Journal Article

PUBDB-2024-00420

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Plastid-localized xanthorhodopsin increases diatom biomass and ecosystem productivity in iron-limited surface oceans

Strauss, J. (Corresponding author)CSSB* ; Deng, L. ; Gao, S. ; Toseland, A. ; Bachy, C. ; Zhang, C. ; Kirkham, A. ; Hopes, A. ; Utting, R. ; Joest, E. F. ; Tagliabue, A. ; Loew, C.CSSB* ; Worden, A. Z. ; Nagel, G. ; Mock, T. (Corresponding author)

2023
Nature Publishing Group London

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Please use a persistent id in citations: doi:10.1038/s41564-023-01498-5  doi:10.3204/PUBDB-2024-00420

Abstract: Microbial rhodopsins are photoreceptor proteins that convert light into biological signals or energy. Proteins of the xanthorhodopsin family are common in eukaryotic photosynthetic plankton including diatoms. However, their biological role in these organisms remains elusive. Here we report on a xanthorhodopsin variant (FcR1) isolated from the polar diatom Fragilariopsis cylindrus. Applying a combination of biophysical, biochemical and reverse genetics approaches, we demonstrate that FcR1 is a plastid-localized proton pump which binds the chromophore retinal and is activated by green light. Enhanced growth of a Thalassiora pseudonana gain-of-function mutant expressing FcR1 under iron limitation shows that the xanthorhodopsin proton pump supports growth when chlorophyll-based photosynthesis is iron-limited. The abundance of xanthorhodopsin transcripts in natural diatom communities of the surface oceans is anticorrelated with the availability of dissolved iron. Thus, we propose that these proton pumps convey a fitness advantage in regions where phytoplankton growth is limited by the availability of dissolved iron.

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Contributing Institute(s):

1. CSSB-EMBL-CL (CSSB-EMBL-CL)

Research Program(s):

1. 899 - ohne Topic (POF4-899) (POF4-899)

Experiment(s):

1. No specific instrument

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Database coverage:
; ; ; BIOSIS Previews ; Biological Abstracts ; Clarivate Analytics Master Journal List ; DEAL Nature ; Essential Science Indicators ; IF >= 25 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection ; Zoological Record

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