Abstract
Cellulosimicrobium cellulans, which is type species of the genus Cellulosimicrobium, produces xylanase predominant nanoscale multienzyme complexes, i.e., xylanosomes, when grown on water-insoluble polysaccharides. Here, we report on the isolation of similar multienzyme complexes (MECs) produced by two other species in genus Cellulosimicrobium (Cellulosimicrobium funkei and Cellulosimicrobium terreum). Functional studies and subunit structure identifications using genomic sequencing and proteomic techniques were also performed. When compared with the xylanosomes produced by C. cellulans F16, the isolated MECs showed a larger particle size and shared at least three conserved multidomain proteins. In addition, they also exhibited different enzymatic activities and subunit compositions, which indicates diverse capability and strategies in degrading hemicelluloses.
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