Exopolysaccharide biosynthesis and biodegradation by a marine hydrothermal Alteromonas sp. strain

Type Article
Date 2015-03
Language English
Author(s) Lelchat Florian1, 2, Cozien Joelle1, 2, Le Costaouec Tinaig3, Brandily Christophe1, 2, Schmitt Sophie1, 2, Baudoux Anne-Claire4, Colliec-Jouault SylviaORCID1, 2, Boisset Claire1, 2, 3
Affiliation(s) 1 : IFREMER, F-29280 Plouzane, France.
2 : IFREMER, F-44311 Nantes 3, France.
3 : CERMAV, F-38049 Grenoble 9, France.
4 : CNRS, Stn Biol Roscoff, F-29680 Roscoff, France.
Source Applied Microbiology And Biotechnology (0175-7598) (Springer), 2015-03 , Vol. 99 , N. 6 , P. 2637-2647
DOI 10.1007/s00253-014-6075-y
WOS© Times Cited 17
Keyword(s) Marine Alteromonas macleodii sp strain, Bacterial exopolysaccharides, Microbial extracellular enzymes, Endogenous enzymatic degradation
Abstract Alteromonas macleodii subsp. fijiensis biovar deepsane is a deep-sea ecotype exopolysaccharide-producing bacteria isolated from the polychaete annelid Alvinella pompejana. The high molecular weight biopolymer HYD657 produced by this strain, is the first marine exopolysaccharide (EPS) to be commercialized for cosmetic use. Depolymerization methods are necessary to elucidate the complete structure of this EPS and to generate potentially bioactive oligosaccharides. Enzymatic methods are useful for elucidating polysaccharide structure because they specifically cleave glycosidic bonds and do not require harsh chemical conditions. The HYD657 EPS is structurally complex and no commercially available enzymes are able to effectively degrade it. Here, we present the first results on the endogenous enzymatic depolymerization of a marine EPS of biotechnological interest by the producing strain. Enzymatic activity was detected in the bacterial lysate and was able to decrease the apparent molecular size of the EPS, releasing mainly oligosaccharides. The reduced form of the native polysaccharide showed a slightly modified osidic composition, particularly in terms of molar ratio. Several exoglycosidase activities were measured in the bacterial lysate using paranitrophenyl-osides
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Lelchat Florian, Cozien Joelle, Le Costaouec Tinaig, Brandily Christophe, Schmitt Sophie, Baudoux Anne-Claire, Colliec-Jouault Sylvia, Boisset Claire (2015). Exopolysaccharide biosynthesis and biodegradation by a marine hydrothermal Alteromonas sp. strain. Applied Microbiology And Biotechnology, 99(6), 2637-2647. Publisher's official version : https://doi.org/10.1007/s00253-014-6075-y , Open Access version : https://archimer.ifremer.fr/doc/00240/35129/