Cationic antimicrobial peptide potently active against Gram-positive and Gram-negative bacteria including multi-resistant human pathogenic strains. Is not active against the Gram-positive Coccus species, Gram-negative non-fermentation species and against the fungus C.albicans. It leads to aggregation of bacteria as an initial step of its bactericidal mechanism. Aggregated cells are connected via electron-dense contacts and adopt a thorn apple-like morphology. Hydramycin contains a belt of positively charged residues that separate two hydrophobic areas. This structure may explain the observed aggregation of bacteria, since each of these areas can immerse into the outer leaflets of the membranes of two individual bacteria. Is able to permeabilize membranes of viable bacteria at low and neutral pH values, but no pore-forming activity is not detected. Expressed in the endodermal epithelium. By bacterial lipopolysaccharides (LPS). Belongs to the macin family.