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In marine Bacteroidetes the bulk of glycan degradation during algae blooms is mediated by few clades using a restricted set of genes
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In marine Bacteroidetes the bulk of glycan degradation during algae blooms is mediated by few clades using a restricted set of genes
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Journal Article
In marine Bacteroidetes the bulk of glycan degradation during algae blooms is mediated by few clades using a restricted set of genes
2019
Overview
We investigated
Bacteroidetes
during spring algae blooms in the southern North Sea in 2010–2012 using a time series of 38 deeply sequenced metagenomes. Initial partitioning yielded 6455 bins, from which we extracted 3101 metagenome-assembled genomes (MAGs) including 1286
Bacteroidetes
MAGs covering ~120 mostly uncultivated species. We identified 13 dominant, recurrent
Bacteroidetes
clades carrying a restricted set of conserved polysaccharide utilization loci (PULs) that likely mediate the bulk of bacteroidetal algal polysaccharide degradation. The majority of PULs were predicted to target the diatom storage polysaccharide laminarin, alpha-glucans, alpha-mannose-rich substrates, and sulfated xylans. Metaproteomics at 14 selected points in time revealed expression of SusC-like proteins from PULs targeting all of these substrates. Analyses of abundant key players and their PUL repertoires over time furthermore suggested that fewer and simpler polysaccharides dominated early bloom stages, and that more complex polysaccharides became available as blooms progressed.
Publisher
Nature Publishing Group UK,Oxford University Press,Nature Publishing Group
Subject
/ 82/80
/ Algae
/ Bacterial Proteins - genetics
/ Bacterial Proteins - metabolism
/ Bacteroidetes - classification
/ Biomedical and Life Sciences
/ Diatoms - growth & development
/ Ecology
/ Environmental Sciences & Ecology
/ Genomes
/ Glucans
/ Glycan
/ Mannose
/ Microbial Genetics and Genomics
