Abundances of iron-binding photosynthetic and nitrogen-fixing proteins of Trichodesmium both in culture and in situ from the North Atlantic.

PloS One
Sophie RichierThomas S Bibby

Abstract

Marine cyanobacteria of the genus Trichodesmium occur throughout the oligotrophic tropical and subtropical oceans, where they can dominate the diazotrophic community in regions with high inputs of the trace metal iron (Fe). Iron is necessary for the functionality of enzymes involved in the processes of both photosynthesis and nitrogen fixation. We combined laboratory and field-based quantifications of the absolute concentrations of key enzymes involved in both photosynthesis and nitrogen fixation to determine how Trichodesmium allocates resources to these processes. We determined that protein level responses of Trichodesmium to iron-starvation involve down-regulation of the nitrogen fixation apparatus. In contrast, the photosynthetic apparatus is largely maintained, although re-arrangements do occur, including accumulation of the iron-stress-induced chlorophyll-binding protein IsiA. Data from natural populations of Trichodesmium spp. collected in the North Atlantic demonstrated a protein profile similar to iron-starved Trichodesmium in culture, suggestive of acclimation towards a minimal iron requirement even within an oceanic region receiving a high iron-flux. Estimates of cellular metabolic iron requirements are consistent wi...Continue Reading

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Citations

Dec 25, 2013·Proceedings of the National Academy of Sciences of the United States of America·Christian SchlosserC Mark Moore
Nov 1, 2016·FEMS Microbiology Letters·Elizabeth C SargentThomas S Bibby
Feb 2, 2018·Frontiers in Microbiology·Despo PolyviouThomas S Bibby
Sep 3, 2019·Metallomics : Integrated Biometal Science·Martha GledhillYeala Shaked
Mar 12, 2016·PloS One·Andrés GonzálezMaría F Fillat
Apr 27, 2019·Frontiers in Microbiology·Qian LiNianzhi Jiao
Mar 14, 2020·Scientific Reports·Evangelia LouropoulouAlessandro Tagliabue

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