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Microscopic and Molecular Insights into Heterogeneous Phase Degradation of Agars and Carrageenans by Marine Bacterial Galactanases
Author(s) -
Helbert William,
NyvallCollen Pi,
Michel Gurvan,
Czjzek Mirjam
Publication year - 2005
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200590014
Subject(s) - polysaccharide , cellulose , carrageenan , degradation (telecommunications) , fucoidan , cell wall , chemistry , enzyme , algae , starch , sulfation , chemical engineering , biochemistry , biology , botany , telecommunications , computer science , engineering
Agars and carrageenans are sulfated galactans and are the main matrix component of the cell wall of red algae. They form gels made of a 3D network of fibres built by the aggregation of polysaccharide double‐helices. Agarases and carrageenase are enzymes produced by marine bacteria involved in the conversion of algal biomass. We have analyzed the structures and the modes of action of these enzymes adapted to the degradation of anionic polysaccharides in heterogeneous phase. We found that κ‐ and ι‐carrageenases proceed via an endo‐processive mode of action as it was already described for other enzymes active on neutral polysaccharides (cellulose, starch).