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Official Full Name: aldolase, fructose-bisphosphate B<br />Also known as: ALDB; ALDO2<br />Fructose-1,6-bisphosphate aldolase (EC 4.1.2.13) is a tetrameric glycolytic enzyme that catalyzes the reversible conversion of fructose-1,6-bisphosphate to glyceraldehyde 3-phosphate and dihydroxyacetone phosphate . There are 3 aldolase isozymes in vertebrates, which differ by their electrophoretic and catalytic properties. The differences suggest that aldolases A, B, and C are distinct proteins, products of a related "housekeeping" gene family that exhibit developmentally regulated expression of distinct isozymes. Developing embryos produce aldolase A, and even more so in adult muscle, which can account for up to 5% of total cellular protein. In the adult liver, kidney, and intestine, expression of aldolase A is repressed and aldolase B is produced. Aldolases A and C are expressed in roughly equal amounts in the brain and other neural tissues. Aldolase a and c have a high degree of homology. ALDOB deficiency causes hereditary fructose intolerance.