title: Changes in the LHCI aggregation state during iron repletion in the unicellular red alga Rhodella violacea.
abstract: Red algae are well suited to study the effects of iron deficiency on light-harvesting complex for photosystem I (LHCI), since they are totally devoid of light-harvesting complex for photosystem II (LHCII). Iron starvation results in a reduction of the pigment content, an increase of the fluorescence yield and a new emission band at 705 nm in the 77 K fluorescence emission spectra. These changes reflect the accumulation of uncoupled, aggregated LHCI in iron-depleted cells. Reconnection of LHCI to de novo synthesized reaction center I (RCI) is the first event, which takes place after iron addition. The changes in the aggregation state of LHCI are likely to occur also in brown and green algae.
authors.affiliation: Organismes Photosynthétiques et Environnement, UMR 8543 CNRS, Département de Biologie, ENS 46 rue d'Ulm, 75230 cedex 05, Paris, France
authors.forename: Jean Michel
authors.initials: JM
authors.lastname: Doan
authors.forename: Benoít
authors.initials: B
authors.lastname: Schoefs
authors.forename: Alexander V
authors.initials: AV
authors.lastname: Ruban
authors.forename: Anne Lise
authors.initials: AL
authors.lastname: Etienne
mesh_terms: D007501:Iron / Q000378:metabolism*; D046911:Macromolecular Substances; D010788:Photosynthesis; D045322:Photosynthetic Reaction Center Complex Proteins / Q000737:chemistry* / Q000378:metabolism*; D045331:Photosystem I Protein Complex; D045332:Photosystem II Protein Complex; D000461:Rhodophyta / Q000737:chemistry* / Q000378:metabolism*; D013050:Spectrometry, Fluorescence
chemical_list: D046911:Macromolecular Substances; D045322:Photosynthetic Reaction Center Complex Proteins; D045331:Photosystem I Protein Complex; D045332:Photosystem II Protein Complex; D007501:Iron