Extracellular purine β-ribosidases from fungi

Abstract

Purine β-ribonucleosidases are inducible enzymes secreted into the growth medium by several species of Aspergillus and Penicillium. They act on purine β-N-ribosides to produce p urine and ribose, but do not hydrolyze pyrimidine β-N-ribosides, deoxyribonucleosides, or β-O-ribosides. Nucleosidase g has properties different from nucleosidase a, one of which is the added ability to hydrolyze adenosine 5′-phosphate to adenine and ribose 5′-phosphate.