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The production of ribonucleic acid (RNA)-depolymerase-forming 5′-nucleotides (5′-nuclease) was investigated with the fungusAspergillus quercinus in media containing 68, 10, 5, 3, 1, and 0.5 mg of phosphorus per 100 ml. Yields were maximal with 5 mg of phosphorus per 100 ml. RNA-depolymerase-forming 3′-nucleosides (3′-nuclease) and phosphomonoesterase were maximal in media containing 1 and 0.5 mg of phosphorus per 100 ml. The 5′-nuclease was purified approximately 530-fold with a recovery of 84% by column chromatography on diethylaminoethyl-cellulose and by gel filtration through Sephadex G-100. The purified enzyme was capable of acting on both deoxyribonucleic acid and RNA, and the 5′-mononucleotides produced were identified by paper chromatography. The enzyme 5′-nuclease appears to be one of the repressible exonucleases that are active in the production of 5′-mononucleotides.

Production of Nuclease-forming 5′-Nucleotide by Aspergillus quercinus in a Low Phosphate Medium