The production of EPS (9.1 ± 0.05 μg/ml) and increase in cell dry weight (1.01 ± 0.06 g/l) were comparatively high in Nostoc sp. FB71 was isolated from different habitats and thenthe results were compared and reported.Ĭultures of both strains, supplemented separately with either glucose, sucrose, lactose, or maltose showed that production of EPS and cell dry weight were boosted by maltose supplementation. Here, extracellular polymeric substances (EPS) production in strains Nostoc sp. Recently, most studies have been focused on different habitats using microalgae leads to a remarkable reduction of an array of organic and inorganic nutrients, but what takes place in the extracellular environment when cells are exposed to external supplementation with heavy metals remains largely unknown. As their photosynthetic machinery imposes high demands for metals, homeostasis of these micronutrients has been extensively considered in cyanobacteria. The data gathered here provide a first insight on the phylogenetic history of the EPS-related genes, and constitute a robust basis for subsequent studies aiming to optimize EPS production in cyanobacteria.Ĭyanobacteria are ecologically significant prokaryotes that can be found in heavy metals contaminated environments. However, it is necessary to identify other genes that may be related to this process, understand their genomic distribution, and reconstruct their evolutionary history. Our previous studies revealed that in cyanobacteria, the genes encoding these proteins occur in multiple copies, scattered throughout the genome, either isolated or in small clusters. Studies performed in other bacteria revealed that the mechanisms of EPS assembly and export are relatively conserved, generally following the Wzy-dependent or the ABC-dependent pathways, which require the involvement of polysaccharide copolymerase (PCP) and outer membrane polysaccharide export (OPX) proteins. Despite the increasing interest in these polymers, the information about their biosynthetic pathways is still limited. The particular characteristics of these EPS, such as the presence of two different uronic acids, sulphate groups and high number of different monosaccharides (up to 13), make them very promising for biotechnological applications.
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