A Novel Amphipathic Linear Peptide with Both Insect Toxicity and Antimicrobial Activity from the Venom of the Scorpion Isometrus maculatus

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Abstract

Scorpion venoms are composed of a number of peptides, many of which show neurotoxicity. In addition to these neurotoxins, several antimicrobial peptides have also been isolated from the venoms. The scorpion <I>Isometrus maculatus</I>, belonging to the Buthidae family, is found in many tropical regions including Japan, but little attention has been paid to its biological activity and chemical composition. In this study, we isolated a novel insect toxin, Im-1, by bioassay-guided fractionation of the venom of <I>I. maculatus</I>. Rapid and reversible paralysis was observed after injection of Im-1 into crickets. Im-1 consists of 56 amino acids, and is predicted to form an amphipathic α-helix. Since Im-1 shares sequence similarity to an antimicrobial peptide, parabutoporin, we evaluated its effects on several bacterial strains and found that it showed an antimicrobial activity profile similar to parabutoporin. This suggests that Im-1 and parabutoporin exert their antimicrobial effects through similar mechanisms.

Journal

Bioscience, Biotechnology, and Biochemistry  

Bioscience, Biotechnology, and Biochemistry 74(2), 364-369, 2010-02-23 

Japan Society for Bioscience, Biotechnology, and Agrochemistry

References:  24

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Codes

  • NII Article ID (NAID) :
    10027551635
  • NII NACSIS-CAT ID (NCID) :
    AA10824164
  • Text Lang :
    ENG
  • Article Type :
    Journal Article
  • ISSN :
    09168451
  • NDL Article ID :
    10580021
  • NDL Source Classification :
    ZR7(科学技術--農林水産--農産) // ZR2(科学技術--生物学--生化学) // ZP1(科学技術--化学・化学工業)
  • NDL Call No. :
    Z53-G223
  • Databases :
    CJP  CJPref  NDL  J-STAGE