Outer membrane vesicles from Fibrobacter succinogenes S85 contain an array of carbohydrate‐active enzymes with versatile polysaccharide‐degrading capacity
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Fibrobacter succinogenes is an anaerobic bacterium naturally colonising the rumen and cecum of herbivores where it utilizes an enigmatic mechanism to deconstruct cellulose into cellobiose and glucose, which serve as carbon sources for growth. Here, we illustrate that outer membrane vesicles (OMVs) released by F. succinogenes are enriched with carbohydrate-active enzymes and that intact OMVs were able to depolymerize a broad range of linear and branched hemicelluloses and pectin, despite the inability of F. succinogenes to utilize non-cellulosic (pentose) sugars for growth. We hypothesize that the degradative versatility of F. succinogenes OMVs is used to prime hydrolysis by destabilising the tight networks of polysaccharides intertwining cellulose in the plant cell wall, thus increasing accessibility of the target substrate for the host cell. This is supported by observations that OMV-pretreatment of the natural complex substrate switchgrass increased the catalytic efficiency of a commercial cellulose-degrading enzyme cocktail by 2.4-fold. We also show that the OMVs contain a putative multiprotein complex, including the fibro-slime protein previously found to be important in binding to crystalline cellulose. We hypothesize that this complex has a function in plant cell wall degradation, either by catalysing polysaccharide degradation itself, or by targeting the vesicles to plant biomass.
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Membrane vesicles can contain high concentrations of glycosyl hydrolases, allowing F. succinogenes to effectively degrade plant cellulose.
“These membrane vesicles can contain high concentrations of glycosyl hydrolases, allowing F. succinogenes to effectively degrade plant cellulose (Arntzen et al., 2017).”
From Addressing global ruminant agricultural challenges through understanding the rumen microbiome: past, present, and future (2018) · cites this paper as Arntzen et al., 2017
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- Authors
- Arntzen, M. Ø., Várnai, A., Mackie, R. I., Eijsink, V. G. H., & Pope, P. B.
- Affiliations
- Norwegian University of Life Sciences (NO)
- University of Illinois Urbana-Champaign (US)
- Corresponding author
- Arntzen, Magnus Ø.
- Venue
- Environmental Microbiology
- Publisher
- Wiley
- Published
- 2017-05-29
- Volume
- 19
- Issue
- 7
- Pages
- 2701-2714
- ISSN
- 1462-2912 (ISSN-L)
- 1462-2920
- OpenAlex
- W2608604719
- Cited by
- 76
- References
- 48
- Citations by year
- 2026: 7 · 2025: 4 · 2024: 12 · 2023: 7 · 2022: 7 · 2021: 12 · 2020: 10 · 2019: 9 · 2018: 8
- FWCI
- 3.33
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Licence
- Locations
- Environmental Microbiology (publishedVersion)
- PubMed (publishedVersion)
- BIBSYS Brage (BIBSYS (Norway)) (submittedVersion, cc-by-nc-nd)
- NORA - Norwegian Open Research Archives (submittedVersion, other-oa)
- Funders
- European Research Council (336355)
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Biofuel production and bioconversion
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Polysaccharides and Plant Cell Walls
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biotechnology › Enzyme Production and Characterization
- Keywords
- Fibrobacter succinogenes, outer membrane vesicles, carbohydrate-active enzymes, polysaccharide degradation, hemicellulose, pectin, cellulose degradation, rumen bacteria, switchgrass, plant cell wall degradation, anaerobic digestion
- MeSH terms
- Extracellular Vesicles, Animals, Cell Wall, Cellulose, Glucose, Hydrolysis, Pectins, Plants, Polysaccharides, Rumen, Fibrobacter, Carbohydrate Metabolism, Plant Cells
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