The invention discloses a self-assembled nano-capture
antibacterial peptide KIL4 and a preparation method and application thereof, and belongs to the technical field of
biology, and the
amino acid sequence is shown as SEQ ID No.1. The preparation method comprises the following steps: adopting an alpha-spiral heptapeptide
repetitive sequence (abcdefg) 4 template, and selecting
lysine to provide positive charges at positions b and c;
isoleucine and
leucine are respectively filled to a position a and a position d to provide intermolecular hydrophobic force, and
lysine and
glutamic acid are selected to be respectively filled to a position e and a position g to provide intermolecular electrostatic force; the position f of the center of the hydrophilic surface of the polypeptide is filled with
tryptophan to optimize the hydrophobicity of the polypeptide, on the basis, the sequence is repeated for four times, and the invention further discloses application of the polypeptide in preparation of drugs for treating
gram-positive
bacteria or / and
gram-negative
bacteria infectious diseases. The
antibacterial peptide disclosed by the invention has dual effects of resisting
bacteria and capturing bacteria, has excellent
biocompatibility, and provides an effective
technical support for developing novel antibacterial drugs.