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Summary: Protoplast release from young mycelium of Schizophyllum commune by a lytic enzyme preparation from Trichoderma viride was accompanied by degradation of the three wall polymers, s-glucan, r-glucan and chitin. Part of the s-glucan was resistant. The resistance of s-glucan to enzymatic degradation increased with culture age and concomitantly the yield of protoplasts was reduced. Isolated s-glucan was also partly resistant to degradation, probably due to its crystallinity. In living cells s-glucan protected chitin and possibly r-glucan against degradation by external enzymes. s-glucanase, r-glucanase, chitinase and exo-laminarinase were purified from the Trichoderma enzyme mixture. Addition of only s-glucanase and chitinase was essential for protoplast release; r-glucan was degraded endogenously.
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