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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
Because of their agricultural value, there is a great body of research dedicated to understanding the microorganisms responsible for rumen carbon degradation. However, we lack a holistic view of the microbial food web responsible for carbon processing in this ecosystem. Here, we sampled rumen-fistulated moose, allowing first of its kind access to rumen microbial communities actively degrading woody plant biomass in real-time. We resolved 1,193 viral contigs and unique, near-complete microbial metagenome-assembled genomes (MAGs), many of which lacked previous metabolic insights. Plant-derived metabolites were measured with NMR and carbohydrate microarrays to quantify the carbon nutrient landscape. Network analyses directly linked measured metabolites to expressed proteins from these unique MAGs, revealing a genome-resolved three-tiered carbohydrate fueled trophic system. This provided a glimpse into microbial specialization into functional guilds defined by specific metabolites. To validate our proteomic inferences, the catalytic activity of a polysaccharide utilization locus from a highly connected metabolic hub genome was confirmed using heterologous gene expression. Viral detected proteins and linkages to microbial hosts demonstrate that phage are active controllers of rumen ecosystem function. Our findings elucidate the microbial and viral members, as well as their metabolic interdependencies, that support in situ carbon degradation in the rumen ecosystem.
Author(s): Solden LM, Naas AE, Roux S, Daly RA, Collins WB, Nicora CD, Purvine SO, Hoyt DW, Schückel J, Jorgensen B, Willats W, Spalinger DE, Firkins JL, Lipton MS, Sullivan MB, Pope PB, Wrighton KC
Publication type: Article
Publication status: Published
Journal: Nature Microbiology
Online publication date: 24/10/2018
Acceptance date: 25/07/2018
Date deposited: 02/07/2018
ISSN (electronic): 2058-5276
Publisher: Nature Publishing Group
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