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A thermophilic fungus, K1014, newly derived from a compost was selected on the basis of protease productivity as the only one of 81 isolates to produce high levels of acid protease. The fungus was namedPenicillium duponti K1014 based on taxonomical studies. It grew in the temperature range of 28 to 58 C, and the optimum was 45 to 50 C. These temperature characteristics showed that the fungus was the most strongly thermophilic of all the fungi next toHumicola lanuginosa . WhenP. duponti K1014 was grown on moistened wheat bran, maximal accumulation of acid protease occurred after 2 days at 45 to 50 C. The addition of ammonium salts, but not nitrate, was effective for the production of the acid protease. The acid protease ofP. duponti K1014 was stable at 60 C for 1 hr and retained more than 65% of original activity after the treatment for 1 hr at 70 C atp H 4.7. This thermal property was different from those of the ordinary acid proteases, indicating that the enzyme is a thermostable protein.

Thermostable Acid Protease Produced by Penicillium duponti K1014, a True Thermophilic Fungus Newly Isolated from Compost