The cell wall active mannuronan C5-epimerases in the model brown alga Ectocarpus: from gene context to recombinant proteinReportar como inadecuado




The cell wall active mannuronan C5-epimerases in the model brown alga Ectocarpus: from gene context to recombinant protein - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

* Corresponding author 1 LBI2M - Laboratoire de Biologie Intégrative des Modèles Marins 2 DuPont Nutrition and Health 3 SBR - Station biologique de Roscoff Roscoff

Abstract : Mannuronan C5-epimerases ManC5-Es catalyse in brown algae the remodelling of alginate, a major cell wall component which is involved in many biological functions in these organisms. ManC5-Es are present as large multigenic families in brown algae, likely indicating functional specificities and specialisations. ManC5-Es control the distribution pattern of 1-4 linked b-D-mannuronic acid M and a-L-guluronic acid G residues in alginates, giving rise to widely different polysaccharide compositions and sequences, depending on tissue, season, age or algal species. As such they are also a source of powerful new tools for the biotechnological and enzymatic processing of alginates, to match the growing interest for food hydrocolloids and in biomedical and nanotechnological applications. We report here the first heterologous production of a ManC5-E of brown algal origin that is successfully refolded in an active form. The activity was measured by 1H-NMR and by an indirect enzymatic assay using a known bacterial alginate lyase. The transcript expression as a function of the developmental program of the brown alga Ectocarpus, together with the bioinformatic analyses of the corresponding gene context of this multigenic family, are also presented.





Autor: Richard Fischl - Kresten Bertelsen - Fanny Gaillard - Susana Coelho - Markus Klinger - Catherine Boyen - Mirjam Czjzek - Cécile

Fuente: https://hal.archives-ouvertes.fr/



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