Characterization of a Sinorhizobium Isolate and Its Extracellular Polymer Implicated in Pollutant Transport in Soil
AUTOR(ES)
Janecka, J.
FONTE
American Society for Microbiology
RESUMO
A bacterium isolated from soil (designated 9702-M4) synthesizes an extracellular polymer that facilitates the transport of such hydrophobic pollutants as polynuclear aromatic hydrocarbons, as well as the toxic metals lead and cadmium in soil. Biolog analysis, growth rate determinations, and percent G+C content identify 9702-M4 as a strain of Sinorhizobium meliloti. Sequence analysis of a 16S rDNA fragment gives 9702-M4 a phylogenetic designation most closely related to Sinorhizobium fredii. The extracellular polymer of isolate 9702-M4 is composed of both an extracellular polysaccharide (EPS) and a rough lipopolysaccharide. The EPS component is composed mainly of 4-glucose linkages with monomers of galactose, mannose, and glucuronic acid and has pyruval and acetyl constituents. The lipid fraction and the negative charge associated with carbonyl groups of the exopolymer are thought to account for the binding of polynuclear aromatic hydrocarbons and cationic metals.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=126573Documentos Relacionados
- Identification of a Marine Agarolytic Pseudoalteromonas Isolate and Characterization of Its Extracellular Agarase
- Purification and Characterization of an Extracellular Poly(l-Lactic Acid) Depolymerase from a Soil Isolate, Amycolatopsis sp. Strain K104-1
- Characterization of a GTP-binding protein implicated in both memory storage and interorganelle vesicle transport.
- Pollutant transport in a Convective Boundary Layer with LES
- Degradation and mineralization of atrazine by a soil bacterial isolate.