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Dark metabolism: a molecular insight into how the Antarctic sea-ice diatom Fragilariopsis cylindrus survives long-term darkness


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Kennedy, FC ORCID: 0000-0003-1796-0764, Martin, A ORCID: 0000-0001-8260-5529, Bowman, JP ORCID: 0000-0002-4528-9333, Wilson, R ORCID: 0000-0003-0152-4394 and McMinn, A ORCID: 0000-0002-2133-3854 2019 , 'Dark metabolism: a molecular insight into how the Antarctic sea-ice diatom Fragilariopsis cylindrus survives long-term darkness' , New Phytologist , pp. 1-17 , doi: 10.1111/nph.15843.

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Light underneath Antarctic sea‐ice is below detectable limits for up to 4 months of the year. The ability of Antarctic sea‐ice diatoms to survive this prolonged darkness relies on their metabolic capability. This study is the first to examine the proteome of a prominent sea‐ice diatom in response to extended darkness, focusing on the protein‐level mechanisms of dark survival.The Antarctic diatom Fragilariopsis cylindrus was grown under continuous light or darkness for 120 d. The whole cell proteome was quantitatively analysed by nano‐LC−MS/MS to investigate metabolic changes that occur during sustained darkness and during recovery under illumination.Enzymes of metabolic pathways, particularly those involved in respiratory processes, tricarboxylic acid cycle, glycolysis, the Entner−Doudoroff pathway, the urea cycle and the mitochondrial electron transport chain became more abundant in the dark. Within the plastid, carbon fixation halted while the upper sections of the glycolysis, gluconeogenesis and pentose phosphate pathways became less active.We have discovered how F. cylindrus utilises an ancient alternative metabolic mechanism that enables its capacity for long‐term dark survival. By sustaining essential metabolic processes in the dark, F. cylindrus retains the functionality of the photosynthetic apparatus, ensuring rapid recovery upon re‐illumination.

Item Type: Article
Authors/Creators:Kennedy, FC and Martin, A and Bowman, JP and Wilson, R and McMinn, A
Keywords: Antarctic, dark survival, Fragilariopsis cylindrus, metabolism, proteomics, sea-ice algae
Journal or Publication Title: New Phytologist
Publisher: Blackwell Publishing Ltd
ISSN: 0028-646X
DOI / ID Number: 10.1111/nph.15843
Copyright Information:

Copyright 2019 The AuthorsLicensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

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