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<p>Exopolysaccharides (EPS), an important high molecular weight polymeric substance of the microbial group having great bio prospects in uplifting a sustainable environment. Cyanobacteria is one of the potent microbial candidates that form EPS on their cell surfaces and possess numerous negatively charged proton-active functional groups such as carboxyl, hydroxyl, sulfate, phosphate having strong metal chelating&#xa0;properties. These members have recently emerged as viable options for long-term bioremediation due to their propensity to produce variable monosaccharide groups which directly lead to impact on biosorption efficacy. However, the sugar compositions of Fructose, Fucose, Galactose, Glucose, Mannose, Rhamnose, Ribose, Xylose, and Arabinose may vary&#xa0;within the species and strains, which could directly impact on the metal complexation and influence the binding stoichiometry. Transcriptome and proteome analysis combined with high-throughput screening can more accurately identify high-yielding EPS producers like <i>Synechocystis</i> sp. PCC 6803, and <i>Cyanothece</i> sp. CCY 0110. These properties can either be enhanced by adopting recent genetic engineering techniques or through growth manipulation of metallothionein protein, glycosyl transferase gene, ABC transporter and P-type ATP family can&#xa0;easily elevate the cellular polysaccharide ultrastructure by creating varied degrees of hostile abiotic conditions. Targeting the promoter sequence particularly arsB and nrsB could also provide some novel insight on various ecotechnological applications including heavy metal sensing and mitigation. These polymeric substances can now be utilized in the industrial sector by separating the compound from the cell surface using long-established extraction strategies like alcoholic precipitation and tangential ultrafiltration&#xa0;for desired polysaccharide products.</p> Graphical Abstract <p></p>

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Harnessing Cyanobacterial Exopolysaccharides for Metal Biosorption: Ultrastructure, Stress Responses and Extraction Approaches

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Nilamjyoti Kalita,
  • Priyakshi Hazarika,
  • Partha Pratim Baruah

摘要

Exopolysaccharides (EPS), an important high molecular weight polymeric substance of the microbial group having great bio prospects in uplifting a sustainable environment. Cyanobacteria is one of the potent microbial candidates that form EPS on their cell surfaces and possess numerous negatively charged proton-active functional groups such as carboxyl, hydroxyl, sulfate, phosphate having strong metal chelating properties. These members have recently emerged as viable options for long-term bioremediation due to their propensity to produce variable monosaccharide groups which directly lead to impact on biosorption efficacy. However, the sugar compositions of Fructose, Fucose, Galactose, Glucose, Mannose, Rhamnose, Ribose, Xylose, and Arabinose may vary within the species and strains, which could directly impact on the metal complexation and influence the binding stoichiometry. Transcriptome and proteome analysis combined with high-throughput screening can more accurately identify high-yielding EPS producers like Synechocystis sp. PCC 6803, and Cyanothece sp. CCY 0110. These properties can either be enhanced by adopting recent genetic engineering techniques or through growth manipulation of metallothionein protein, glycosyl transferase gene, ABC transporter and P-type ATP family can easily elevate the cellular polysaccharide ultrastructure by creating varied degrees of hostile abiotic conditions. Targeting the promoter sequence particularly arsB and nrsB could also provide some novel insight on various ecotechnological applications including heavy metal sensing and mitigation. These polymeric substances can now be utilized in the industrial sector by separating the compound from the cell surface using long-established extraction strategies like alcoholic precipitation and tangential ultrafiltration for desired polysaccharide products.

Graphical Abstract