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OCPSTRUCTDYNAMICS SIGNED

Structural dynamics essential for photosynthetic adaptation and survival of cyanobacteria in fluctuating light intensities

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EC-Contrib. €

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Partnership

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 OCPSTRUCTDYNAMICS project word cloud

Explore the words cloud of the OCPSTRUCTDYNAMICS project. It provides you a very rough idea of what is the project "OCPSTRUCTDYNAMICS" about.

dependent    describe    isolated    ocpx    ocp1    cyanobacteria    heat    genomes    proteins    activation    diffraction    suggested    date    protect    first    spectroscopic    vulnerable    transitions    additional    slr1963    dissociation    transient    domains    photoprotection    raised    allowed    fluctuations    subfamilies    quenching    photosynthetic    structural    ocp    artificial    unravelled    triggered    machinery    crystallography    harvesting    movement    biofuel    oriented    differences    questions    light    synechocystis    excess    encoded    6803    flow    absorption    protein    absorbed    resolve    ocp2    intensity    mechanisms    ray    resolved    photochemical    orange    carotenoid    npq    demonstrating    ultrafast    paralogs    crystals    structure    damage    mechanism    kinetics    terminal    identification    photo    interactions    like    occurs    photoenergy    gene    optogenetics    dynamics    dissipation    themselves    cyanobacterial    time    photosynthesis    causing    combined    ranging    spectroscopy    single    exact    roles    polarised    photoprotective    photoactivation    energy    organisms    performed   

Project "OCPSTRUCTDYNAMICS" data sheet

The following table provides information about the project.

Coordinator		 IMPERIAL COLLEGE OF SCIENCE TECHNOLOGY AND MEDICINE 

Organization address
address: SOUTH KENSINGTON CAMPUS EXHIBITION ROAD
city: LONDON
postcode: SW7 2AZ
website: http://www.imperial.ac.uk/

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.
 Coordinator Country United Kingdom [UK]
 Total cost 212˙933 €
 EC max contribution 212˙933 € (100%)
 Programme 1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
 Code Call H2020-MSCA-IF-2018
 Funding Scheme MSCA-IF-EF-ST
 Starting year 2020
 Duration (year-month-day) from 2020-01-08   to  2022-01-07

 Partnership

Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 
1    IMPERIAL COLLEGE OF SCIENCE TECHNOLOGY AND MEDICINE UK (LONDON) coordinator 212˙933.00

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 Project objective

Like most photosynthetic organisms, cyanobacteria are vulnerable to fluctuations in light intensity, which can damage their photosynthetic machinery. To protect themselves against such fluctuations, they use a photoprotective mechanism called non-photochemical quenching (NPQ), i.e. the dissipation of excess absorbed photo-energy as heat. NPQ in cyanobacteria is triggered by orange carotenoid protein (OCP) light activation. Based on spectroscopic and diffraction studies of OCP in Synechocystis 6803 (gene slr1963), it was suggested that OCP light activation occurs through light-induced movement of a carotenoid causing movement and/or dissociation of OCP N- and C-terminal domains. However, the exact structural dynamics of OCP light-activation need to be unravelled. Furthermore, the growing availability of cyanobacterial genomes allowed identification of additional OCP subfamilies (OCP2, OCPX) in different cyanobacteria. The first results demonstrating different kinetics of light-activation in the different OCP paralogs raised questions about differences in their photoprotective roles and in photoactivation mechanisms. This topic has not been studied to date. Here I propose to resolve structural changes during photoprotection-related transitions of OCP in different OCP subfamilies using time-resolved X-ray crystallography. X-ray crystallography of OCP1 encoded by slr1963, the best-characterized OCP protein, as well as its paralogs from the OCP2 and OCPX subfamilies will be performed. This approach will be combined with ultrafast transient (polarised) absorption spectroscopy on isolated proteins and oriented single crystals to describe the structure-dependent flow of photoenergy in the proteins. This study has several potential applications ranging from enhancing cyanobacterial light harvesting to improve biofuel production, to better understanding of carotenoid-protein interactions in artificial photosynthesis systems, and for optogenetics.

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