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The fungusAspergillus ficuum NRRL 3135 is known to produce an extracellular nonspecific orthophosphoric monoester phosphohydrolase (EC 3.1.3.2) with ap H optimum of 2.0, as well as an extracellularmyo -inositol hexaphosphate phosphohydrolase (EC 3.1.3.8; phytase) withp H optima of 2.0 and 5.5. Both these enzymes are also known to hydrolyzemyo -inositol hexaphosphate. The pentaphosphates liberated in the first step of this hydrolysis have been isolated and identified by ion-exchange chromatography and optical rotation. The nonspecific orthophosphoric monoester phosphohydrolase produces a single pentaphosphate,d -myo -inositol-1,2,4,5,6-pentaphosphate, whereas the phytase, at bothp H 2.0 and 5.5, produces a mixture of two pentaphosphates. The major component of this mixture isd -myo -inositol-1,2,4,5,6-pentaphosphate and the other isd -myo -inositol-1,2,3,4,5-pentaphosphate. Thus the pathways of dephosphorylation ofmyo -inositol hexaphosphate by these two enzymes differ from that of wheat-bran phytase which formsl -myo -inositol-1,2,3,4,5-pentaphosphate.

Inositol Phosphate Phosphatases of Microbiological Origin: the Inositol Pentaphosphate Products of Aspergillus ficuum Phytases