Abstract
A strain of Basidiobolus (N.C.L. 97.1.1) was isolated from plant detritus which secreted alkaline protease optimally active at pH 10.0. It is the first report of a protease from Basidiobolus, which is stable to and active under high alkaline conditions. When incubated under stationary conditions in broth cultures containing salts such as ammonium chloride, 'darmform' morphogenesis was readily induced through enlargement and internal division of the hyphal segments. Secretion of high activity alkaline protease was obtained in cultures initiated with darmform morphogenesis whereas cultures initiated from mycelial inocula grew as large pellets in submerged cultures, with little or no protease secretion. Cultural conditions favoring alkaline protease secretion have been optimized and a preliminary characterization of the enzyme is presented. Compatibility of the alkaline protease with commercial detergents as well as its potential application in recovering silver from spent photographic films have also been investigated.
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