2.7.1.3 A43T decreased thermostability of ketohexokinase-A and ketohexokinase-C 641285 2.7.1.3 G40R both ketohexokinase-A and ketohexokinase-C become inactive and largely unsoluble 641285 2.7.1.3 additional information heterologous expression of the enzyme in potato plants, showing elevated activity in leaves and tubers, leads to inhibited rates of photosynthesis, severe growth retardation and abnormal leaf development, phenotype analysis 660306