Gageostatin A is an antimicrobial peptide (AMP) isolated from a marine strain of Bacillus subtilis. Gageostatin A is a linear lipopeptide composed of 7 peptides, and has shown initial bioactivity against pathogenic fungi, Gram-positive and Gram-negative bacteria, and cancer cell lines. Lipopeptides are nonribosomal oligopeptides made by large multienzyme complex and have a cyclic structure including β-amino or β-hydroyxl fatty acid that is integrated into the peptide moiety.