Data/hora: 17/06/2024 15:38:40

Provedor de dados: | 5
País: | France
Título: | Chemical characterization of exopolysaccharides from Antarctic marine bacteria
Autores: | Nichols, Carol; Lardiere, Sandrine; Bowman, John; Nichols, Peter; Gibson, John; Guezennec, Jean.
Data: | 2005-05
Ano: | 2005
Palavras-chave: | Marine particulates; Sea ice; Marine bacteria; Antarctica; Exopolysaccharides.
Resumo: | Exopolysaccharides (EPS) may have an important role in the Antarctic marine environment, possibly acting as ligands for trace metal nutrients such as iron or providing cryoprotection for growth at low temperature and high salinity. Ten bacterial strains, isolated from Southern Ocean particulate material or from sea ice, were characterized. Whole cell fatty acid profiles and 16S rRNA gene sequences showed that the isolates included representatives of the genera Pseudoalteromonas, Shewanella, Polaribacter, and Flavobacterium as well as one strain, which constituted a new bacterial genus in the family Flavobacteriaceae. The isolates are, therefore, members of the "Gammaproteobacteria" and Cytophaga-Flexibacter-Bacteroides, the taxonomic groups that have been shown to dominate polar sea ice and seawater microbial communities. Exopolysaccharides produced by Antarctic isolates were characterized. Chemical composition and molecular weight data revealed that these EPS were very diverse, even among six closely related Pseudoalteromonas isolates. Most of the EPS contained charged uronic acid residues; several also contained sulfate groups. Some strain produced unusually large polymers (molecular weight up to 5.7 MDa) including one strain in which EPS synthesis is stimulated by low temperature. This study represents a first step in the understanding of the role of bacterial EPS in the Antarctic marine environment.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/2005/publication-623.pdf

DOI:10.1007/s00248-004-0093-8

Editor: | Springer
Relação: | http://archimer.ifremer.fr/doc/00000/623/
Formato: | application/pdf
Fonte: | Microbial Ecology (0095-3628) (Springer), 2005-05 , Vol. 49 , N. 4 , P. 578-589
Fonte: | 2005 Springer-Verlag New York, LLC