Distinct actors drive different mechanisms of biopolymer processing in polar marine coastal sediments.
Journal
Environmental microbiology
ISSN: 1462-2920
Titre abrégé: Environ Microbiol
Pays: England
ID NLM: 100883692
Informations de publication
Date de publication:
Jul 2024
Jul 2024
Historique:
received:
08
05
2024
accepted:
24
07
2024
medline:
22
8
2024
pubmed:
22
8
2024
entrez:
21
8
2024
Statut:
ppublish
Résumé
Heterotrophic bacteria in the ocean initiate biopolymer degradation using extracellular enzymes that yield low molecular weight hydrolysis products in the environment, or by using a selfish uptake mechanism that retains the hydrolysate for the enzyme-producing cell. The mechanism used affects the availability of hydrolysis products to other bacteria, and thus also potentially the composition and activity of the community. In marine systems, these two mechanisms of substrate processing have been studied in the water column, but to date, have not been investigated in sediments. In surface sediments from an Arctic fjord of Svalbard, we investigated mechanisms of biopolymer hydrolysis using four polysaccharides and mucin, a glycoprotein. Extracellular hydrolysis of all biopolymers was rapid. Moreover, rapid degradation of mucin suggests that it may be a key substrate for benthic microbes. Although selfish uptake is common in ocean waters, only a small fraction (0.5%-2%) of microbes adhering to sediments used this mechanism. Selfish uptake was carried out primarily by Planctomycetota and Verrucomicrobiota. The overall dominance of extracellular hydrolysis in sediments, however, suggests that the bulk of biopolymer processing is carried out by a benthic community relying on the sharing of enzymatic capabilities and scavenging of public goods.
Identifiants
pubmed: 39168162
doi: 10.1111/1462-2920.16687
doi:
Substances chimiques
Biopolymers
0
Polysaccharides
0
Mucins
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e16687Subventions
Organisme : Max-Planck-Gesellschaft
Organisme : National Science Foundation
ID : OCE-2022952
Organisme : National Science Foundation
ID : OCE-2241720
Informations de copyright
© 2024 The Author(s). Environmental Microbiology published by John Wiley & Sons Ltd.
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