Anionic biomolecules and surfaces

Anionic biomolecules and surfaces represent a broad class of negatively charged biological structures that serve as essential components of cells and the extracellular environment. This category includes glycosaminoglycans like heparin, the phosphate backbone of nucleic acids, acidic phospholipids in cell membranes, and various sulfated or carboxylated polysaccharides (PubChem, 2024). These molecules are vital for physiological functions such as the regulation of the coagulation cascade, maintenance of membrane potential, and mediation of cell-cell interactions (NIH, 2023). In pharmacology, these anionic entities are targeted by cationic or ion-exchange drugs that bind through electrostatic attraction. For example, protamine sulfate is a highly cationic peptide employed to neutralize heparin's anticoagulant activity (StatPearls, 2023). Additionally, bile acid sequestrants and phosphate binders, such as sevelamer, remove specific anions from the gastrointestinal tract to treat hyperlipidemia and hyperphosphatemia (Mayo Clinic, 2024). Furthermore, certain antibiotics like polymyxins exploit the anionic nature of bacterial surfaces to achieve selective toxicity, although non-specific binding to host polyanions remains a significant therapeutic challenge (Nature Reviews Microbiology, 2019).

Other names

PolyanionsNegatively charged biomoleculesAnionic cell surfacesAcidic biopolymersNegatively charged biological surfaces

Electrostatic neutralization and sequestration of negatively charged molecules or surfaces to inhibit their biological activity or facilitate their removal.