Loss of ALBINO3b insertase results in a truncated light-harvesting antenna in diatoms.

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ID: 27244
2019
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Abstract
The family of chloroplast ALBINO3 (ALB3) proteins function in the insertion and assembly of thylakoid membrane protein complexes. Loss of ALB3b in the marine diatom Phaeodactylum tricornutum leads to a striking change of cell color from the normal brown to green. A 75% decrease of the main fucoxanthin-chlorophyll a/c-binding proteins was identified in the alb3b strains as the cause of changes in the spectral properties of the mutant cells. The alb3b lines exhibit a truncated light-harvesting antenna phenotype with reduced amounts of light-harvesting pigments and require a higher light intensity for saturation of photosynthesis. Accumulation of photoprotective pigments and LHCX proteins were not negatively affected in the mutant strains, but still the capacity for non-photochemical quenching was lower compared to wild type. In plants and green algae, ALB3 proteins interact with members of the chloroplast signal recognition particle pathway through a lysine-rich C-terminal domain. A novel conserved C-terminal domain was identified in diatoms and other stramenopiles, questioning if ALB3b proteins have the same interaction partners as their plant/green algae homologs.
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nymark2019lossplant Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Nymark, Marianne;Volpe, Charlotte;Hafskjold, Marthe Cg;Kirst, Henning;Serif, Manuel;Vadstein, Olav;Bones, Atle M;Melis, Anastasios;Winge, Per;
Journal Plant physiology
Year 2019
DOI
pp.00868.2019
URL
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