Abstract
Streptomyces fradiae IFO 3439 elaborated enzymes with macerating activity toward various plant tissues. The optimum pH of the macerating activity was about 8.0 when the crude enzyme preparation acted on disks of potato tuber or pieces of Ganpi (Wikstroemia sikokiana Fr. et Sav.) bark. Pectolytic activities in this preparation toward free pectin or poly-galacturonic acid were considerably lower than those of fungi or bacteria. However, when the crude enzyme preparation acted on native pectin in Ganpi bark, about 90 per cent of the galacturonic acid residues were recovered as the polygalacturonides having a still high degree of polymerization. These results suggested that the crude enzyme of S. fradiae solubilized Ganpi pectin, degrading it to only a very small extent.
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