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OCPSTRUCTDYNAMICS SIGNED

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

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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.

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

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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