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Comparative proteomics of related symbiotic mussel species reveals high variability of host-symbiont interactions

TitleComparative proteomics of related symbiotic mussel species reveals high variability of host-symbiont interactions
Publication TypeJournal Article
Year of Publication2020
AuthorsPonnudurai R., Heiden S.E, Sayavedra L., Hinzke T., Kleiner M., Hentschker C., Felbeck H., Sievert S.M, Schluter R., Becher D., Schweder T., Markert S.
Date Published2020/02
Type of ArticleArticle
ISBN Number1751-7362
Accession NumberWOS:000509197100026
Keywordsbacteria; bathymodiolus-azoricus; Bivalvia; carbonic-anhydrase; Environmental Sciences & Ecology; hydrogen; hydrothermal vents; metabolism; microbiology; mid-atlantic ridge; mytilidae; populations

Deep-sea Bathymodiolus mussels and their chemoautotrophic symbionts are well-studied representatives of mutualistic host-microbe associations. However, how host-symbiont interactions vary on the molecular level between related host and symbiont species remains unclear. Therefore, we compared the host and symbiont metaproteomes of Pacific B. thermophilus, hosting a thiotrophic symbiont, and Atlantic B. azoricus, containing two symbionts, a thiotroph and a methanotroph. We identified common strategies of metabolic support between hosts and symbionts, such as the oxidation of sulfide by the host, which provides a thiosulfate reservoir for the thiotrophic symbionts, and a cycling mechanism that could supply the host with symbiont-derived amino acids. However, expression levels of these processes differed substantially between both symbioses. Backed up by genomic comparisons, our results furthermore revealed an exceptionally large repertoire of attachment-related proteins in the B. thermophilus symbiont. These findings imply that host-microbe interactions can be quite variable, even between closely related systems.

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