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

Autor: Gómez-Consarnau L; Departamento de Oceanografía Biológica, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), 22860 Ensenada, Baja California, México.; Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA., Raven JA; Division of Plant Science, University of Dundee at the James Hutton Institute, Invergowrie, Dundee DD2 5DA, UK.; Climate Change Cluster, University of Technology Sydney, Ultimo, NSW 2007, Australia.; School of Biological Sciences, University of Western Australia, 25 Stirling Highway, Crawley, WA 6009, Australia., Levine NM; Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA., Cutter LS; Department of Earth Science, University of Southern California, Los Angeles, CA 90089, USA., Wang D; State Key Laboratory of Marine Environmental Science, Xiamen University, 422 Siming Nanlu, 361005 Xiamen, China., Seegers B; The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA., Arístegui J; Instituto de Oceanografía y Cambio Global (IOCAG), Universidad de Las Palmas de Gran Canaria, 35017 Las Palmas de Gran Canaria, Spain., Fuhrman JA; Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA., Gasol JM; Institut de Ciències del Mar-CSIC, ES-08003 Barcelona, Catalonia, Spain.; Centre for Marine Ecosystems Research, School of Science, Edith Cowan University, Joondalup, WA, Australia., Sañudo-Wilhelmy SA; Department of Earth Science, University of Southern California, Los Angeles, CA 90089, USA.
Jazyk: angličtina
Zdroj: Science advances [Sci Adv] 2019 Aug 07; Vol. 5 (8), pp. eaaw8855. Date of Electronic Publication: 2019 Aug 07 (Print Publication: 2019).
DOI: 10.1126/sciadv.aaw8855
Abstrakt: 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.
Databáze: MEDLINE