Alpha-glucans from bacterial necromass indicate an intra-population loop within the marine carbon cycle

Author:

Beidler Irena1,Steinke Nicola2,Schulze Tim3,Sidhu Chandni4,Bartosik Daniel3,Krull Joris5,Dutschei Theresa6,Ferrero-Bordera Borja3,Rielicke Julia3,Kale Vaikhari3,Sura Thomas7,Trautwein-Schult Anke7,Kirstein Inga8,Wiltshire Karen8,Teeling Hanno4ORCID,Becher Dörte1ORCID,Bengtsson Mia1ORCID,Hehemann Jan-Hendrik2ORCID,Bornscheuer Uwe9ORCID,Amann Rudolf10ORCID,Schweder Thomas1ORCID

Affiliation:

1. University of Greifswald

2. University of Bremen

3. University Greifswald

4. Max Planck Institute for Marine Microbiology

5. University Bremen

6. Universty Greifswald

7. Ernst-Moritz-Arndt-University Greifswald

8. Biologische Anstalt Helgoland

9. Institute of Biochemistry

10. Max-Planck-Institut for Marine Microbiology

Abstract

Abstract Phytoplankton blooms initiate bacterioplankton blooms, from which bacterial biomass is released via grazing zooplankton and viral lysis. Bacterial consumption of algal biomass during blooms is well studied, but little is known about the simultaneous reuse of bacterial necromass. Alpha- and beta-glucans are abundant dissolved organic macromolecules during blooms. We demonstrate algal laminarin-fueled alpha-glucan synthesis in marine Bacteroidota strains, as well as bacterial reuse of these alpha-glucans as major carbon source in vitro and during a diatom-dominated bloom. We highlight two types of genomic loci and the encoded protein machineries with structurally distinct SusD substrate-binding proteins that may target alpha-glucans of different complexities. It is demonstrated that these encoded machineries can be specifically induced by extracted alpha-glucan-rich bacterial polysaccharides. This bacterial alpha-glucan synthesis and recycling from bacterial necromass constitutes a large-scale intra-population energy conservation mechanism redirecting substantial amounts of carbon in an essential part of the microbial loop.

Publisher

Research Square Platform LLC

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4. Becker, S. et al. Laminarin is a major molecule in the marine carbon cycle. Proc. Natl. Acad. Sci. USA 117, 6599–6607 (2020).

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