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In our previous study, we reported that urechistachykinin I (U I) and II (U II) exerted antimicrobial effects. To find out how the tachykinin consensus sequence of the urechistachykinin peptide family affects its antimicrobial activity, analogues substituting the amino acid residues phenylalanine (Phe-6; Anal 1), glycine (Gly-8; Anal 2), and arginine (Arg-10; Anal 3) of U II to alanine (Ala) were designed. Subsequently, the antimicrobial activity was shown on the order of Anal 3&gt;U II=Anal 2&gt;Anal 1, and this activity pattern was correlated with membrane studies such as propidium iodide (PI) influx and fluorescein isothiocyanate dextran (FD) leakage assay. These results suggest that the antimicrobial activity is related to the hydrophobicity values of the peptides. In regards to the activity of U II, it is determined that the hydrophobic Phe-6 plays a more critical role than Gly-8 or Arg-10.

The Functional Role of the Tachykinin Consensus Region of Urechistachykinin Peptide Family for Its Antimicrobial Activity