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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Kinetic studies of bovine liver fructose-1,6-bisphosphatase.

Initial rate kinetic studies with bovine liver fructose-1,6-bisphosphatase were carried out in both directions of the reaction to determine the sequence of product release from the enzyme. Product inhibition by fructose-6-P was found to be S-linear, I-linear noncompetitive relative to fructose-1,6-bisphosphate, whereas inorganic orthophosphate was determined to be linear competitive with respect to the substrate. The kinetics of the reverse reaction were studied by coupling the phosphatase reaction to the aldolase, triosephosphate isomerase, and glycerolphosphate dehydrogenase reactions. The kinetic results were found to be in harmony with the Uni Bi ordered and random sequential mechanisms as well as a Uni Bi ping-pong mechanism. The nomenclature is that of Cleland (Cleland, W.W. (1963) Biochim. Biophys. Acta 67, 104-137). However, nonkinetic considerations, when taken together with the kinetic results, suggest that the steady state ordered Uni Bi mechanism is the most likely possibility. There is evidence that isomerization of the binary complex of enzyme and phosphate occurs in the kinetic mechanism. Although magnesium is required for the reverse reaction, there is no evidence to suggest that the enzyme discriminates between the magnesium-associated or divalent cation-free forms of the substrates.[1]


  1. Kinetic studies of bovine liver fructose-1,6-bisphosphatase. Casazza, J.P., Stone, S.R., Fromm, H.J. J. Biol. Chem. (1979) [Pubmed]
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