Unlike FOL2, overexpression of ABZ1 in wine yeast had little
effect on folate levels in the final product. In fact, in Pinot Noir, overexpression
of ABZ1 actually resulted in a slight decrease in folate
levels. Overexpression of ABZ1 and FOL2 together produced folate
levels that were not significantly different from overexpression of
FOL2 alone. Therefore, gene expression levels of ABZ1 do not appear
to be a determinative factor in the production of folate in wine