title: Lil3 Assembles with Proteins Regulating Chlorophyll Synthesis in Barley.
abstract: The light-harvesting-like (LIL) proteins are a family of membrane proteins that share a chlorophyll a/b-binding motif with the major light-harvesting antenna proteins of oxygenic photoautotrophs. LIL proteins have been associated with the regulation of tetrapyrrol biosynthesis, and plant responses to light-stress. Here, it was found in a native PAGE approach that chlorophyllide, and chlorophyllide plus geranylgeraniolpyrophosphate trigger assembly of Lil3 in three chlorine binding fluorescent protein bands, termed F1, F2, and F3. It is shown that light and chlorophyllide trigger accumulation of protochlorophyllide-oxidoreductase, and chlorophyll synthase in band F3. Chlorophyllide and chlorophyll esterified to geranylgeraniol were identified as basis of fluorescence recorded from band F3. A direct interaction between Lil3, CHS and POR was confirmed in a split ubiquitin assay. In the presence of light or chlorophyllide, geranylgeraniolpyrophosphate was shown to trigger a loss of the F3 band and accumulation of Lil3 and geranylgeranyl reductase in F1 and F2. No direct interaction between Lil3 and geranylgeraniolreductase was identified in a split ubiquitin assay; however, accumulation of chlorophyll esterified to phytol in F1 and F2 corroborated the enzymes assembly. Chlorophyll esterified to phytol and the reaction center protein psbD of photosystem II were identified to accumulate together with psb29, and APX in the fluorescent band F2. Data show that Lil3 assembles with proteins regulating chlorophyll synthesis in etioplasts from barley (Hordeum vulgare L.).
authors.affiliation: Center for Organelle Research, University of Stavanger, Stavanger, Norway.
authors.forename: Astrid
authors.initials: A
authors.lastname: Mork-Jansson
authors.affiliation: Center for Organelle Research, University of Stavanger, Stavanger, Norway.
authors.forename: Ann Kristin
authors.initials: AK
authors.lastname: Bue
authors.affiliation: Center for Organelle Research, University of Stavanger, Stavanger, Norway.
authors.forename: Daniela
authors.initials: D
authors.lastname: Gargano
authors.affiliation: Center for Organelle Research, University of Stavanger, Stavanger, Norway.
authors.forename: Clemens
authors.initials: C
authors.lastname: Furnes
authors.affiliation: Center for Organelle Research, University of Stavanger, Stavanger, Norway.
authors.forename: Veronika
authors.initials: V
authors.lastname: Reisinger
authors.affiliation: Center for Organelle Research, University of Stavanger, Stavanger, Norway.
authors.forename: Janine
authors.initials: J
authors.lastname: Arnold
authors.affiliation: Center for Organelle Research, University of Stavanger, Stavanger, Norway.
authors.forename: Karol
authors.initials: K
authors.lastname: Kmiec
authors.affiliation: Center for Organelle Research, University of Stavanger, Stavanger, Norway.
authors.forename: Lutz Andreas
authors.initials: LA
authors.lastname: Eichacker
mesh_terms: D002734:Chlorophyll / Q000378:metabolism*; D000077194:Chlorophyll A; D002736:Chloroplasts / Q000378:metabolism; D001467:Hordeum / Q000378:metabolism*; D008027:Light; D045342:Light-Harvesting Protein Complexes / Q000378:metabolism*; D010088:Oxidoreductases / Q000378:metabolism; D045332:Photosystem II Protein Complex / Q000378:metabolism; D010836:Phytol / Q000378:metabolism; D011485:Protein Binding / Q000502:physiology
chemical_list: D045342:Light-Harvesting Protein Complexes; D045332:Photosystem II Protein Complex; D002734:Chlorophyll; D010836:Phytol; C037184:chlorophyll b; D010088:Oxidoreductases; C110920:geranylgeranyl reductase; D000077194:Chlorophyll A