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  • Title: Leptosphaeria rhodopsin: bacteriorhodopsin-like proton pump from a eukaryote.
    Author: Waschuk SA, Bezerra AG, Shi L, Brown LS.
    Journal: Proc Natl Acad Sci U S A; 2005 May 10; 102(19):6879-83. PubMed ID: 15860584.
    Abstract:
    Bacteriorhodopsin-like proteins provide archaea and eubacteria with a unique bioenergetic pathway comprising light-driven transmembrane proton translocation by a single retinal-binding protein. Recently, homologous proteins were found to perform photosensory functions in lower eukaryotes, but no active ion transport by eukaryotic rhodopsins was detected. By demonstrating light-driven proton pumping in a fungal rhodopsin from Leptosphaeria maculans, we present a case of a retinal-based proton transporter from a eukaryote. This result implies that in addition to oxidative phosphorylation and chlorophyll photosynthesis, some lower eukaryotes may have retained the archaeal route of building an electrochemical transmembrane gradient of protons.
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