title: Arabidopsis STN7 kinase provides a link between short- and long-term photosynthetic acclimation.
abstract: Flowering plants control energy allocation to their photosystems in response to light quality changes. This includes the phosphorylation and migration of light-harvesting complex II (LHCII) proteins (state transitions or short-term response) as well as long-term alterations in thylakoid composition (long-term response or LTR). Both responses require the thylakoid protein kinase STN7. Here, we show that the signaling pathways triggering state transitions and LTR diverge at, or immediately downstream from, STN7. Both responses require STN7 activity that can be regulated according to the plastoquinone pool redox state. However, LTR signaling does not involve LHCII phosphorylation or any other state transition step. State transitions appear to play a prominent role in flowering plants, and the ability to perform state transitions becomes critical for photosynthesis in Arabidopsis thaliana mutants that are impaired in thylakoid electron transport but retain a functional LTR. Our data imply that STN7-dependent phosphorylation of an as yet unknown thylakoid protein triggers LTR signaling events, whereby an involvement of the TSP9 protein in the signaling pathway could be excluded. The LTR signaling events then ultimately regulate in chloroplasts the expression of photosynthesis-related genes on the transcript level, whereas expression of nuclear-encoded proteins is regulated at multiple levels, as indicated by transcript and protein profiling in LTR mutants.
authors.affiliation: Dipartimento di Produzione Vegetale, Università degli studi di Milano c/o Parco Tecnologico Padano Via Einstein, 26900 Lodi, Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: Pesaresi
authors.forename: Alexander
authors.initials: A
authors.lastname: Hertle
authors.forename: Mathias
authors.initials: M
authors.lastname: Pribil
authors.forename: Tatjana
authors.initials: T
authors.lastname: Kleine
authors.forename: Raik
authors.initials: R
authors.lastname: Wagner
authors.forename: Henning
authors.initials: H
authors.lastname: Strissel
authors.forename: Anna
authors.initials: A
authors.lastname: Ihnatowicz
authors.forename: Vera
authors.initials: V
authors.lastname: Bonardi
authors.forename: Michael
authors.initials: M
authors.lastname: Scharfenberg
authors.forename: Anja
authors.initials: A
authors.lastname: Schneider
authors.forename: Thomas
authors.initials: T
authors.lastname: Pfannschmidt
authors.forename: Dario
authors.initials: D
authors.lastname: Leister
mesh_terms: D017360:Arabidopsis / Q000201:enzymology* / Q000235:genetics / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D004579:Electron Transport / Q000502:physiology; D018506:Gene Expression Regulation, Plant / Q000235:genetics / Q000528:radiation effects; D015151:Immunoblotting; D008027:Light; D013058:Mass Spectrometry; D008954:Models, Biological; D020411:Oligonucleotide Array Sequence Analysis; D010766:Phosphorylation / Q000502:physiology; D010788:Photosynthesis / Q000235:genetics / Q000502:physiology*; D011494:Protein Kinases / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D017346:Protein Serine-Threonine Kinases; D015398:Signal Transduction / Q000235:genetics / Q000528:radiation effects; D020524:Thylakoids / Q000201:enzymology / Q000235:genetics / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; D011494:Protein Kinases; D017346:Protein Serine-Threonine Kinases; C497212:STN7 protein, Arabidopsis
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