Correlation between sporogenesis and lipopeptide production in Paenibacillus elgii.

This article focuses on optimizing the production of antimicrobial lipopeptides pelgipeptins and tridecaptins by the bacterium *Paenibacillus elgii* AC13 using chemically defined media. The study found that removing calcium ions (Ca²⁺) from the culture medium interrupted sporogenesis (spore formation) in *P. elgii* AC13 and significantly increased pelgipeptin yield in both the supernatant and cell fraction, while tridecaptin production remained largely cell-associated and unaffected by calcium absence. These findings suggest that pelgipeptin production is inversely related to spore formation, enhancing its potential for commercial antimicrobial applications, whereas tridecaptins may be degraded or bound to cell debris, complicating their recovery. The use of chemically defined media with specific nutrient modifications improved pelgipeptin yields compared to complex media, offering a more efficient approach for biotechnological exploitation of these antimicrobial peptides.