Proteomics

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Proteomics of Ca. Riegeria standrea – the chemosynthetic symbionts of the marine flatworm Paracatenula from the Bay of Sant´Andrea (Elba, Italy)


ABSTRACT: Paracatenula are marine catenulid flatworms occuring in shallow water sediments. Adult Paracatenula lack a mouth and a digestive system. Instead, a trophosome containing intracellular alphaproteobacterial symbionts, namely Ca. Riegeria fill most of the worm´s body (Gruber-Vodicka et al., 2011). Paracatenula sp. ‘standrea’ that harbor Ca. Riegeria sp. 812A (standrea) were sampled in Elba, Italy in April 2016. Based on the genome of Ca. Riegeria sp. 812A (standrea) we discovered a versatile combination of storage and biosynthesis and a convergence with unrelated intracellular thiotrophic symbionts. Proteomic analyses were performed to investigate which symbiont genes related to the host nutrition were expressed.

INSTRUMENT(S): Q Exactive

ORGANISM(S): Paracatenula Sp. 'standrea' Elba Candidatus Riegeria

TISSUE(S): Whole Body

SUBMITTER: Manuel Kleiner  

LAB HEAD: Harald Gruber-Vodicka

PROVIDER: PXD009856 | Pride | 2019-03-26

REPOSITORIES: Pride

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Publications

Chemosynthetic symbiont with a drastically reduced genome serves as primary energy storage in the marine flatworm <i>Paracatenula</i>.

Jäckle Oliver O   Seah Brandon K B BKB   Tietjen Målin M   Leisch Nikolaus N   Liebeke Manuel M   Kleiner Manuel M   Berg Jasmine S JS   Gruber-Vodicka Harald R HR  

Proceedings of the National Academy of Sciences of the United States of America 20190408 17


Hosts of chemoautotrophic bacteria typically have much higher biomass than their symbionts and consume symbiont cells for nutrition. In contrast to this, chemoautotrophic <i>Candidatus</i> Riegeria symbionts in mouthless <i>Paracatenula</i> flatworms comprise up to half of the biomass of the consortium. Each species of <i>Paracatenula</i> harbors a specific <i>Ca</i> Riegeria, and the endosymbionts have been vertically transmitted for at least 500 million years. Such prolonged strict vertical tr  ...[more]

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