Title: Interspecies cross-feeding orchestrates carbon degradation in the rumen ecosystem

Journal Article · · Nature Microbiology
 [1];  [2]; ORCiD logo [1];  [1];  [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4];  [5];  [5];  [6];  [7];  [1]; ORCiD logo [4]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]
  1. The Ohio State Univ., Columbus, OH (United States)
  2. Norwegian Univ. of Life Sciences, Aas (Norway)
  3. Alaska Dept. of Fish and Game, Palmer, AK (United States)
  4. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  5. Univ. of Copenhagen, Copenhagen (Denmark)
  6. Newcastle Univ., Newcastle upon Tyne (United Kingdom)
  7. Univ. of Alaska Anchorage, Anchorage, AK (United States)

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 77 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. In conclusion, our findings elucidate the microbial and viral members, as well as their metabolic interdependencies, that support in situ carbon degradation in the rumen ecosystem.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231; AC05-76RL01830
OSTI ID:
1491408
Report Number(s):
PNNL-SA-131180
Journal Information:
Nature Microbiology, Journal Name: Nature Microbiology Journal Issue: 11 Vol. 3; ISSN 2058-5276
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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