Cooccurring Activities of Two Autotrophic Pathways in Symbionts of the Hydrothermal Vent Tubeworm Riftia pachyptila.

ABSTRACT: Genome and proteome data predict the presence of both the reductive citric acid cycle (rCAC; also called the reductive tricarboxylic acid cycle) and the Calvin-Benson-Bassham cycle (CBB) in "Candidatus Endoriftia persephonae," the autotrophic sulfur-oxidizing bacterial endosymbiont from the giant hydrothermal vent tubeworm Riftia pachyptila. We tested whether these cycles were differentially induced by sulfide supply, since the synthesis of biosynthetic intermediates by the rCAC is less energetically expensive than that by the CBB. R. pachyptila was incubated under in situ conditions in high-pressure aquaria under low (28 to 40 μmol · h^-1) or high (180 to 276 μmol · h^-1) rates of sulfide supply. Symbiont-bearing trophosome samples excised from R. pach

SUBMITTER: Leonard JM 

PROVIDER: S-EPMC8357282 | biostudies-literature | 2021 Aug

REPOSITORIES: biostudies-literature