Other glycolytic enzymes are also important to
accumulate sugar. Especially, fructokinase is important
to regulate the level of fructose that is the primary product
of sucrose and sorbitol. Kanayama et al. (1997, 1998)
purified isozymes FrK1 and FrK2, isolated the cDNA
of each isozyme, and showed the expression of FrK1 in