Energy transfer in ubiquitous rhodopsin pumps with xanthophyll antennas

Author:

Chazan ArielORCID,Das IshitaORCID,Fujiwara Takayoshi,Murakoshi ShunyaORCID,Shihoya WataruORCID,Rozenberg AndreyORCID,Molina-Márquez AnaORCID,Larom ShirleyORCID,Pushkarev AlinaORCID,Malakar ParthaORCID,Ruhman SanfordORCID,Hasegawa Masumi,Tsukamoto Yuya,Ishizuka TomohiroORCID,Konno MasaeORCID,Nagata TakashiORCID,Inoue KeiichiORCID,Mizuno Yosuke,Katayama KotaORCID,Abe-Yoshizumi Rei,Kandori HidekiORCID,León Rosa M.ORCID,Yoshizawa SusumuORCID,Sheves MordechaiORCID,Nureki OsamuORCID,Béjà OdedORCID

Abstract

AbstractEnergy transfer from light-harvesting ketocarotenoids to light-driven proton pumps xanthorhodopsins has been previously demonstrated in two unique cases: an extreme halophilic bacterium1 and a terrestrial cyanobacterium2. Attempts to find carotenoids that bind and transfer energy to rhodopsin proton pumps from the abundant marine and freshwater photoheterotrophs have thus far failed3–5. Here, using functional metagenomics combined with chromophore extraction from the environment, we detected light energy transfer from the widespread hydroxylated carotenoids zeaxanthin and lutein to the retinal moiety of xanthorhodopsins and proteorhodopsins. The light-harvesting carotenoids transfer up to 42% of the harvested energy in the violet/blue-light range to the green-light absorbing retinal chromophore. Our data suggest that these antennas have a significant impact on rhodopsin phototrophy in the world’s lakes, seas and oceans.

Publisher

Cold Spring Harbor Laboratory

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