Microbial rhodopsins are major contributors to the solar energy captured in the sea

Laura Gómez-Consarnau (Lead / Corresponding author), John A. Raven, Naomi M. Levine, Lynda S. Cutter, Deli Wang, Brian Seegers, Javier Arístegui, Jed A. Fuhrman, Josep M. Gasol, Sergio A. Sañudo-Wilhelmy

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    Abstract

    All known phototrophic metabolisms on Earth rely on one of three categories of energy-converting pigments: chlorophyll-a (rarely -d), bacteriochlorophyll-a (rarely -b), and retinal, which is the chromophore in rhodopsins. While the significance of chlorophylls in solar energy capture has been studied for decades, the contribution of retinal-based phototrophy to this process remains largely unexplored. We report the first vertical distributions of the three energy-converting pigments measured along a contrasting nutrient gradient through the Mediterranean Sea and the Atlantic Ocean. The highest rhodopsin concentrations were observed above the deep chlorophyll-a maxima, and their geographical distribution tended to be inversely related to that of chlorophyll-a. We further show that proton-pumping proteorhodopsins potentially absorb as much light energy as chlorophyll-a-based phototrophy and that this energy is sufficient to sustain bacterial basal metabolism. This suggests that proteorhodopsins are a major energy-transducing mechanism to harvest solar energy in the surface ocean.

    Original languageEnglish
    Article numbereaaw8855
    Pages (from-to)1-8
    Number of pages8
    JournalScience Advances
    Volume5
    Issue number8
    DOIs
    Publication statusPublished - 7 Aug 2019

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    Gómez-Consarnau, L., Raven, J. A., Levine, N. M., Cutter, L. S., Wang, D., Seegers, B., Arístegui, J., Fuhrman, J. A., Gasol, J. M., & Sañudo-Wilhelmy, S. A. (2019). Microbial rhodopsins are major contributors to the solar energy captured in the sea. Science Advances, 5(8), 1-8. [eaaw8855]. https://doi.org/10.1126/sciadv.aaw8855