This present invention provides a novel peptide for inhibiting growth of microorganisms, a pharmaceutical composition, an antimicrobial composition comprising such novel peptide, and a method for inhibiting growth of microorganisms. The novel peptide for inhibiting growth of microorganisms has amino acid sequence: KX1LRX2X3X4RRWX5, wherein X1, X2, and X5 are selected from the group of W and R, respectively X3 is selected from the group of V and P and X4 is selected from the group of R and methylated W. The method for inhibiting growth of microorganisms disclosed in this present invention comprises administering the novel peptide, the pharmaceutical composition, or the antimicrobial composition.
