Plant Biology Abstracts Annual Meeting Seville 2019 Animal,Plant & Cell Abstract 226 Annual Meeting Seville 2019 Animal,Plant & Cell Abstract 227
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ABSTRACTS 3 PLANT BIOLOGY ANNUAL MEETING SEVILLE 2019 ANIMAL,PLANT & CELL ABSTRACT 226 ANNUAL MEETING SEVILLE 2019 ANIMAL,PLANT & CELL ABSTRACT 227 t he a mou nt of e xc itat ion ene rg y d i rec ted to t he photosystem s a re P1 REDOX REGULATION P1.3 NEWS ON CP12: USING t he state t ra nsit ions. Du r i ng state t ra nsit ions, t he mobi le l ight- CYANOBACTERIA TO HELP US harvesting trimers (L-LHCII) change their association with the IN CHLOROPLASTS UNDERSTAND ITS ROLE IN photosystems according to phosphorylation status. Phosphorylated L -L HC I I i s a ssoc iated w it h PSI, t hu s d i rec t i ng more e xc itat ion e ne rg y PHOTOSYNTHESIS to PSI, while the dephosphorylated form of L-LHCII is associated w it h PSI I con seque nt ly d i rec t i ng more e xc itat ion e ne rg y to PSI I. TUESDAY 2 JULY, 2019 10:00 To date, protein phosphorylation is the only post-translational modification linked to the regulation of state transitions. PATRICIA E LOPEZ-CALCAGNO (UNIVERSITY OF ESSEX, In the present study we show that the NUCLEAR SHUTTLE ORGANISED BY: ANGEL MERIDA (CSIC SPAIN), MARIAM SAHRAWY (CSIC SPAIN) UNITED KINGDOM), CHRISTINE A RAINES (UNIVERSITY I N T E R AC T I NG ( NSI ) protei n i s a n ac t ive lysi ne acet ylt ra n sfe ra se AND ANTONIO SERRATO (CSIC SPAIN) OF ESSEX, UNITED KINGDOM) and is required for state transitions in Arabidopsis thaliana. Intriguingly, the nsi knock-out plants were unable to perform state [email protected] transitions, although although LHCII phosphorylation remained u na ffec ted . Blue nat ive gel elec t rophoresi s revea led t hat despite MECHANISMS OF PROTEIN SYSTEMS AND SYNTHETIC Improving rates of photosynthetic carbon acquisition is an wild type accumulation of photosynthetic protein complexes, the nsi P1.1 P1.2 important target for increasing the potential yield of major plants fail to accumulate the phosphorylation dependent PSI-LHCII DITHIOL-BASED REDOX REGULATION. BIOLOGY OF REDOX REGULATION crop species and promote food security. Recent research has complex. Accordingly, chlorophyll fluorescence measurements A STRUCTURAL BIOLOGY APPROACH AND CARBON FIXATION demonstrated plants with greater biomass accumulation through showed a dec rea se i n t he a mou nt of e xc itat ion ene rg y d i rec ted to more efficient conversion of sola r energ y to suga rs. W h i le t hese PSI. Additionally, proteomic analysis revealed several acetylation TUESDAY 2 JULY, 2019 09:00 TUESDAY 2 JULY, 2019 09:30 studies have focussed on a number of processes including NPQ targets of NSI that could be involved in state transitions. Our results dynamics, Calvin cycle performance and photorespiration, strongly suggest that NSI is a novel player required for the dynamic MÓNICA BALSERA (INSTITUTO DE RECURSOS NATURALES Y STÉPHANE LEMAIRE (CNRS, SORBONNE UNIVERSITÉ, FRANCE) the manipulation of the redox regulation of photosynthesis adaptation of plants to changing light conditions. AGROBIOLOGÍA DE SALAMANCA) for yield improvement remains a relatively unexploited field. [email protected] We will discuss some advances in this subject, focusing on the [email protected] chloroplast protein family CP12. These proteins are best known for Redox regulation and signaling play a major role in numerous modulating the activity of the Calvin cycle enzymes glyceraldehyde P1.5 REDOX CONTROL OF CHLOROPHYLL During evolution, oxyphotosynthetic organisms have developed fundamental cell processes and participate in the mechanisms 3-phosphate dehydrogenase (GAPDH) and phosphoribulokinase BIOSYNTHESIS sophisticated networks of redox signaling and modulation to allowing cells to sense environmental changes and trigger (PRK), and we recently demonstrated in Arabidopsis, that CP12 regulate cell processes in response to both light and oxygen. Because adaptive responses. These regulations and signaling pathways is essential in maintaining PRK protein levels, and by doing so, of their unique physico-chemical properties, reversible chemical are mainly operated by redox post-translational modifications, such maintaining photosynthesis. While higher plants have a limited TUESDAY 2 JULY, 2019 10:30 modification of thiols in cysteine (Cys) amino acids have acquired as disulfide bond formation, glutathionylation or nitrosylation, variety of CP12 proteins and CP12-like proteins, homologues a prominent role as redox-sensitive thiols can act as redox switches which play a major role at the interface between the environment found in cyanobacteria have revealed a much wider a diversity. BERNHARD GRIMM (HUMBOLDT-UNIVERSITÄT ZU BERLIN, for the control and modulation of the function of proteins. Proteins and the functional proteome. Using qualitative and quantitative We will discuss the importance of CP12 to these organisms, and GERMANY), DANIEL WITTMANN WITTMANN (HUMBOLDT- w it h reg u lator y C ys a re ta rget s of t h iol- ox idoreduc ta ses, suc h a s large scale proteomic approaches in Chlamydomonas reinhardtii, whet he r some of C P12’s i mpor ta nce i n ma i nta i n i ng PR K protei n UNIVERSITÄT ZU BERLIN, GERMANY), NEHA SINHA (HUMBOLDT- the thioredoxin system, which is capable of reducing disulfides we have unraveled an intricate redox network of more than 1000 levels is conserved in the cyanobacteria Synechocystis sp. PCC UNIVERSITÄT ZU BERLIN, GERMANY), ZHIWEI HOU (HUMBOLDT- i n protei n s con nec t i ng t he redox stat u s of e n z y mes to c ha ng i ng proteins regulated by redox post-translational modifications. 6803. Additionally, we will discuss the potential of exploiting these UNIVERSITÄT ZU BERLIN, GERMANY) cellular and environmental conditions. We plan to provide structural The Calvin-Benson cycle, responsible for photosynthetic carbon mechanisms for improving photosynthesis. insights into diverse mechanisms of the regulatory network based fixation, integrates multiple redox signals. Targeted biochemical [email protected] on dithiol/disulfide exchange reactions in oxygenic photosynthesis. a nd st r uc t u ra l st ud ies a l lowed to con fi r m t he reg u lat ion of seve ra l Plants effectively coordinate the photosynthesis dependent proteins and to analyze the underlying molecular mechanisms. production of energy and reducing equivalents with the activity Sy nt het ic biolog y approac hes developed to st udy ca rbon fi xat ion P1.4 PROTEIN ACETYLATION BY of metabolic pathways. As the redox state of chloroplasts changes in Chlamydomonas will also be presented. CHLOROPLAST ACETYLTRANSFERASE NSI in dependency to photosynthesis activities, it is proposed that the IS NEEDED FOR STATE TRANSITIONS IN light-dependent activation of chlorophyll biosynthesis as well as the ARABIDOPSIS THALIANA dark suppression of 5-aminolevulinic acid (ALA) synthesis is coupled w it h redox cont rol v ia mod i ficat ion of t h iol g roups of cont r ibut i ng enzymes. Thus, this posttranslational control mechanism balances TUESDAY 2 JULY, 2019 10:15 chlorophyll biosynthesis in response to environmental cues and prevents accumulation of photoreactive tetrapyrrole metabolites. AISTE IVANAUSKAITE (UNIVERSITY OF TURKU, FINLAND), We previously identified several enzymes of this pathway to be MINNA M KOSKELA (UNIVERSITY OF TURKU, FINLAND), targets of the reversible thiol-disulfide redox regulation by the ANNIKA BRÜNJE (UNIVERSITY OF MÜNSTER, GERMANY), cooperative action of the redox regulators NADPH-dependent MAGDA GRABSZTUNOWICZ (UNIVERSITY OF TURKU, FINLAND), thioredoxin reductase C (NTRC) and thioredoxin (TRX) and explored INES LASSOWSKAT (UNIVERSITY OF MÜNSTER, GERMANY), the coordinated roles of TRX m-type and f-type isoforms as well TRINH V DINH (HEIDELBERG UNIVERSITY, GERMANY), JULIA as of NTRC in the redox control of some enzymes of chlorophyll SINDLINGER (UNIVERSITY OF TÜBINGEN, GERMANY), DIRK biosynthesis in triple and quadruple mutants for these redox SCHWARZER (UNIVERSITY OF TÜBINGEN, GERMANY), MARKUS regulators. In continuation, current results are presented about WIRTZ (HEIDELBERG UNIVERSITY, GERMANY), ESA TYYSTJÄRVI t he t h iol-ba sed redox sw itc hes of t he g luta myl-t R NA reduc ta se (UNIVERSITY OF TURKU, FINLAND), IRIS FINKEMEIER (GluT R), A L A de hyd rata se (A L A D) a nd protopor phy r i nogen ox ida se (UNIVERSITY OF MÜNSTER, GERMANY), PAULA MULO (PPOX) in the pathway. Moreover, we addressed the question to (UNIVERSITY OF TURKU, FINLAND) which extent the dark-dependent inactivation of GluTR by the negative regulator FLU (FLOURESCENT) is based on thiol-disulfide [email protected] exchange reactions. Plants balance the excitation energy distribution between the photosystems II and I (PSII and PSI) in response to constantly changing light. One of the best-studied mechanisms of fine-tuning ANNUAL MEETING SEVILLE 2019 ANIMAL, PLANT & CELL ABSTRACTS 228 ANNUAL MEETING SEVILLE 2019 ANIMAL, PLANT & CELL ABSTRACTS 229 we over-expressed the PTOX in either Eutrema or Arabidopsis, it was seedlings showed aberrant splicing of plastid rRNAs (23S rRNA and P1.6 THE DYNAMIC REGULATION OF inactive. When Eutrema, but not Arabidopsis, oePTOX plants were P1.9 CHLOROPLAST SIGNALS REGULATE 4.5S rRNA) and were deficient in plastid ribosomal proteins. These GRANA SIZE PLAYS A KEY ROLE IN THE salt stressed PTOX activity was induced rapidly and to a greater level STOMATAL DEVELOPMENT resu lt s de mon st rate t hat W H I R LY1 i s requ i red for t he developme nt than in wild type, implying that a co-factor is needed for activity. of fully functional chloroplasts but only at the early stages of OPTIMISATION OF PHOTOSYNTHESIS One paradox in PTOX being a PSII electron sink is that localisation leaf development. TUESDAY 2 JULY, 2019 10:51 st ud ies showed t hese bei ng located i n d i ffe re nt t hyla koid me mbra ne TUESDAY 2 JULY, 2019 10:45 compartments – PSII in the grana stacks, PTOX on the stromal face of t he st roma l la mel lae.