Fig. 6: Model of plant non-cellulosic β-glucans depolymerization by the herbivore gut Bacteroidota PUL. | npj Biofilms and Microbiomes

Fig. 6: Model of plant non-cellulosic β-glucans depolymerization by the herbivore gut Bacteroidota PUL.

From: A functionally augmented carbohydrate utilization locus from herbivore gut microbiota fueled by dietary β-glucans

Fig. 6

General non-cellulosic β-glucans structure comprises β(1–4)-linked cellotetraose and cellotriose units connected by β(1–3) linkages, while the structure of brown algae laminarin consists of β(1,3)-linked glucosyl units with single β(1,6)-linked glucosyl substitutions. In the herbivore gut Bacteroidota, the cell-surface localized endo-glucanase CapGH16_3 cleaves polymeric non-cellulosic β-glucans into oligosaccharides that are then imported into the periplasm via a TonB-dependent transporter. Periplasmic β-glucosidases, predicted in silico using the Psortb 3.0 software64, CapGH3a, and CapGH3b, act on the non-reducing ends to release glucose. *CapSGBP-B and CapSusD-like representations are based on modeled structures.

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