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Fig. 7 | Biotechnology for Biofuels and Bioproducts

Fig. 7

From: Selfish uptake versus extracellular arabinoxylan degradation in the primary degrader Ruminiclostridium cellulolyticum, a new string to its bow

Fig. 7

Model for arabinoxylan utilization by R. cellulolyticum in its natural biotope Cellulosomes depicted in light gray release large AXOS, short XOS and monosaccharides from arabinoxylan. A signal is transmitted from the sensor XuaS to the regulator XuaR (light blue) which subsequently induces the expression of the genes of the xua cluster (orange arrows). The ABC-transporter (red) imports a large range of AXOS from the environment in the cytoplasm, where GHs (light green) and esterases (dark blue) ultimately release arabinose, xylose and xylobiose. Xylobiose might be degraded by another unknown GH. Short XOS and monosaccharides might also be imported by R. cellulolyticum and other species found in the same biotope. Unknown function proteins are depicted in dark grey (XuaI, β-xylosidase and monosaccharide importer, NBD)

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