A proton pump enhancing photosynthesis links phagocytosis to marine phytoplankton symbiogenesis

The chloroplasts of most marine eukaryotic phytoplankton are surrounded by intracellular membranes derived from ancestral secondary endosymbiotic events between heterotrophic unicellular eukaryotes and red microalgae. We report that the proton-pumping enzyme V-type H+-ATPase (VHA), ubiquitously used in eukaryotic intercellular digestion, is localized around chloroplasts of centric diatoms where VHA-activity significantly enhances photosynthesis over the full range of oceanic irradiances. Similar results in pennate diatoms, dinoflagellates, and coccolithophorids, but not green or red microalgae, imply a shared VHA-dependent mechanism in secondary endosymbiotic phytoplankton that enhances photosynthesis and conservatively contributes 7% of primary production in the ocean. Analogous VHA-dependent mechanisms in extant photosymbiotic marine invertebrates provide evidence for an adaptive advantage throughout the transition from endosymbiosis to symbiogenesis. One-Sentence Summary Stimulation of photosynthesis by a conserved proton pump provides a functional link between food digestion and symbiogenesis

• Publication year

  2022

• Venue

  bioRxiv

• Publication date

  2022-05-28

• Fields of study

  Biology, Environmental Science

• Identifiers
  DOI 10.1101/2022.05.26.493626
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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