Abstract
Three immunologically and enzymatically distinct endoglucanases of Cellulomonas sp. ATCC 21399 were purified previously. Endoglucanase A and endoglucanase B acted synergistically on microcrystalline cellulose (Avicel), whereas no synergistic action was observed between endoglucanase B or endoglucanase C. Only endoglucanase A was capable of hydrolyzing Avicel when acting alone and this enzyme resulted in "short fiber formation" when acting on Avicel. The end product of hydrolysis of acid swollen Avicel produced by the three endoglucanases was in all cases dominated by cellobiose and showed lower content of glucose and cellotriose. Higher cellodextrins appeared as transient end products. The results indicate that the function of endoglucanase A in the cellulase system of Cellulomonas might be very similar to the function of the cellobiohydrolases of Trichoderma reesei.
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