General strategies of cellulose hydrolysis and utilization by aerobic (top) and anaerobic (bottom) bacteria. General strategies of cellulose hydrolysis.

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Presentation transcript:

General strategies of cellulose hydrolysis and utilization by aerobic (top) and anaerobic (bottom) bacteria. General strategies of cellulose hydrolysis and utilization by aerobic (top) and anaerobic (bottom) bacteria. Cellulose, degradation products, and cellular features are not shown to scale. Some features of the alternate strategy type are utilized by one or more species. For example, the cellulase of the anaerobe Clostridium stercorarium is of the noncomplexed type, and members of the facultatively anaerobic Cellulomonas utilize an aerobic-type strategy for hydrolyzing cellulose but perform a mixed-acid fermentative catabolism of the hydrolytic products. Glycocalyces are the dominant means of adhesion among ruminal cellulolytic bacteria, but the importance of such structures in other anaerobic groups has not yet been systematically investigated. Refer to Fig. 1 for a more detailed comparison of complexed and noncomplexed systems at the enzymatic level. Lee R. Lynd et al. Microbiol. Mol. Biol. Rev. 2002; doi:10.1128/MMBR.66.3.506-577.2002