Cellobiohydrolase B,asecond exo-cellobiohydrolase fromthecellulolytic bacterium Cellulomonas fimi

very lowactivity onCM-cellulose. Viscometric analysis ofCM-cellulosehydrolysisindicatesthattheenzymeis anexoglucanase.Cellobiose is the major product of hydrolysis of cellulose. Incommonwith twoother exoglycanases from C.fimi, CbhBhaslow but detectable endoglucanase activity. CbhBis the secondexo-cellobiohydrolase found in C.fimi. Therefore, the cellulasesystemofC.fimiresemblesthoseoffungiincomprisingmultipleendoglucanases andcellobiohydrolases.