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Jean-Claude Thomas
École Normale Supérieure
38Publications
20H-index
968Citations
Publications 38
Newest
2016
Isabel Canto de Loura1
Estimated H-index: 1
,
Jean Paul Dubacq1
Estimated H-index: 1
,
Jean-Claude Thomas20
Estimated H-index: 20
In contrast to what happens in higher plants and eukaryotic algae, a nitrogen deficiency during growth causes a change in pigment composition but no significant changes in whole cell lipid and fatty acid composition of the two Cyanobacteria, Pseudanabaena sp. (strain M2) and Oscillatoria splendida (strain L3). Nitrogen deficiency does not affect the cellular content in chlorophyll a, but it causes a selective loss in phycobiliproteins; carotenoid content increases with phycocyanin depletion. The...
2009
Nicolas Blot14
Estimated H-index: 14
,
Xian‐Jun Wu3
Estimated H-index: 3
+ 7 AuthorsKai-Hong Zhao16
Estimated H-index: 16
Most cyanobacteria harvest light with large antenna com-plexescalledphycobilisomes.Thediversityoftheirconstitutingphycobiliproteins contributes to optimize the photosyntheticcapacity of these microorganisms. Phycobiliprotein biosynthe-sis, which involves several post-translational modificationsincluding covalent attachment of the linear tetrapyrrole chro-mophores(phycobilins)toapoproteins,beginstobewellunder-stood. However, the biosynthetic pathway to the blue-green-absorbing phycourobilin ( on ...
2009 in PLOS ONEIF: 2.77
Lu-Ning Liu19
Estimated H-index: 19
(Leiden University),
Thijs J. Aartsma34
Estimated H-index: 34
(Leiden University)
+ 2 AuthorsYu-Zhong Zhang30
Estimated H-index: 30
(Shandong University)
Background Phycobilisomes (PBsomes) are the extrinsic antenna complexes upon the photosynthetic membranes in red algae and most cyanobacteria. The PBsomes in the cyanobacteria has been proposed to present high lateral mobility on the thylakoid membrane surface. In contrast, direct measurement of PBsome motility in red algae has been lacking so far. Methodology/Principal Findings In this work, we investigated the dynamics of PBsomes in the unicellular red alga Porphyridium cruentum in vivo and in...
15 Citations Source Cite
Nicolas Blot14
Estimated H-index: 14
,
Xian‐Jun Wu3
Estimated H-index: 3
+ 10 AuthorsLutz A. Eichacker35
Estimated H-index: 35
Abstract Most cyanobacteria harvest light with large antenna complexes called phycobilisomes. The diversity of their constituting phycobiliproteins contributes to optimize the photosynthetic capacity of these microorganisms. Phycobiliprotein biosynthesis, which involves several post-translational modifications including covalent attachment of the linear tetrapyrrole chromophores (phycobilins) to apoproteins, begins to be well understood. However, the biosynthetic pathway to the blue-green-absorb...
51 Citations Download PDF Cite
2008 in PLOS ONEIF: 2.77
Lu-Ning Liu19
Estimated H-index: 19
(Leiden University),
Abdalmohsen T. Elmalk3
Estimated H-index: 3
(Leiden University)
+ 4 AuthorsYu-Zhong Zhang30
Estimated H-index: 30
(Shandong University)
Background Photosynthetic organisms have developed multiple protective mechanisms to prevent photodamage in vivo under high-light conditions. Cyanobacteria and red algae use phycobilisomes (PBsomes) as their major light-harvesting antennae complexes. The orange carotenoid protein in some cyanobacteria has been demonstrated to play roles in the photoprotective mechanism. The PBsome-itself-related energy dissipation mechanism is still unclear. Methodology/Principal Findings Here, single-molecule s...
32 Citations Source Cite
Lu-Ning Liu19
Estimated H-index: 19
,
Thijs J. Aartsma34
Estimated H-index: 34
+ 3 AuthorsYu-Zhong Zhang30
Estimated H-index: 30
The architecture of the entire photosynthetic membrane network determines, at the supramolecular level, the physiological roles of the photosynthetic protein complexes involved. So far, a precise picture of the native configuration of red algal thylakoids is still lacking. In this work, we investigated the supramolecular architectures of phycobilisomes (PBsomes) and native thylakoid membranes from the unicellular red alga Porphyridium cruentum using atomic force microscopy (AFM) and transmission...
22 Citations Source Cite
2007 in Current MicrobiologyIF: 1.37
Gérald Zabulon13
Estimated H-index: 13
(École Normale Supérieure),
Catherine Richaud6
Estimated H-index: 6
(École Normale Supérieure)
+ 1 AuthorsJean-Claude Thomas20
Estimated H-index: 20
(École Normale Supérieure)
Cyanobacteria respond to nutrient-limiting conditions by degrading their phycobilisomes (PBS), the light-harvesting complexes for photosynthesis. In Synechococcus sp. PCC 7942, the expression of nblA, an essential gene in this process, is controlled by the response regulator NblR and the sensor NblS. Here we study the effect of inactivation of dspA (an nblS homologue) and an nblR-like gene on phycobilisome degradation in Synechocystis sp. PCC 6803, under nitrogen starvation. In each mutant, the ...
14 Citations Source Cite
2007 in Genome BiologyIF: 13.21
Christophe Six9
Estimated H-index: 9
(University of Paris),
Jean-Claude Thomas20
Estimated H-index: 20
(École Normale Supérieure)
+ 5 AuthorsFrédéric Partensky48
Estimated H-index: 48
(University of Paris)
Background: Marine Synechococcus owe their specific vivid color (ranging from blue-green to orange) to their large extrinsic antenna complexes called phycobilisomes, comprising a central allophycocyanin core and rods of variable phycobiliprotein composition. Three major pigment types can be defined depending on the major phycobiliprotein found in the rods (phycocyanin, phycoerythrin I or phycoerythrin II). Among strains containing both phycoerythrins I and II, four subtypes can be distinguished ...
133 Citations Download PDF Cite
2006 in Journal of BacteriologyIF: 3.22
Craig Everroad1
Estimated H-index: 1
(University of Oregon),
Christophe Six9
Estimated H-index: 9
(Centre national de la recherche scientifique)
+ 3 AuthorsA. Michelle Wood17
Estimated H-index: 17
(University of Oregon)
Chromatic adaptation (CA) in cyanobacteria has provided a model system for the study of the environmental control of photophysiology for several decades. All forms of CA that have been examined so far (types II and III) involve changes in the relative contents of phycoerythrin (PE) and/or phycocyanin when cells are shifted from red to green light and vice versa. However, the chromophore compositions of these polypeptides are not altered. Some marine Synechococcus species strains, which possess t...
61 Citations Download PDF Cite
2005 in Journal of BacteriologyIF: 3.22
Christophe Six5
Estimated H-index: 5
(Pierre-and-Marie-Curie University),
Jean-Claude Thomas20
Estimated H-index: 20
(École Normale Supérieure)
+ 3 AuthorsFrédéric Partensky48
Estimated H-index: 48
(Pierre-and-Marie-Curie University)
The recent availability of the whole genome of Synechococcus sp. strain WH8102 allows us to have a global view of the complex structure of the phycobilisomes of this marine picocyanobacterium. Genomic analyses revealed several new characteristics of these phycobilisomes, consisting of an allophycocyanin core and rods made of one type of phycocyanin and two types of phycoerythrins (I and II). Although the allophycocyanin appears to be similar to that found commonly in freshwater cyanobacteria, th...
39 Citations Download PDF Cite
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