Disclosed are peptides having biological and therapeutic activity. Particularly disclosed are lipidated di- or tri- peptides analogs of KPV or KdPT that exhibit antimicrobial activity. In particular, the peptides of this invention provide enhanced anti-microbial activity over the base tri -peptides, lysine -proline- valine and lysine-d-proline-tyrosine. The disclosed peptides have the general formula of C12-18 lipid— KXZ-NH