Marine Bacteroidetes enzymatically digest xylans from terrestrial plants.
Journal
Environmental microbiology
ISSN: 1462-2920
Titre abrégé: Environ Microbiol
Pays: England
ID NLM: 100883692
Informations de publication
Date de publication:
09 2023
09 2023
Historique:
received:
23
09
2022
accepted:
18
04
2023
medline:
23
10
2023
pubmed:
1
5
2023
entrez:
30
4
2023
Statut:
ppublish
Résumé
Marine Bacteroidetes that degrade polysaccharides contribute to carbon cycling in the ocean. Organic matter, including glycans from terrestrial plants, might enter the oceans through rivers. Whether marine bacteria degrade structurally related glycans from diverse sources including terrestrial plants and marine algae was previously unknown. We show that the marine bacterium Flavimarina sp. Hel_I_48 encodes two polysaccharide utilization loci (PULs) which degrade xylans from terrestrial plants and marine algae. Biochemical experiments revealed activity and specificity of the encoded xylanases and associated enzymes of these PULs. Proteomics indicated that these genomic regions respond to glucuronoxylans and arabinoxylans. Substrate specificities of key enzymes suggest dedicated metabolic pathways for xylan utilization. Some of the xylanases were active on different xylans with the conserved β-1,4-linked xylose main chain. Enzyme activity was consistent with growth curves showing Flavimarina sp. Hel_I_48 uses structurally different xylans. The observed abundance of related xylan-degrading enzyme repertoires in genomes of other marine Bacteroidetes indicates similar activities are common in the ocean. The here presented data show that certain marine bacteria are genetically and biochemically variable enough to access parts of structurally diverse xylans from terrestrial plants as well as from marine algal sources.
Identifiants
pubmed: 37121608
doi: 10.1111/1462-2920.16390
doi:
Substances chimiques
Xylans
0
Polysaccharides
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1713-1727Informations de copyright
© 2023 The Authors. Environmental Microbiology published by Applied Microbiology International and John Wiley & Sons Ltd.
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