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The Ectocarpus genome and the independent evolution of multicellularity in brown algae
The Ectocarpus genome sequence represents an important step towards developing this organism as a model species, providing the possibility to combine genomic and genetic approaches to explore these and other aspects of brown algal biology further.
Iodine uptake in Laminariales involves extracellular, haloperoxidase-mediated oxidation of iodide
- F. Küpper, N. Schweigert, E. Ar Gall, J. Legendre, H. Vilter, B. Kloareg
- Environmental Science, BiologyPlanta
- 20 November 1998
Hydrogen peroxide and various substances known to interfere with oxidative metabolism were shown to either inhibit or enhance the uptake of iodide, confirming that apoplastic oxidations play a key role in iodide uptake in Laminaria.
Evolution and diversity of plant cell walls: from algae to flowering plants.
- Z. Popper, G. Michel, D. Stengel
- Biology, Environmental ScienceAnnual review of plant biology
- 28 April 2011
In conclusion, organisms that have the shared features of photosynthesis and possession of a cell wall do not form a monophyletic group, yet they contain some common wall components that can be explained increasingly by genetic and biochemical evidence.
The cell wall polysaccharide metabolism of the brown alga Ectocarpus siliculosus. Insights into the evolution of extracellular matrix polysaccharides in Eukaryotes.
Surprisingly, known families of cellulases, expansins and alginate lyases are absent in Ectocarpus, suggesting the existence of novel mechanisms and/or proteins for cell wall expansion in brown algae.
Structure of the cell walls of marine algae and ecophysiological functions of the matrix polysaccharides.
Purification and characterization of the alpha-agarase from Alteromonas agarlyticus (Cataldi) comb. nov., strain GJ1B.
The phenotypic features of strain GJ1B, an unidentified marine bacterium that degrades agar, were investigated and its agarolytic system was characterized using 13C-NMR spectroscopy to analyse the agarose degradation products.
Linear β-1,3 Glucans Are Elicitors of Defense Responses in Tobacco
Structural activity studies showed that the elicitor effects observed in tobacco with β-glucans are specific to linear β-1,3 linkages, with laminaripentaose being the smallest elicitor-active structure.
The kappa-carrageenase of P. carrageenovora features a tunnel-shaped active site: a novel insight in the evolution of Clan-B glycoside hydrolases.
The endo-beta-agarases AgaA and AgaB from the marine bacterium Zobellia galactanivorans: two paralogue enzymes with different molecular organizations and catalytic behaviours.
Two beta-agarase genes, agaA and agaB, were functionally cloned from the marine bacterium Zobellia galactanivorans and it is proposed that, reminiscent of the agarolytic system of Pseudoalteromonas atlantica, AgaA is specialized in the initial attack on solid-phase agarose, while AgaB is involved with the degradation of agarOSE fragments.
Zobellia galactanovorans gen. nov., sp. nov., a marine species of Flavobacteriaceae isolated from a red alga, and classification of [Cytophaga] uliginosa (ZoBell and Upham 1944) Reichenbach 1989 as…
- T. Barbeyron, S. L’Haridon, E. Corre, B. Kloareg, P. Potin
- BiologyInternational journal of systematic and…
- 1 May 2001
A mesophilic, aerobic, non-flagellated, gliding bacterium, forming yellow colonies and designated DsijT, was isolated from a red alga on the sea-shore of Roscoff, Brittany, France, and constituted a new species, distinct from [Cytophaga] uliginosa.