Changes in activity of fructose-1,6-bisphosphate aldolase in livers of fasted rabbits and accumulation of crossreacting immune material.

Abstract
The activity of fructose-1,6-bisphosphate aldolase in livers of fasted rabbits decreases to less than 1/2 the value found in livers of fed rabbits. The concentration of aldolase protein in the liver extracts, measured with a specific antibody, remains unchanged. More than twice as much antibody is required to neutralize the adolase activity in liver extracts from fasted compared with fed rabbits. Modification of liver aldolase apparently occurs during fasting, resulting in loss of catalytic activity without loss of immunoreactivity.