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Structural Characterization of Mannan Cell Wall Polysaccharides in Plants Using PACE
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Alpha- and beta-mannan utilization by marine Bacteroidetes.

Jing Chen1,2,3,4, Craig S Robb1,5, Frank Unfried6,7

  • 1Max Planck Institute for Marine Microbiology, Bremen, Germany.

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Marine bacteria degrade algal mannans using specialized gene clusters, revealing their crucial role in the marine carbon cycle. These findings highlight conserved microbial strategies for nutrient cycling across diverse environments.

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Area of Science:

  • Marine microbiology
  • Biogeochemical cycles
  • Enzymology

Background:

  • Marine microscopic algae are key global carbon fixers, producing organic matter utilized by marine microbes.
  • Bacteroidetes bacteria degrade algal polysaccharides using carbohydrate-active enzymes (CAZymes) encoded in polysaccharide utilization loci (PULs).
  • Specific algal polysaccharide substrates targeted by marine bacteria remain largely unidentified.

Purpose of the Study:

  • To investigate the function of putative mannan-specific PULs in four marine Bacteroidetes species from the southern North Sea.
  • To determine if these marine bacteria can degrade algal mannans.
  • To understand the role of algal mannans in the marine carbon cycle.

Main Methods:

  • Isolation and cultivation of marine Bacteroidetes.
  • Genomic analysis to identify mannan-specific PULs.
  • Proteomic analysis to identify expressed proteins.
  • Growth experiments using polysaccharides as sole carbon sources.

Main Results:

  • Four marine Bacteroidetes strains possessing PULs predicted to be mannan-specific were identified.
  • These bacteria successfully expressed functional proteins enabling the degradation of both α- and β-mannans.
  • Growth experiments confirmed the utilization of mannans as primary carbon sources.

Conclusions:

  • Marine algal mannans represent a significant, previously unrecognized component of the marine carbon cycle.
  • Biochemical mechanisms for polysaccharide degradation, exemplified by PULs, are conserved across evolutionarily distant bacteria.
  • This study bridges understanding between gut/terrestrial and marine microbial degradation pathways.