Which event occurs first in break down of cellulose
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Cellulose Degradation
Aerobic cellulose-degrading bacteria characteristically use a free cellulase mechanism in which multiple secreted enzymes act synergistically. Anaerobic cellulose degraders, which account for 5–10% of all cellulose decomposition, are known to have two mechanisms for cellulose decomposition. The first is the use of a cellulosome complex of cellulolytic enzymes, first characterized in clostridial species but also shown to occur in the human gut bacterium Ruminococcus flavefaciens in a more complex organization [24]. The cellulosome complex is attached to the outer cell envelope of the bacterium and contains proteins with cohesion domains (two types) that bind strongly to the dockerin domains of the cellulolytic enzymes. In addition the scaffoldin often has a separate cellulose-binding domain (CBM) for binding to the celullosic substrate. The second is the system used by Fibrobacter succinogenes (formerly Bacteroides succinogenes) in which cellulose is attached to the outer membrane through adhesins, e.g. fibro-slime proteins and possibly type IV pilins
Aerobic cellulose-degrading bacteria characteristically use a free cellulase mechanism in which multiple secreted enzymes act synergistically. Anaerobic cellulose degraders, which account for 5–10% of all cellulose decomposition, are known to have two mechanisms for cellulose decomposition. The first is the use of a cellulosome complex of cellulolytic enzymes, first characterized in clostridial species but also shown to occur in the human gut bacterium Ruminococcus flavefaciens in a more complex organization [24]. The cellulosome complex is attached to the outer cell envelope of the bacterium and contains proteins with cohesion domains (two types) that bind strongly to the dockerin domains of the cellulolytic enzymes. In addition the scaffoldin often has a separate cellulose-binding domain (CBM) for binding to the celullosic substrate. The second is the system used by Fibrobacter succinogenes (formerly Bacteroides succinogenes) in which cellulose is attached to the outer membrane through adhesins, e.g. fibro-slime proteins and possibly type IV pilins
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