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Metabolic network analysis reveals microbial community interactions in anammox granules
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Metabolic network analysis reveals microbial community interactions in anammox granules
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Journal Article
Metabolic network analysis reveals microbial community interactions in anammox granules
2017
Overview
Microbial communities mediating anaerobic ammonium oxidation (anammox) represent one of the most energy-efficient environmental biotechnologies for nitrogen removal from wastewater. However, little is known about the functional role heterotrophic bacteria play in anammox granules. Here, we use genome-centric metagenomics to recover 17 draft genomes of anammox and heterotrophic bacteria from a laboratory-scale anammox bioreactor. We combine metabolic network reconstruction with metatranscriptomics to examine the gene expression of anammox and heterotrophic bacteria and to identify their potential interactions. We find that Chlorobi-affiliated bacteria may be highly active protein degraders, catabolizing extracellular peptides while recycling nitrate to nitrite. Other heterotrophs may also contribute to scavenging of detritus and peptides produced by anammox bacteria, and potentially use alternative electron donors, such as H
2
, acetate and formate. Our findings improve the understanding of metabolic activities and interactions between anammox and heterotrophic bacteria and offer the first transcriptional insights on ecosystem function in anammox granules.
The use of anammox microbiomes to treat wastewater is an escalating biotechnology, yet the functional role heterotrophic bacteria play in these systems remains poorly understood. Here, Lawson
et al
. use metagenomics and metatranscriptomics to reveal that heterotrophs degrade free peptides, while recycling nitrate to nitrite.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 45/23
/ 45/91
/ Ammonium
/ Ammonium Compounds - metabolism
/ Bacteria
/ Denitrification - physiology
/ Detritus
/ Genome, Bacterial - genetics
/ Genomes
/ Heterotrophic Processes - physiology
/ Humanities and Social Sciences
/ Metabolic Networks and Pathways
/ Microbial Interactions - physiology
/ Nitrates
/ Nitrogen
/ Peptides
/ Proteins
/ Science
