable of producing more storage lipid
than the CtDGAT2a isozyme